CN114696914B - Solution to coherent i Xin Ji and combinatorial optimization problem - Google Patents
Solution to coherent i Xin Ji and combinatorial optimization problem Download PDFInfo
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- CN114696914B CN114696914B CN202011644205.5A CN202011644205A CN114696914B CN 114696914 B CN114696914 B CN 114696914B CN 202011644205 A CN202011644205 A CN 202011644205A CN 114696914 B CN114696914 B CN 114696914B
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Abstract
The invention provides a solution to the problem of coherent i Xin Ji and combinatorial optimization, coherent i Xin Ji comprising: the linearly polarized light generating module is used for generating first linearly polarized light; the microwave signal generation module is used for generating a microwave signal; the light splitting and logic operation module is used for generating a feedback signal to control the polarization modulator to generate an optical pulse signal with a single polarization state; the polarization modulator is used for modulating the first linearly polarized light by using the microwave signal and the feedback signal to obtain second linearly polarized light; a wave plate for converting the second linearly polarized light into third linearly polarized light having oscillation directions orthogonal to each other; the first optical coupler is used for splitting the third linearly polarized light, one beam is input into the microwave signal generating module, and the other beam is input into the light splitting and logic operation module. The coherent i Xin Ji of the present invention can achieve high coherence, programmable, large scale unification and solve complex combinatorial optimization problems.
Description
Technical Field
The invention relates to the technical field of microwave photonics, in particular to a solution to the problems of coherent I Xin Ji and combination optimization.
Background
The optimization problem is a kind of problem which we frequently encounter, such as path optimization problem, when traveling several cities, an optimal traveling sequence is found, so that the travel of all cities can be ensured, and the path can be minimized. This is a very typical optimization problem, where the number of cities that need to be traversed is small, solutions to the problem can be obtained in a short time by exhaustion or other means, but as the number of cities that need to be traversed increases, the time required to obtain the optimal solution will increase exponentially, and it is obviously difficult to continue using conventional methods to solve the increasingly complex optimization problem.
Moreover, in the face of the high-speed development of society, the optimization problems facing to the society are more and more, the complexity of the problems needing to be optimized is higher and higher, and the high-speed development of society also puts higher demands on the real-time performance of problem solving, so that a better solution is needed to find the solution of the optimization problem.
It has been found that such problems can be solved by using i Xin Moxing, and there are many studies on this, mainly, quantum annealing, which requires a temperature and is limited by the number of qubits, optical parametric oscillation with low oscillation stability, and the like.
Disclosure of Invention
First, the technical problem to be solved
Aiming at the prior art problems, the invention provides a solution to the problems of coherent Yi Xin Ji and combinatorial optimization, which is used for at least partially solving the technical problems.
(II) technical scheme
The present invention provides a coherent i Xin Ji comprising: the linearly polarized light generating module A is used for generating first linearly polarized light; the microwave signal generation module B is used for generating a microwave signal; the light splitting and logic operation module C is used for generating a feedback signal; a polarization modulator 3, configured to modulate the first linearly polarized light by using the microwave signal and the feedback signal, so as to obtain second linearly polarized light, where a polarization state of the second linearly polarized light is periodically changed; a wave plate 4 for converting the second linearly polarized light into third linearly polarized light, the oscillation directions of the third linearly polarized light being orthogonal to each other; the first optical coupler 5 is used for splitting the third linearly polarized light, one beam is input into the microwave signal generating module B, and the other beam is input into the light splitting and logic operation module C; the microwave signal generation module B is used for converting one beam of third linearly polarized light into a microwave signal, the light splitting and logic operation module C is used for splitting the other beam of third linearly polarized light to obtain fourth linearly polarized light and fifth linearly polarized light, and the intensity of the fourth linearly polarized light is larger than that of the fifth linearly polarized light; the light splitting and logic operation module C is also used for generating a feedback signal through logic operation and inputting the feedback signal into the polarization modulator 3, wherein the polarization modulator 3 is used for enhancing fourth linearly polarized light, weakening fifth linearly polarized light and circularly modulating to obtain a pulse signal with a single polarization state.
