JP2009230200A - Chaos laser oscillator, super-high speed physical random number generation device using the same and its method and its program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily generate true random numbers at a speed which is 1G bits or more per second. <P>SOLUTION: This super-high speed physical random number generation device is provided with: a first laser oscillation part and a second laser oscillation part configured of a chaos oscillator set in a chaos oscillation state in which the output light intensity signal of a composite resonance laser irregularly vibrates; first and second light detection parts for converting the output light intensity signals of the first and second laser oscillation parts into AC electric signals; a cyclic clock generation part for generating a cyclic clock; first and second threshold processing parts for converting the AC electric signals to be output from the first and second light detection parts into binary signals in the timing of a cyclic clock; and an exclusive logical sum calculation means for calculating the exclusive logical sum of the binary signals to be output by the first threshold processing part and the second threshold processing parts. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chaotic laser oscillator for generating, for example, a real random number required for a cryptographic field or a large-scale numerical calculation at high speed, an ultrafast physical random number generator using the same, a method thereof, and a program thereof And the recording medium.

  As a method for generating a true random number, there are a method using a natural decay phenomenon of a nucleus (see Patent Document 1), a method using a thermal noise of a semiconductor (see Patent Document 2), and the like. Any of these methods can generate a good uniform random number, but the generation speed of the random number is as low as 40 to 1000 cps (cycle / second), for example.

  An example of the functional configuration of a conventional ultrahigh-speed physical random number generator that generates random numbers at high speed is shown in FIG. 38 and its operation will be briefly described (see Patent Document 3). A conventional ultra-high speed physical random number generator 380 includes a random pulse generating element 1 for generating random numbers, a preamplifier 3 of a first circuit, a main amplifier 4, a pulse height discriminator 5, a waveform shaper 6, A pre-amplifier 23 of two circuits, a main amplifier 24, a pulse height discriminator 25, a waveform shaper 26, and a common 1-bit random number generator 7, and a switching random pulse generating element 2; A preamplifier 3, a main amplifier 4, a wave height discriminator 5, a waveform shaper 6 and an address converter 8 are provided.

  The random pulse generating element 1 includes a light emitting diode (hereinafter referred to as “LED”) light source 11, two avalanche PTN diodes 12 and a breeding PIN diode 13 for generating random numbers. In the switching random pulse generating element 2, one light source 14 and one PIN diode 15 are integrated.

Photon masses from one LED light source 11 alternatively enter the breeding PIN diode 12 or the breeding PIN diode 13 at random. The low-power electric mass generated by the breeding-type PIN diodes 12 and 13 is multiplied by 100 times in each breeding-type PTN diode 12 and 13 itself, and then the preamplifiers 3 and 23 and the main amplifiers 4 and 24. Is further amplified into a voltage signal of several volts. The voltage signals from the main amplifiers 4 and 24 are separated from noise by the wave height discriminators 5 and 25, and become rectangular pulse signals by the waveform shapers 6 and 26. This rectangular pulse signal is input to a 1-bit random number generator 7 to generate a 1-bit random number. The generation speed of the 1-bit random number is 10M to 100M bits per second.
JP-A-11-184676 JP 2001-75782 A JP 2000-276329 A (FIG. 1)

  However, in the method disclosed in Patent Document 3, in order to generate a high-speed pulse by detecting a photon mass of 10 7 or more from the LED light source 11 per second, the breeding PIN diodes 12 and 13 that can operate at high speed are used. Need. However, it is difficult to detect the photon mass only by using a general breeding PIN diode. For example, special measures such as cooling the photodiode are required. As described above, in the prior art, for example, a method and a generation apparatus for generating a physical random number at a rate of 1 Gbit / second or more required in the encryption field cannot be easily realized. The maximum speed was about 100 Mbit / s.

  The present invention has been made in view of these points, and a chaotic laser oscillator used to easily generate a true random number at a speed of 1 Gbit / second or more, and an ultrafast physical random number generation using the chaotic laser oscillator An object is to provide an apparatus, a method thereof, a program, and a recording medium.

  The chaotic laser oscillator according to the present invention is a composite resonance laser including a laser, an injection current control unit for controlling the injection current of the laser, and an external resonator including an external mirror and an optical filter. Then, the external resonance frequency corresponding to the reciprocal of the round-trip time of light in the external resonator is set to a non-integer ratio with respect to the clock frequency for generating a binary random number. Further, the center frequency of the output light intensity signal of the composite resonant laser is set to a clock frequency or higher and a non-integer ratio with respect to the clock frequency. Also, the amplitude level of the RF spectrum of the output light intensity signal of the composite resonance laser is set to 25 dB or less of the amplitude adjustment width, and the chaotic oscillation state in which the output light intensity signal of the composite resonance laser oscillates irregularly is set. The

  In addition, an ultrahigh-speed physical random number generator of the present invention includes a laser oscillation unit composed of the above chaotic laser oscillator, a light detection unit, a periodic clock generation unit, and a threshold processing unit. The light detection unit converts the output light intensity signal of the laser oscillation unit into an AC electrical signal. The periodic clock generator generates a periodic clock. The threshold processing unit converts the AC electrical signal output from the light detection unit into a binary random number signal at the timing of the periodic clock.

  The chaotic laser oscillator of the present invention outputs a complex resonant laser in a chaotic oscillation state in which the output light intensity signal oscillates irregularly. In addition, the ultrahigh-speed physical random number generation device of the present invention generates ultrahigh-speed physical random numbers from 1 Gbit to 100 Gbit per second by using a complex resonant laser in a chaotic state generated by a chaotic laser oscillator as a random number signal source. enable. The configuration is simple, and an ultra-high speed physical random number generator that easily generates a binary random number signal at a speed of 1 Gbit / s or more can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals are given to the same components in a plurality of drawings, and the description will not be repeated.

  FIG. 1 shows an example of the functional configuration of a chaos laser oscillator 100 that is an example of the chaos laser oscillator of the present invention. The chaos laser oscillator 100 includes an external resonance including a laser 101, an injection current control unit 102, a lens 103, a beam splitter (hereinafter referred to as “BS”) 104, an optical attenuation filter 105, and an external mirror 106. And a compound resonant laser.

  The output light intensity signal of the composite resonant laser is divided by the BS 104, injected into a fiber coupler (Fiber Coupler, hereinafter referred to as “FC”) 109 through an isolator (hereinafter referred to as “ISO”) 107, and output to the outside. The configuration of the chaotic laser oscillator 100 is not different from that of a conventional composite resonant laser. The chaos laser oscillator 100 is characterized by the setting conditions of the injection current control unit 102, the external resonator 108, and the optical attenuation filter 105 for generating the output light intensity signal of the composite resonance laser.

  The condition setting method will be described with reference to FIG. First, a clock frequency for generating a binary random number is set (step S503). Details of the clock frequency will be described later. Next, the injection current control unit 102 is adjusted to set the center frequency of the output light intensity signal to be higher than the clock frequency (step S102). The center frequency of the output light intensity signal is desirably set higher than the clock frequency within the range allowed by the injection current and within the range where chaos generation can be realized.