Optionally, the light splitting and logic operation module C includes: the polarization splitting prism 11, the photoelectric detection device 8 and the logic operation module D, wherein the polarization splitting prism 11 is used for splitting another beam of third linearly polarized light, the photoelectric detection device 8 is used for converting fourth linearly polarized light and fifth linearly polarized light into a first electric signal and a second electric signal respectively, and the logic operation module D is used for carrying out logic operation on the first electric signal and the second electric signal and generating a feedback signal.
Optionally, the microwave signal generating module B includes: an analyzer 6, a long optical fiber 7 and a fourth photodetector 9; wherein the analyzer 6 is configured to convert a third linearly polarized light beam into an intensity modulated light beam; the long optical fiber 7 is used for storing the intensity-modulated light to prolong the transmission time of the intensity-modulated light, and simultaneously, a time division multiplexing technology is utilized to realize large-scale pulse signals in a single polarization state; the fourth photodetector 9 is used to convert the intensity modulated light into a third electrical signal.
Optionally, the coherent i Xin Ji further comprises: the filter 10, the filter 10 is an electrical filter for filtering an electrical signal transmitted in an electrical circuit or an optical filter for filtering an optical signal transmitted in an optical path.
Optionally, the logic operation module D includes: the analog-to-digital converter 12, the logic operation unit 13 and the digital-to-analog converter 14, wherein the analog-to-digital converter 12 is used for converting the first electric signal and the second electric signal into the first digital signal and the second digital signal, the logic operation unit 13 is used for processing the first digital signal and the second digital signal to judge the intensity of the fourth linearly polarized light and the fifth linearly polarized light and generate a feedback signal, and the digital-to-analog converter 14 is used for converting the feedback signal into an analog signal and then transmitting the analog signal to the polarization modulator 3; the logic operation unit 13 includes any one of a CPU, FPGA, GPU, or ASIC.
Alternatively, the photo-detecting means 8 comprises a first photo-detector 8a and a second photo-detector 8b in parallel, or a two-channel third photo-detector 8c.
Optionally, the linearly polarized light generating module a includes: a pulse laser 1 and a polarization controller 2, wherein the pulse laser 1 is used for generating a laser pulse signal, and the polarization controller 2 is used for converting the laser pulse signal into first linearly polarized light; the optical path of the transmitted optical signal of coherent i Xin Ji includes at least one polarization controller 2.
Optionally, the microwave signal generating module B further includes: the second optical coupler 15 and the third optical coupler 16, wherein the second optical coupler 15 is configured to split the intensity-modulated light into at least two light signals, delay the at least two light signals respectively, and then combine the light signals through the third optical coupler 16.
Optionally, coherent i Xin Ji further includes: at least one amplifier 17 for signal amplification of the first linearly polarized light and/or the microwave signal and/or the second linearly polarized light and/or the third linearly polarized light, the amplifier 17 comprising an optical amplifier and/or an electrical amplifier; the light splitting and logic operation module C further comprises: the first mixer 18a and the second mixer 18b are respectively connected with the input and the output of the logic operation module D, the first mixer 18a is used for mixing the first electric signal and the second electric signal, and the second mixer 18b is used for mixing the feedback signal.
Another aspect of the present invention provides a solution to the problem of combinatorial optimization, comprising: using the two oscillation directions of the third linearly polarized light to represent two spin states of the Icine spin respectively; mapping the combinatorial optimization problem into gain and loss states of the oscillation loop; solving the minimum value of the Ictan energy of the oscillation loop to obtain an optimal solution of the combined optimization problem; wherein solving for the minimum value of the isooctyl energy of the oscillation loop comprises: according to the formula:
solving the minimum value of the isooctyl energy of the oscillation loop, wherein H is the isooctyl energy, s i Sum s j Representing the states of the two ibcin spins, respectively, with a preferred value of +1 or-1, the coupling matrices J and h are used to describe the combinatorial optimization problem.