  Next, the reflecting mirror 106 is installed so that there is return light, and the external resonance frequency corresponding to the reciprocal of the round-trip time of light in the external resonator 108 is set to a non-integer ratio with respect to the clock frequency. (Step S108). An example of the RF spectrum of the output light intensity signal set in this way is shown in FIG. RF is an abbreviation for Radio Frequency, corresponds to the frequency component of the output light intensity signal, and means different from the optical frequency. The horizontal axis of Fig.3 (a) is frequency [GHz], and a vertical axis | shaft is power [dBm]. The output light intensity signal is a signal in which an RF spectrum of an external resonance frequency of about 75 MHz with 2.62 GHz as the center frequency is superimposed. This characteristic was obtained using an optical communication DFB semiconductor laser (model number NLK1555CCA) under the conditions of an injection current value of 12.0 mA and an external resonator length of 2.0 m.

  FIG. 3B is an enlarged view of FIG. The relationship between the horizontal axis and the vertical axis is the same as in FIG. The RF spectrum of the external resonance frequency generated at intervals of about 75 MHz can be confirmed. The result of observing the output light intensity signal on the time axis is shown in FIG. The horizontal axis is time [ns], and the vertical axis is intensity. It can be seen that the intensity of the output light intensity signal is chaotically oscillating. FIG. 3D shows the result of calculating the change of the autocorrelation coefficient with reference to a certain time of the chaotic time oscillation waveform. The horizontal axis is the delay time [ns] based on a certain time, and the vertical axis is the value of the autocorrelation coefficient. 0 indicates no correlation, 1 indicates complete correlation (the same waveform), and -1 indicates a waveform whose phase is inverted. The characteristic is that the autocorrelation coefficient of the delay time 0.38 ns corresponding to the center frequency 2.62 GHz of the output light intensity signal and the delay time 13.3 ns corresponding to the external resonance frequency 75 MHz becomes large.

  Here, considering that the characteristic shown in FIG. 3D is used to generate a random number in the time axis direction, if the value of the autocorrelation coefficient in the time interval for generating the random number is 0 (no correlation). I understand that That is, for example, when generating a 1 Gbit binary random number per second, it is the same as looking at the autocorrelation coefficient of FIG. Therefore, when the external resonance frequency is set to a value that is a non-integer multiple of the clock frequency, the clock frequency and the timing at which the autocorrelation coefficient increases are more difficult to synchronize, and an uncorrelated random number can be realized. Also, the relationship between the center frequency and the clock frequency should be set to a non-integer multiple relationship for the same reason.

  Since the magnitude of the RF spectrum amplitude of the output light intensity signal determined by the external resonance frequency affects the quality of the binary random number, the relationship between the RF spectrum amplitude and the random number quality was examined. FIG. 4 shows the result of changing the amplitude of the RF spectrum of the output light intensity signal by the optical attenuation filter 105. The horizontal axis in FIG. 4 is the frequency [GHz], and the vertical axis is the RF spectrum power [dBm]. 4A shows the output light intensity signal when the transmittance of the optical attenuation filter 105 is 26.8%, FIG. 4B is 33.4%, and FIG. 4C is 41.6%. RF spectrum. In this way, the amplitude of the RF spectrum was varied, a binary random number sequence was generated by an ultra-high speed physical random number generator of Example 3 described later, and the random number was subjected to a random number test. For the random number test, NIST SP800-22 proposed by the National Institute of Standards and Technology was used.

NIST SP800-22の試験項目は全部で１５項目ある。合格数が多いほど乱数の品質が良いことを意味する。表１に示すＮＩＳＴ合格数は、総じて少ないが、ここでは透過率に対する合格数の変化に注目する。透過率が２６.８％と３３.４％の間で合格数がやや大きく変化する傾向が見て取れる。これをＲＦスペクトルの振幅で見ると４２ｄＢと２４.３ｄＢの間である。このことから出力光強度信号のＲＦスペクトルの振幅を、２５ｄＢ以下に設定すればより良い品質の乱数が得られることが分かる。ｄＢ値は、ＲＦスペクトルの調整幅の最大振幅に対する値である。 Table 1 shows the results of the random number test.

There are 15 NIST SP800-22 test items. The higher the number of passes, the better the quality of the random number. The number of NIST acceptances shown in Table 1 is generally small, but attention is paid to the change in the number of acceptances with respect to the transmittance. It can be seen that the number of acceptances slightly changes between 26.8% and 33.4%. This is between 42 dB and 24.3 dB in terms of the amplitude of the RF spectrum. From this, it can be seen that better quality random numbers can be obtained if the amplitude of the RF spectrum of the output light intensity signal is set to 25 dB or less. The dB value is a value for the maximum amplitude of the adjustment width of the RF spectrum.

  As described above, the chaotic laser oscillator shown in the first embodiment can be used as a random number generation source of an ultrahigh-speed physical random number generator that generates binary random numbers at an ultrahigh speed, as will be described in detail later.

  Another embodiment of a chaotic laser oscillator for generating a random number at a higher speed is shown in FIG. The chaotic laser oscillator 500 includes the first laser 501 and the second laser 502 that are the chaotic laser oscillators described in the first embodiment, and temperature controllers 503 and 504 that control the temperatures of the first laser 501 and the second laser 502, respectively. An output light intensity signal 501 is injected, and an output light intensity signal of the second laser is output to the outside. The output light intensity signal of the first laser 501 is injected into the second laser 502 through the ISO 501a and the BS 502a. The temperature control unit 503 controls the temperature of the first laser 501 and the temperature control unit 504 controls the temperature of the second laser 502 with a resolution accuracy of about 0.01 ° C., for example, to stabilize the wavelength.

  Each of the first laser 501 and the second laser 502 is set by the method described in the first embodiment. In addition, the relationship between the two is set as follows. The condition setting flow will be described with reference to FIG. The external resonance frequency of the first laser 501 and the second laser 502 is set to a non-integer ratio (step S60). The reason for setting the non-integer ratio is to make it difficult to synchronize the clock frequency with the timing when the autocorrelation coefficient increases. The external resonance frequency of the first laser 501 is set to 107 MHz, for example, and that of the second laser 502 is set to 245 MHz. Each external resonance frequency can be adjusted by the length of the external resonator. The center frequency of the output light intensity signal of the first laser 501 and the center frequency of the output light intensity signal of the second laser 502 are each set to about 6 GHz (step S61). At this time, the center frequencies of the two are set to have a non-integer ratio so as not to coincide. Further, as shown in the first embodiment, the amplitude of the RF spectrum of the output light intensity signals of the first laser 501 and the second laser 502 is set so as to be 25 dB or less of the amplitude adjustment width.

  Then, the output light intensity signal of the first laser 501 is injected into the second laser 502 (step S62). At this time, the wavelength of the second laser 502 is such that the width of the RF spectrum of the output light intensity signal of the second laser in the frequency axis direction is the output of the first laser 501 when the output light intensity signal of the first laser is injected. The light intensity signal is set to a value that is wider than when no injection is performed. For example, the wavelength of the first laser 501 is set shorter than the wavelength of the second laser 502 so that injection locking does not occur. The wavelength is controlled by changing the temperatures of the lasers 501 and 502 in the temperature control unit. In this case, the temperature control unit 503 that controls the temperature of the first laser 501 controls the temperature of the first laser 501 so as to be shorter than the wavelength of the second laser 502.

  An example of the RF spectrum of the output light intensity signal of the second laser 502 set in this way is shown in FIG. The horizontal axis of Fig.7 (a) is frequency [GHz], and a vertical axis | shaft is power [dBm]. Two peaks of 5.88 GHz and 12.06 GHz can be confirmed. This is because the frequency band of the second laser 502 is expanded to 12.06 GHz by injecting the output light intensity signal of the first laser 501 with respect to the center frequency of about 6 GHz of the output light intensity signal of the second laser 502. It has been shown.

  FIG. 7B shows characteristics obtained by enlarging the range of 4 to 6 GHz in FIG. The vertical and horizontal axes in FIG. 7B are the same as those in FIG. RF spectra of the external resonance frequency 107 MHz of the first laser 501 and the external resonance frequency 245 MHz of the second laser 502 can be confirmed.

  FIG. 8 shows the result of observing the output light intensity signal whose frequency band is expanded in this way in the time domain. The vertical axis and horizontal axis in FIG. 7 are the same as in FIG. 3C described above, the horizontal axis is time [ns], and the vertical axis is intensity. Compared with FIG.3 (c), the frequency of the chaotic time oscillation waveform is also high because the frequency band widened. Accordingly, the chaotic laser oscillator 500 can be used for generating a higher-speed binary random number sequence.

  FIGS. 7 (c) and 7 (d) show the results of calculating the autocorrelation coefficient in the time axis direction with reference to a certain time of the chaotic time oscillation waveform. The horizontal axis is the delay time [ns] based on a certain time, and the vertical axis is the value of the autocorrelation coefficient. FIG. 7 (d) is an enlarged view of the time axis of FIG. 7 (c). 0 indicates no correlation, 1 indicates complete correlation (the same waveform), and -1 indicates a waveform whose phase is inverted. The autocorrelation coefficient corresponding to the round trip time of the light of the external resonator (reciprocal of the external resonance frequency) increases. The autocorrelation coefficients of the delay times 4.1 ns and 9.3 ns corresponding to the external resonance frequency 245 MHz of the second laser 502 and the external resonance frequency 107 MHz of the first laser 501 are large. In FIG. 7D in which the time axis is expanded, the autocorrelation coefficients of 0.08 ns and 0.17 ns of delay times corresponding to the peak frequencies of 12 GHz and 5.8 GHz at both ends where the frequency band is expanded are large. I understand that. Therefore, for example, if the clock frequency for generating the binary random number is set to 2.5 GHz, it is not necessary to be affected by the increase of the autocorrelation coefficient in the region of less than 0.4 ns.

  As described above, the frequency of the chaotic time oscillation waveform generated by the chaotic laser oscillator 500 shown in the second embodiment can be set higher than that of the chaotic laser oscillator 100 of the first embodiment. It can be used for an ultra-high speed physical random number generator. Hereinafter, an embodiment of an ultrafast physical random number generator using the chaotic laser oscillator described in the first and second embodiments will be described.

  FIG. 9 shows a functional configuration example of an ultrafast physical random number generation apparatus 900 using the chaotic laser oscillator of the present invention as a random number source as a third embodiment. The operation flow is shown in FIG. The ultrafast physical random number generation device 900 includes a laser oscillation unit 901, a light detection unit 902, a periodic clock generation unit 903, and a threshold processing unit 904. The periodic clock generation unit 903 and the threshold processing unit 904 are realized by a computer that is realized by reading a predetermined program into a computer including, for example, a ROM, a RAM, and a CPU and executing the program by the CPU. May be. Alternatively, each functional component may be realized individually by hardware. The same applies to each device described below.

  The laser oscillation unit 901 is the chaotic laser oscillator described in the first or second embodiment. The output light intensity signal output from the laser oscillating unit 901 is in a chaotic state, and its amplitude fluctuates randomly (see step S901, FIG. 3C). The randomly varying output light intensity signal is converted into an AC electrical signal by the light detection unit 902 (step S902). The periodic clock generator 903 generates a periodic clock that determines the timing for converting the AC electrical signal into a binary random number signal (step S903). The threshold processing unit 904 converts the AC electrical signal into a binary random number signal at the timing of the periodic clock (step S904).

  An example of how the threshold processing unit 904 converts the AC electrical signal into a binary random number signal is shown in FIG. In FIG. 11, the horizontal axis represents time [ns], the left vertical axis represents intensity, and the right vertical axis represents digital bit values. The AC electric signal output from the light detection unit 902 is input with the threshold value processing unit 904 after the DC component is removed. The mark ● superimposed on the AC electrical signal represents the rise timing of the periodic clock, for example. The threshold value processing unit 904 outputs the digital bit set to “1” if the AC electrical signal at time ● is positive, for example, and “0” if it is negative. As a result, as shown in FIG. 11, a binary random number signal sequence in which the time widths of “1” and “0” fluctuate randomly at intervals of an integral multiple of the period of the periodic clock is output.

  In the example shown in FIG. 11, the AC electrical signal is converted into digital bits on the basis of 0, but by adjusting the reference, that is, the threshold value, the appearance frequency of 0 in the binary random number sequence is about 50%. To. FIG. 12 shows the relationship between the threshold and 0 frequency. In FIG. 12, the horizontal axis indicates the threshold voltage [V], and the vertical axis indicates 0 frequency [%]. FIG. 12 shows that zero frequency can be adjusted with a resolution of 0.008V. The threshold voltage is adjusted so that the appearance frequency of 0 is closest to 50%. The evaluation of the quality of the binary random number obtained in this way as a random number will be described in the later-described random number evaluation result.

When a high-quality random number is required, the random number uniformization process may be further performed on the binary random number sequence output from the threshold processing unit 904. FIG. 9 shows the random number equalization processing unit 905 with broken lines. A specific example of the random number uniformization processing unit 905 is shown in FIG. The random number uniformization processing unit 905 includes shift registers (hereinafter referred to as “SF”) 131, 132, 133 and exclusive OR means 134. The binary random number sequence from the threshold processing unit 904 is input to the SF 131, and the SFs 131 to 133 are sequentially connected in series using the shift clock as a periodic clock. The output signal of each SF 131, 132, 133, the binary random number sequence, Is calculated by the exclusive OR means 134. The number of shift bits of each SF 131, 132, 133 is arranged in ascending order from the output side as a prime number. That is, the number of shift bits of SF 133 is τ ₁ = 3, the number of shift bits of SF 132 is τ ₂ = 5, and the number of shift bits of SF 131 is τ ₃ = 7.