(III) beneficial effects
The invention provides a coherent I Xin Ji, which uses random polarization states of polarized light with mutually orthogonal oscillation directions to represent two states of Ictan spin, and a generating device of linearly polarized light and microwave signals, a light splitting and logic operation device and the like are all photoelectric devices based on conventional use environments, so that the problem of combination optimization can be solved at room temperature.
The coherent IQ Xin Ji provided by the invention can realize ultra-large-scale IQ spin by means of the low-loss characteristic of a long optical fiber and the time multiplexing technology, has the characteristics of large bandwidth and electromagnetic interference avoidance, and simultaneously can bring high coherence characteristic to the coherent IQ Xin Ji by introducing a microwave signal with high coherence through a microwave signal generating module.
In another aspect, the present invention provides a method for solving the complex combinatorial optimization problem. Based on the coherent i Xin Ji provided by the invention, by means of the light splitting and logic operation module, the rapid programmable connection between any spins can be realized, and a pulse signal with a single polarization state is generated, at the moment, the system has minimum Icine energy, and corresponds to the minimum gain of the coherent i Xin Ji, and the minimum gain corresponds to the optimal solution of the combination optimization problem.
Drawings
FIG. 1 schematically illustrates a block diagram of a coherent i Xin Ji of one embodiment of the present invention;
FIG. 2 schematically illustrates a block diagram of a coherent i Xin Ji in accordance with another embodiment of the present invention;
FIG. 3 schematically illustrates a block diagram of a coherent i Xin Ji in accordance with yet another embodiment of the present invention;
fig. 4 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention;
fig. 5 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention;
fig. 6 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention;
fig. 7 schematically illustrates a block diagram of a coherent i Xin Ji in accordance with yet another embodiment of the present invention;
FIG. 8 schematically illustrates a flow chart of a method of solving the complex combinatorial optimization problem in accordance with an embodiment of the present invention.
[ reference numerals description ]
1-pulse laser
2-polarization controller
3-polarization modulator
4-wave plate
5-first optocoupler
6-analyzer
7-Long optical fiber
8-photoelectric detector
8 a-first photodetector
8 b-second photodetector
8 c-third photodetector
9-fourth photodetector
10-wave filter
11-polarization beam splitter prism
12-analog-to-digital converter
13-logic operation unit
14-D/A converter
15-second optocoupler
16-third optocoupler
17-amplifier
18 a-first mixer
18 b-second mixer
19 a-first adjustable delay line
19 b-second adjustable delay line
A-linearly polarized light generating module
B-microwave signal generating module
C-beam splitting and logic operation module
D-logic operation module
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In the drawings or description, like or identical parts are provided with the same reference numerals. Features of the embodiments illustrated in the description may be combined freely to form new solutions without conflict, in addition, each claim may be used alone as one embodiment or features of the claims may be combined as a new embodiment, and in the drawings, the shape or thickness of the embodiments may be enlarged and labeled in a simplified or convenient manner. Furthermore, elements or implementations not shown or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, although examples of parameters including particular values may be provided herein, it should be appreciated that the parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error margins or design constraints.
The various embodiments of the invention described above may be freely combined to form further embodiments, unless otherwise technically impaired or contradictory, which are all within the scope of the invention.