  An operation time chart of the random number uniformization processing unit 905 is shown in FIG. When the binary random number sequence input from the threshold processing unit 904 is the example shown in FIG. 14, the exclusive OR unit 134 outputs a binary random number sequence expressed as EXOR. The random number equalization process is a concept of shifting and mixing binary random number signal sequences once generated, and an effect of making the random random number signal sequence more random can be expected. The effect of random number uniformization processing on the quality of random numbers will be described later.

  The random number uniformization processing unit 905 may be configured as shown in FIG. The random number uniformization processing unit 905 ′ shown in FIG. 15 includes SFs 131, 132, and 133 and three exclusive OR means 151, 152, and 153. This is fed back to the input 133. The basic idea is the same as that of the random number uniformization processing unit 905 shown in FIG.

  FIG. 16 shows a functional configuration example of an ultrafast physical random number generator 160 using the chaotic laser oscillator of the present invention as a random number source as a fourth embodiment. The operation flow is shown in FIG. The ultrafast physical random number generation device 160 includes a laser oscillation unit 901, a light detection unit 902, a 0 level detection unit 161, a periodic digital signal generation unit 162, and a sampling processing unit 163. The laser oscillation unit 901 and the light detection unit 902 are the same as the above-described ultrahigh-speed physical random number generation apparatus 900.

  The 0 level detection unit 161 detects the zero point of the AC electrical signal output from the light detection unit 902 (step S161). The periodic digital signal generator 162 generates a periodic digital signal that is faster than the center frequency of the output light intensity signal of the laser oscillator 901 (step S162). The sampling processing unit 163 samples the periodic digital signal at the timing when the 0 level detection unit 161 detects the zero point of the AC electrical signal, and outputs a binary random number signal (step S163).

  An example of each signal waveform in the above operation is shown in FIG. In FIG. 18, the horizontal axis represents time [ns], the left vertical axis represents the intensity of the AC electrical signal, and the right vertical axis represents the value of the periodic digital signal. From the top of FIG. 18, signal waveforms of an AC electrical signal, a periodic digital signal (CLK), and a binary random number signal are shown. The amplitude of the binary random number signal does not correspond to the vertical axis. 18 is an output light intensity signal generated by the chaotic laser oscillator 100 described above. Its center frequency is 2.62 GHz, and the frequency of the periodic digital signal is set to 5 GHz, which is higher than that. The time when the output light intensity signal is 0 is indicated by ●. The digital value of the periodic digital signal at that time is converted into a binary random number signal. The reason why the frequency of the periodic digital signal is set higher than the center frequency of the output light intensity signal is due to the inverse relationship of the sampling theorem. That is, if the frequency of the periodic digital signal is lower than the center frequency of the output light intensity signal, the periodicity of the periodic digital signal is reproduced by the output light intensity signal.

  Even in the ultra-high-speed physical random number generation device 160, by adjusting the threshold value of the 0 level detection unit 161, the appearance frequency of 0 in the binary random number signal sequence is set to about 50%. FIG. 19 shows the relationship between the threshold and 0 frequency. The horizontal axis in FIG. 19 indicates the threshold value with the voltage [V], and the vertical axis indicates the zero frequency with [%]. The threshold voltage is adjusted so that the appearance frequency of 0 is closest to 50%. In this example, the threshold value was set to 0.048V. It can be seen that the appearance frequency of 0 can be adjusted to 50% over a wider voltage range (0.03 to 0.07 V) than the threshold processing unit 904 of the ultrahigh-speed physical random number generator 900 described above.

  When the laser oscillation unit 901 is configured by the chaotic laser oscillator 500 using the two lasers described above, the frequency of the chaotic time oscillation waveform can be increased, so that a binary random number signal sequence can be generated at a higher speed. Become. In addition, as described above, the random number uniformization processing unit 905 may be further provided for the purpose of improving the quality of the binary random number value.

  FIG. 20 shows a functional configuration example of an ultrahigh-speed physical random number generation apparatus 200 using the chaotic laser oscillator of the present invention as a random number source as a fifth embodiment. The operation flow is shown in FIG. The ultrafast physical random number generation device 200 includes a laser oscillation unit 901, a light detection unit 902, a 0 level detection unit 161, a second laser oscillation unit 201, a second light detection unit 202, and a sampling processing unit 163. Prepare. The ultrahigh-speed physical random number generation device 200 is obtained by replacing the periodic digital signal generation unit 162 of the ultrahigh-speed physical random number generation device 160 with a second laser oscillation unit 201 and a second light detection unit 202.

  The second laser oscillation unit 201 is the chaotic laser oscillator described in the first or second embodiment. The output light intensity signal in the chaotic state output from the second laser oscillation unit 201 is converted into an AC electrical signal by the light detection unit 202 (step S202). In the fifth embodiment, an AC electrical signal output from the light detection unit 202 is sampled by the sampling processing unit 163. The sampling process is performed at the timing when the 0 level detection unit 161 detects the 0 level of the AC electric signal output from the light detection unit 202.

  This is shown in FIG. 22, the horizontal axis represents time [ns], the left vertical axis represents the intensity of the AC electrical signal output from the laser oscillation unit 901, and the right vertical axis represents the intensity of the AC electrical signal output from the second laser oscillation unit 201. From the top of FIG. 22, signal waveforms of an AC electrical signal output from the light detection unit 902, an AC electrical signal output from the second light detection unit 202, and a binary random number signal are shown. The mark ● superimposed on the AC electrical signal output from the light detection unit 902 is the 0 level detected by the 0 level detection unit 161, and the AC electrical signal output from the second light detection unit 202 at this timing is a binary random number. Converted to a signal. If the level of the output signal of the second light detection unit 202 at that timing is equal to or higher than a threshold value (for example, 0), the digital bit is converted to “1”, and if it is less than the threshold value, it is converted to “0” to be a binary value. Random number signal sequence. The amplitude of the binary random number signal does not correspond to the vertical axis.

  Thus, even if the periodic digital signal generator 162 is configured by the laser oscillation unit 201 and the light detection unit 202, an ultrahigh-speed physical random number generation device can be realized.

  FIG. 23 shows a functional configuration example of an ultrafast physical random number generator 230 using the chaotic laser oscillator of the present invention as a random number source as a sixth embodiment. The operation flow is shown in FIG. The ultrafast physical random number generator 230 includes a laser oscillation unit 901, a light detection unit 902, a threshold processing unit 904, a second laser oscillation unit 231, a second light detection unit 232, and a threshold processing unit. 233, a periodic clock generation unit 903, and an exclusive OR unit 234. The ultrafast physical random number generator 230 has the same configuration of the second laser oscillator 231 to the threshold processor 233 as the configuration of the laser oscillator 901 to the threshold processor 904 of the ultrafast physical random number generator 900 described above. Newly provided, the exclusive OR means 234 takes the exclusive OR of the binary random number signals output from the respective threshold processing units 904 and 233.

  Here, a specific example of the laser oscillation unit 901 and the second laser oscillation unit 231 is shown. Each laser was a DFB semiconductor laser for optical communication (model number NLK1555CCA), and the respective injection currents were 12.0 mA. The external resonator length of the laser oscillation unit 901 was set to 2.0 m, and the external resonator length of the second laser oscillation unit 231 was set to 1.4 m. As a result, the laser oscillation unit 901 has an external resonance frequency of 75.0 MHz with a center frequency of the output light intensity signal of 2.62 GHz, and the second laser oscillation unit 231 has an external resonance with a center frequency of the output light intensity signal of 3.42 GHz. The frequency was 108.0 MHz.

  FIG. 25 shows RF spectra of output light intensity signals from the laser oscillation unit 901 and the second laser oscillation unit 231. The horizontal axis is frequency [GHz], and the vertical axis is power [dBm]. FIG. 25A shows the characteristics of the laser oscillation unit 901, and FIG. 25B shows the characteristics of the second laser oscillation unit 231. FIGS. 25C and 25D show characteristics obtained by enlarging the respective frequency axes. FIG. 26 shows characteristics observed in the time domain and autocorrelation coefficients. 26A and 26C show the characteristics of the laser oscillation unit 901, and FIGS. 26B and 26D show the characteristics of the second laser oscillation unit 231. If the external resonance frequency of the laser oscillation unit 901 and the second laser oscillation unit 231 is set to a non-integer ratio as described above, the timing at which the autocorrelation coefficient increases becomes difficult to synchronize as described above. Can generate random numbers. Further, if the center frequency of the output light intensity signals of the laser oscillation unit 901 and the second laser oscillation unit 231 is set to a non-integer ratio, an uncorrelated random number can be generated for the same reason. Note that the laser oscillation unit 901 and the second laser oscillation unit 231 may be configured by the chaotic laser oscillator described in the second embodiment.

  The light detection unit 902 and the second light detection unit 232 may be the same as the ultrahigh-speed physical random number generation device 200 described above. The threshold processing units 904 and 232 convert the AC electrical signals output from the light detection units 902 and 232 into binary random number signals at the timing of the periodic clock output from the periodic clock generation unit 903 (steps S904 and S233). . The binary random number signals converted by the threshold processing units 904 and 233, respectively, are input to the exclusive OR means 234 to form one binary random number signal sequence (step S234). This is shown in FIG. FIG. 27A shows an AC electrical signal. FIG. 27B shows a binary random number signal obtained by converting the AC electrical signal of FIG. 27A into a digital value at the same time. The horizontal axis represents time [ns], the vertical axis in FIG. 27A represents the intensity of the AC electric signal, and the vertical axis in FIG. 27B represents the value of the digital bit.

  The upper signal shown in FIG. 27A is an AC electrical signal output from the light detection unit 902, and the lower signal is an AC electrical signal output from the second light detection unit 232. The timing of the periodic clock signal output from the periodic clock generator 903 is indicated by ● and is superimposed on each waveform. FIG. 27B shows the result of converting the AC electrical signal at the timing ● into a binary random number signal.

  The upper signal shown in FIG. 27B is a signal obtained by converting the AC electrical signal output from the light detection unit 902 into a binary random number signal by the threshold processing unit 904, and the lower signal is the second light detection unit 232. This is a signal obtained by converting the AC electric signal to be output into a binary random number signal by the threshold processing unit 233. The digital bit is converted to “1” if the level of each AC electric signal is equal to or higher than a threshold value (for example, 0), and is converted to “0” if the level is less than the threshold value. The converted binary random number signals are input to the exclusive OR means 234 to form one binary random number signal sequence as shown at the bottom of FIG. 27 (b). The amplitude of each binary random number signal shown in FIG. 27B does not correspond to the vertical axis.

  The exclusive OR means 234 calculates the exclusive OR for the binary random number signals output from the respective threshold processing units 904 and 233, and the frequency of occurrence of 0 in the output binary random number signal is 50. Adjust the threshold to be%. FIG. 28 shows the relationship between the threshold value and 0 frequency. The horizontal axis indicates the threshold voltage [V], and the vertical axis indicates 0 frequency [%]. First, the threshold processing unit 904 is adjusted so that the zero frequency of the output signal of the exclusive OR unit 234 is closest to 50% (step S904). The characteristic example is shown in FIG. By setting the threshold value of the threshold value processing unit 904 to 0.008V, the zero frequency of the binary random number signal output from the exclusive OR means 234 is adjusted to be closest to 50%.

  Next, FIG. 28B shows a result obtained by adjusting the threshold processing unit 233 and measuring a change in 0 frequency output from the exclusive OR unit 234. The adjustment sensitivity of the threshold processing unit 904 is about 0.0125% / 0.008V, whereas the adjustment sensitivity of the threshold processing unit 904 is about 0.051% / 0.008V (see FIG. 28A). It has about 4 times the sensitivity. Therefore, the zero frequency adjustment is easier than in the case of one threshold processing unit. In addition, since the sensitivity is high, the zero frequency adjustment can be accurately performed by increasing the threshold voltage adjustment resolution. In the example shown in FIG. 28B, since the adjustment resolution of the threshold processing unit 233 is 0.008 V, the zero frequency output from the final exclusive OR unit 234 can be adjusted to 49.996%. (Step S233).

  As described above, in the case of the sixth embodiment, since there are two independent threshold value adjustment units 904 and 233, an effect of increasing the degree of freedom of zero frequency adjustment necessary for improving randomness can be obtained. . Further, since the output signals of the two chaotic laser oscillation units are mixed, a higher quality random number can be obtained. The quality of the binary random number signal generated by the ultra-high speed physical random number generator 230 having the configuration of the sixth embodiment will be described later.

  In the configuration using two chaotic laser oscillation units, the tendency that the magnitude of the RF spectrum amplitude of the output light intensity signal affects the quality of the binary random number also changes. FIG. 29 shows the result of changing the number of pass items of the random number test method NIST SP800-22 by changing the amplitude of the RF spectrum of the output light intensity signal of the laser oscillation unit 901 and the second laser oscillation unit 231 using an optical attenuation filter. Shown in FIG. 29 shows the number of acceptable items when the injection current of the laser oscillation unit 901 and the second laser oscillation unit 231 is constant at 19 mA and the transmittance of each optical attenuation filter is varied in the range of 100 to 26.8%. The horizontal direction is the transmittance of the laser oscillation unit 901, and the vertical direction is the transmittance of the second laser oscillation unit 231. When each transmittance is 41.6% or more, the number of acceptable items greatly increases. The change in the amplitude of the RF spectrum when the transmittance is varied is the same as that in FIG. 4 described above. The amplitude of the RF spectrum when the transmittance is 33.4% is 24.33 dB, and the transmittance is 41.6. % Is 13.67 dB. Therefore, it can be seen that in a configuration using two chaotic laser oscillation units, a better-quality binary random number signal can be obtained if the amplitude of each RF spectrum is set to 20 dB or less.

[Random number evaluation result]
The quality of the binary random number signal obtained by configuring the ultrahigh-speed physical random number generation device 900 of Example 3 was evaluated. Using a DFB semiconductor laser (model number NLK1555CCA) for optical communication, an ultrahigh-speed physical random number generator 900 at a speed of 1 Gbit / sec with an injection current value of 12.0 mA, an external resonator length of 2.0 m, a periodic clock signal of 1 GHz FIG. 30 is a diagram in which the binary random number signal sequence generated by is visualized. FIG. 30 simply shows a binary random number signal sequence on a 500 × 500 two-dimensional plane with “0” being white and “1” being black. This figure is generally used for evaluating the quality of a random number generator. Since regularity is not seen in the black and white pattern, it can be seen that a highly random binary random number signal sequence is generated.

  FIG. 31 shows the result of testing this binary random number signal sequence by the random number test method NIST SP800-22. There are 15 items as the test method, and the average value, the proportion value and the test result of the p-value for each test method are shown. The p-value is a probability that the randomness is higher than that of a true random number, and passes when the value is 0.01 or more. The proportion value indicates the uniformity of the p-value, and when 1 Gbit data is used for the random number test, it passes in the range of 0.9806 to 0.9994. The four items of the “Rank test”, “Random deviation test”, “Various random deviation test”, and “Linear complexity test” passed. It can be said that the larger the number of accepted items, the better the quality of the random number, but even if the number of items is small, it can be used sufficiently depending on the application.

  When the random number uniformization process described above is performed on the binary random number signal sequence, the quality of the random number sequence can be improved. The result is shown in FIG. 32 (a) and 32 (b) show the change of the pass items of the random number test method NIST SP800-22 by changing the number of SF stages of the random number equalization processing unit 905 described with an example in FIG. It is the result of seeing. The horizontal axis is the number of SF stages, and the vertical axis is the number of evaluation items passed. FIG. 32A shows the case of random number equalization processing with feedback shown in FIG. 15, and FIG. 32B shows the case of no feedback shown in FIG. In both cases, it is found that all 15 items are passed by setting the number of SF stages to 4 or more.

  FIGS. 32C and 32D show the case where the horizontal axis is the number of shift bits. FIG. 32C shows the case with feedback, and FIG. 32D shows the case without feedback. In the case of feedback, the number of accepted items increases as the number of shift bits is increased. Without feedback, simply increasing the number of shift bits does not increase the number of accepted items. Increasing the number of SF stages is more effective. In the case of the configuration of the ultra-high speed physical random number generation apparatus 900, random number equalization processing is necessary to pass all the evaluation items according to the random number test method NIST SP800-22.

  In addition, the quality of the binary random number signal obtained by configuring the ultra-high speed physical random number generator 230 of Example 6 was evaluated. The same DFB semiconductor laser for optical communication (model number NLK1555CCA) as in the above experiment (evaluation of Example 3) was used. The injection current of the laser oscillation unit 901 was set to 12.0 mA, the center frequency of the output light intensity signal was set to 2.62 GHz, and the external resonator length was set to 2.0 m. The injection current of the second laser oscillation unit 231 was set to 12.0 mA, the center frequency of the output light intensity signal was set to 3.42 GHz, and the external resonator length was set to 1.4 m. FIG. 33 shows a visualized binary random number signal sequence generated by the ultrahigh-speed physical random number generation device 230 at a rate of 1 Gbit / s with a periodic clock signal of 1.0 GHz. FIG. 33 is simply described on a two-dimensional plane of 500 × 500, in which “0” is white and “1” is black in the same binary random number signal sequence as FIG. 30 described above.

  FIG. 34 shows the result of testing this binary random number signal sequence by the random number test method NIST SP800-22. FIG. 34 is the same as FIG. 31 described above. Results that pass all tests were obtained. In addition, there is DIEHARD, which is proposed by the University of Florida as an international standard. This is a random number test method consisting of 18 items, and the p-value is calculated in the same manner as NIST SP800-22. The results of testing with DIEHARD are shown in FIG. The horizontal axis in FIG. 35 is p-value, and the vertical axis is the evaluation item number. In each evaluation item number, if the p-value is uniformly distributed between 0 and 1, it is passed. It turns out that it passed all 18 items. Thus, in the case of the configuration of the ultra-high speed physical random number generator 230, high quality random numbers that pass all the evaluation items according to the random number test method NIST SP800-22 are generated without using random number equalization processing. it can.

  Here, FIG. 36 shows the change in the number of pass items for NIST SP800-22 when the external resonator lengths of the laser oscillation unit 901 and the second laser oscillation unit 231 are varied. The horizontal direction is the external resonator length of the laser oscillation unit 901, and the vertical direction is the second laser oscillation unit 231. It can be seen that the number of passing items on the diagonal line where the external resonator lengths match each other is small. When the external resonator lengths of the laser oscillation unit 901 and the second laser oscillation unit 231 are the same, the external resonance frequency becomes almost the same value, and the clock frequency generated by the periodic clock generation unit 903 and the output of the laser oscillation unit This is considered to be because the timing when the autocorrelation coefficient of the light intensity signal increases is easily synchronized. In addition, the number of acceptable items is reduced even when the combination of the external resonator length of 2.8 m of the laser oscillation unit 901 and the external resonator length of 1.4 m of the second laser oscillation unit 231 with each external resonator length being an integer ratio. ing. Therefore, it is understood that each external resonator length is preferably set to a non-integer ratio.

  Next, FIG. 37 shows changes in the number of NIST SP800-22 test pass items when the injection current value of each laser is varied. 36, the horizontal direction is the injection current value of the laser oscillation unit 901, and the vertical direction is the injection current value of the second laser oscillation unit 231. Similar to the external resonator length, there is a characteristic that the number of accepted items on the diagonal line where the injection current values of the laser oscillation units 901 and 231 coincide with each other is small. This is because when the injection current values are set to the same value, the center frequencies of the output light intensity signals become close to each other, and the timing at which the autocorrelation coefficient of the output light intensity signal becomes large is generated by the periodic clock generator 903. This is considered to be because the probability of synchronization with the clock frequency to be increased increases. Therefore, it is desirable to set the value of the injection current of each laser oscillation unit to a non-integer ratio.

  Further, by combining the chaotic laser oscillator 500 of the second embodiment and the ultrahigh-speed physical random number generator 230 of the sixth embodiment, an output light intensity signal having a frequency band of 12 GHz is generated from the chaotic laser oscillator, and 3.1 Gbits per second is generated. Realized binary random number generation at speed. The generated random numbers were able to pass all the random test items of NIST SP800-22 and DIEHARD.

As described above, according to the ultra-high speed physical random number generator of the present invention, it is possible to easily generate a binary random number signal sequence at a speed of 1 Gbit / second or more. In the above-described embodiment, the generation speed of the binary random number signal has been described with an example of about 1 to 3.1 Gbit / s. However, by connecting the ultra-high speed physical random number generator of the present invention in parallel, 100 Gbit / s. A degree of generation speed is also feasible. Alternatively, the center frequency of the output light intensity signal in the chaotic oscillation state generated by the chaotic laser oscillator of the present invention may be set to about 100 GHz.

In the above description, only an example of generating a binary random number signal sequence has been described. However, the technical idea of the present invention is not limited to this example. The binary random number signal sequence generated based on the idea of the present invention can be converted into a random number signal having a desired bit length by reading the binary random number signal sequence once in a memory and then reading it with an arbitrary bit length.

  Further, the processes described in the above method and apparatus are not only executed in time series according to the order of description, but also may be executed in parallel or individually as required by the processing capability of the apparatus that executes the processes. Good.

  Further, when the processing means in the above apparatus is realized by a computer, the processing contents of functions that each apparatus should have are described by a program. Then, by executing this program on the computer, the processing means in each apparatus is realized on the computer.

  The program describing the processing contents can be recorded on a computer-readable recording medium. As the computer-readable recording medium, for example, any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory may be used. Specifically, for example, as a magnetic recording device, a hard disk device, a flexible disk, a magnetic tape or the like, and as an optical disk, a DVD (Digital Versatile Disc), a DVD-RAM (Random Access Memory), a CD-ROM (Compact Disc Read Only). Memory), CD-R (Recordable) / RW (ReWritable), etc., magneto-optical recording medium, MO (Magneto Optical disc), etc., semiconductor memory, EEP-ROM (Electronically Erasable and Programmable-Read Only Memory), etc. Can be used.

  The program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Further, the program may be distributed by storing the program in a recording device of a server computer and transferring the program from the server computer to another computer via a network.

  Each means may be configured by executing a predetermined program on a computer, or at least a part of these processing contents may be realized by hardware.

The figure which shows the function structural example of the chaos laser oscillator 100 which is an example of the chaos laser oscillator of this invention. The figure which shows the flow of the adjustment method of the chaos laser oscillator. It is a figure which shows the characteristic of the output light intensity signal of the chaotic laser oscillator 100, (a) shows RF spectrum, (b) shows the RF spectrum which expanded the frequency axis of (a), (c) is output light. FIG. 4D shows a waveform obtained by observing an intensity signal on the time axis, and FIG. The figure which shows the result of having changed the amplitude of RF spectrum of the output light intensity signal of the chaotic laser oscillator 100 with the optical attenuation filter 105. FIG. The figure which shows the function structural example of the chaos laser oscillator 500 which is an example of the chaos laser oscillator of this invention. The figure which shows the flow of the adjustment method of the chaos laser oscillator 500. FIG. It is a figure which shows the characteristic of the output light intensity signal of the chaotic laser oscillator 500, (a) shows RF spectrum, (b) shows the RF spectrum which expanded the frequency axis of (a), (c) is a self phase. It is a figure which shows the number of relations, (d) shows the waveform which expanded the time axis of (c). The figure which shows the waveform which observed the characteristic of Fig.7 (a) on the time-axis. The figure which shows the function structural example of the ultra-high-speed physical random number generator 900 of this invention. The figure which shows the operation | movement flow of the ultra-high-speed physical random number generation apparatus 900. The figure which shows an example of a threshold value processing part 904 of the ultra-high-speed physical random number generator 900 converting an alternating current electrical signal into a binary random number signal. The figure which shows the relationship between the threshold value of the threshold value process part 904 of the ultra-high-speed physical random number generation apparatus 900, and 0 frequency. The figure which shows the function structural example of the random number equalization process part 905. The figure which shows an example of the operation | movement time chart of the random number equalization process part 905. The figure which shows the other function structural example of a random number equalization process part. The figure which shows the function structural example of the ultra-high-speed physical random number generator 160 of this invention. The figure which shows the operation | movement flow of the ultra-high-speed physical random number generator 160. The figure which shows an example of a mode that the 0 level detection part 161 and the sampling process part 163 of the ultra-high-speed physical random number generator 160 convert an alternating current electrical signal into a binary random number signal. The figure which shows the relationship between the threshold value of the 0 level detection part 161 of the ultra-high-speed physical random number generator 160, and 0 frequency. The figure which shows the function structural example of the ultra-high-speed physical random number generator 200 of this invention. The figure which shows the operation | movement flow of the ultra-high-speed physical random number generator 200. The figure which shows an example of a mode that the 0 level detection part 161 and the sampling process part 163 of the ultra-high-speed physical random number generator 200 convert an alternating current electrical signal into a binary random number signal. The figure which shows the function structural example of the ultra-high-speed physical random number generator 230 of this invention. The figure which shows the operation | movement flow of the ultra-high-speed physical random number generator 230. FIG. 6 is a diagram illustrating RF spectra of a laser oscillation unit 901 and a second laser oscillation unit 231 of the ultrafast physical random number generator 230, (a) is a diagram illustrating an RF spectrum of an output light intensity signal of the laser oscillation unit 901; ) Is a diagram showing an RF spectrum of an output light intensity signal of the second laser oscillation unit 231, and (c) and (d) are diagrams in which those frequency axes are enlarged. It is a figure which shows the waveform which observed the output light intensity signal of the laser oscillation part 901 and the 2nd laser oscillation part 231 of the ultra-high-speed physical random number generator 230 on the time axis, (a) is the laser oscillation part 901, (b ) Is the second laser oscillation unit 231, and (c) and (d) are diagrams showing their autocorrelation coefficients. It is a figure which shows the operation | movement waveform of the threshold value processing parts 904 and 233 of the ultra-high-speed physical random number generator 230, and the exclusive OR means 234, (a) shows an alternating current electric signal, (b) is threshold value processing. The figure which shows the digital bit which a part and an exclusive OR means output. It is a figure which shows the relationship between the threshold value of the threshold value processing part of the ultrahigh-speed physical random number generator 230, and 0 frequency, (a) shows the characteristic of the threshold value processing part 904, (b) is a threshold value. The figure which shows the characteristic of the value process part. The figure which shows the result of having changed the amplitude of RF spectrum of the output light intensity signal of the laser oscillation part 901 and the 2nd laser oscillation part 231 with the optical attenuation filter, and seeing the change of the number of passing items of random number test system NIST SP800-22 . The figure which visualized the binary random number signal sequence which the ultra-high speed physical random number generation device 900 generated. The figure which shows the result of having test | inspected the binary random number signal sequence which the super-high-speed physical random number generator 900 produced | generated by the random number test system NIST SP800-22. It is a figure which shows the evaluation item pass number at the time of performing random number equalization processing to the binary random number signal sequence which the ultra-high-speed physical random number generation apparatus 900 produced | generated, (a) is the number of stages of a shift register with feedback, and pass. (B) is a diagram showing the number of stages of the shift register without feedback and the number of acceptance, (c) is a diagram showing the number of shift bits and the number of acceptance of (a), and (d) is (b) ) Is a diagram showing the number of shift bits and the number of passes. The figure which visualized the binary random number signal sequence which the ultra-high speed physical random number generation device 230 generated. The figure which shows the result of having tested the binary random number signal sequence which the super-high-speed physical random number generator 230 produced | generated by the random number test system NIST SP800-22. The figure which shows the result of having tested the binary random number signal sequence which the super-high-speed physical random number generator 230 produced | generated by DIEHARD. The figure which shows the change of the number of test pass items of NIST SP800-22 when the external resonator length of the laser oscillation part 901 and the 2nd laser oscillation part 231 is varied. The figure which shows the change of the number of test pass items of NIST SP800-22 when the injection current value of the laser oscillation part 901 and the 2nd laser oscillation part 231 is varied. The figure which shows the function structure of the conventional super-high-speed physical random number generator disclosed by patent document 3. FIG.

Claims (12)

Laser,
In a composite resonance laser comprising an injection current control unit for controlling the injection current of the laser, and an external resonator including an external mirror and an optical attenuation filter,
The external resonance frequency corresponding to the reciprocal of the round trip time of light in the external resonator is set to a non-integer ratio with respect to the clock frequency for generating a binary random number,
The center frequency of the output light intensity signal of the composite resonant laser is set to be equal to or higher than the clock frequency and a non-integer ratio to the clock frequency,
The amplitude level of the RF spectrum of the output light intensity signal of the composite resonant laser is set to 25 dB or less of the amplitude adjustment width,
A chaotic laser oscillator, characterized in that the output light intensity signal of the composite resonant laser is set in a chaotic oscillation state in which it oscillates irregularly. A first laser and a second laser that are the chaotic laser oscillator according to claim 1, and a temperature control unit that controls the temperature of each,
The first laser and the second laser are configured such that an output light intensity signal of the first laser is injected into the second laser and an output light intensity signal of the second laser is output to the outside.
The external resonance frequency of the second laser is set to a non-integer ratio with respect to the external resonance frequency of the first laser,
Further, the wavelength of the second laser is such that when the output light intensity signal of the first laser is injected, the width in the frequency direction of the RF spectrum of the output light intensity signal of the second laser is the output of the first laser. A chaotic laser oscillator characterized in that the light intensity signal is set to be wider than that when no injection is performed. A laser oscillation unit comprising the chaotic laser oscillator according to claim 1 or 2,
A light detection unit that converts an output light intensity signal of the laser oscillation unit into an AC electrical signal;
A periodic clock generator for generating a periodic clock;
A threshold processing unit for converting the AC electrical signal output from the light detection unit at a timing of the periodic clock into a binary random number signal;
An ultrahigh-speed physical random number generator. A laser oscillation unit comprising the chaotic laser oscillator according to claim 1 or 2,
A light detection unit that converts an output light intensity signal of the laser oscillation unit into an AC electrical signal;
A zero level detection unit for detecting zero point of the AC electric signal;
A periodic digital signal generator for generating a periodic digital signal faster than the center frequency of the output light intensity signal;
A sampling processing unit that samples the periodic digital signal at the timing when the zero point is detected and outputs a binary random number signal;
An ultrahigh-speed physical random number generator. In the ultrahigh-speed physical random number generator according to claim 4,
The periodic digital signal generation unit includes a second laser oscillation unit including the chaotic laser oscillator according to claim 1 and a second light that converts an output light intensity signal of the second laser oscillation unit into an AC electric signal. An ultra-high-speed physical random number generation device comprising a detection unit. A first laser oscillation unit and a second laser oscillation unit comprising the chaotic laser oscillator according to claim 1;
A first light detection unit and a second light detection unit for converting the output light intensity signals of the first and second laser oscillation units into first and second AC electric signals, respectively;
A periodic clock generator for generating a periodic clock;
A first threshold value processing unit for converting the first AC electric signal output by the first light detection unit at a timing of the periodic clock into a binary signal;
A second threshold value processing unit for converting the second AC electrical signal output by the second photodetection unit at a timing of the periodic clock into a binary signal;
An exclusive OR means having an exclusive OR of the binary signal output from the first threshold processing unit and the second threshold processing unit as an output signal;
An ultrahigh-speed physical random number generator. A laser oscillation process in which a laser oscillation unit generates an output light intensity signal in a chaotic oscillation state;
A light detecting unit that converts the output light intensity signal into an AC electrical signal; and
A periodic clock generating unit for generating a periodic clock;
A threshold processing step in which a threshold processing unit converts the AC electric signal output from the light detection unit into a binary signal at the timing of the periodic clock;
An ultrafast physical random number generation method comprising: A laser oscillation process in which a laser oscillation unit generates an output light intensity signal in a chaotic oscillation state;
A light detecting unit that converts the output light intensity signal into an AC electrical signal; and
A zero level detection process in which a zero level detector detects the zero point of the AC electrical signal;
A periodic digital signal generating unit for generating a periodic digital signal faster than the center frequency of the output light intensity signal;
A sampling process in which the sampling processing unit samples the periodic digital signal at the timing when the zero point is detected and outputs a binary signal;
An ultrafast physical random number generation method comprising: In the ultra-high speed physical random number generation method according to claim 8,
The periodic digital signal generation process is as follows:
A step of generating an output light intensity signal in a chaotic oscillation state by the second laser oscillation unit;
A second light detection unit converting the output light intensity signal into an AC electrical signal;
An ultra-high speed physical random number generation method comprising: A laser oscillation process in which the first laser oscillation unit and the second laser oscillation unit respectively generate an output light intensity signal in a chaotic oscillation state;
A light detection process in which the first light detection unit and the second light detection unit respectively convert the output light intensity signals of the first and second laser oscillation units into AC electric signals;
A periodic clock generating unit for generating a periodic clock;
A first threshold value processing unit, wherein the first threshold value processing unit converts the AC electric signal output from the first light detection unit into a binary signal at the timing of the periodic clock;
A second threshold value processing unit, wherein the second threshold value processing unit converts the AC electric signal output from the second photodetection unit at a timing of the periodic clock into a binary signal;
An exclusive OR means, wherein an exclusive OR process using an exclusive OR of the binary signal output from the first threshold processing unit and the second threshold processing unit as an output signal;
An ultrafast physical random number generation method comprising:   Each unit other than the laser oscillation unit including the first and second laser oscillation units and the photodetection unit including the first and second photodetection units of the ultrahigh-speed physical random number generation device according to any one of claims 3 to 6. Program for making the functions of the computer function on a computer.   The computer-readable recording medium which recorded the apparatus program in any one of Claim 11.

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