Although the present invention has been described with reference to the accompanying drawings, the examples disclosed in the drawings are intended to illustrate preferred embodiments of the invention and are not to be construed as limiting the invention. The dimensional proportions in the drawings are illustrative only and should not be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Fig. 1 schematically illustrates a block diagram of a coherent i Xin Ji of one embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 1, the coherent i Xin Ji may include, for example: the linearly polarized light generating module A is used for generating first linearly polarized light; the microwave signal generation module B is used for generating a microwave signal; the light splitting and logic operation module C is used for generating a feedback signal; a polarization modulator 3 for modulating the first linearly polarized light by using the microwave signal and the feedback signal to obtain a second linearly polarized light, wherein the polarization state of the second linearly polarized light is periodically changed; a wave plate 4 for converting the second linearly polarized light into third linearly polarized light, the oscillation directions of the third linearly polarized light being orthogonal to each other; the first optical coupler 5 is used for splitting the third linearly polarized light, one beam is input into the microwave signal generating module B, and the other beam is input into the light splitting and logic operation module C; the microwave signal generation module B is used for converting one beam of third linearly polarized light into a microwave signal, the light splitting and logic operation module C is used for splitting the other beam of third linearly polarized light to obtain fourth linearly polarized light and fifth linearly polarized light, and the intensity of the fourth linearly polarized light is larger than that of the fifth linearly polarized light; the light splitting and logic operation module C is also used for generating a feedback signal through logic operation and inputting the feedback signal into the polarization modulator 3, wherein the polarization modulator 3 is used for enhancing fourth linear polarized light according to the feedback signal, weakening fifth linear polarized light and circularly modulating to obtain a pulse signal in a single polarization state.
According to an embodiment of the present invention, as shown in fig. 1, the light splitting and logic operation module C may, for example, include: the polarization splitting prism 11, the photoelectric detection device 8 and the logic operation module D, wherein the polarization splitting prism 11 is used for splitting another beam of third linearly polarized light, the photoelectric detection device 8 is used for converting fourth linearly polarized light and fifth linearly polarized light into a first electric signal and a second electric signal respectively, and the logic operation module D is used for carrying out logic operation on the first electric signal and the second electric signal and generating a feedback signal.
According to an embodiment of the present invention, as shown in fig. 1, the microwave signal generating module B may include, for example: an analyzer 6, a long optical fiber 7 and a fourth photodetector 9; wherein the analyzer 6 is configured to convert a third linearly polarized light beam into an intensity modulated light beam; the long optical fiber 7 can be a low-loss energy storage element, so that the noise performance of the photoelectric oscillator is improved, the long optical fiber 7 is used for storing intensity-modulated light to prolong the transmission time of the intensity-modulated light, and meanwhile, a time division multiplexing technology is utilized to realize large-scale pulse signals in a single polarization state, so that the problem of large-scale combination optimization is solved; the fourth photodetector 9 is used to convert the intensity modulated light into a third electrical signal.
According to an embodiment of the present invention, as shown in fig. 1, the logic operation module D may include, for example: the analog-digital converter 12, the logic operation unit 13 and the digital-analog converter 14, wherein the analog-digital converter 12 is used for converting the first electric signal and the second electric signal into the first digital signal and the second digital signal, the logic operation unit 13 is used for inputting the problem to be optimized, and is used for processing the first digital signal and the second digital signal to judge the intensity of the fourth linear polarized light and the fifth linear polarized light so as to obtain the current polarization state, namely the state of the Ictane spin, and generating a feedback signal, and the digital-analog converter 14 is used for converting the feedback signal into an analog signal and then transmitting the analog signal to the polarization modulator 3; the logic operation unit 13 may include, for example, any one of a CPU (central processing unit), an FPGA (field programmable gate array), a GPU (graphics processor) or an ASIC (application specific integrated circuit), and other units that can perform logic operations.
Fig. 2 schematically shows a block diagram of a coherent i Xin Ji in accordance with another embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 1, the coherent i Xin Ji may further include, for example: at least one filter 10, the filter 10 being, for example, an electrical filter for filtering electrical signals transmitted in the electrical circuit, or, as shown in fig. 2, the filter 10 being, for example, an optical filter for filtering optical signals transmitted in the optical path. The electric filter and the optical filter may be used at the same time.
Fig. 3 and 4 schematically show block diagrams of coherent i Xin Ji in accordance with two further embodiments of the present invention.
According to an embodiment of the invention, the photo detection means 8 may for example comprise a first photo detector 8a and a second photo detector 8b connected in parallel, as shown in fig. 3, or the photo detection means 8 may for example comprise a third photo detector 8c of two channels, as shown in fig. 4.
According to an embodiment of the present invention, as shown in fig. 1, the linearly polarized light generating module a may include, for example: a pulse laser 1 and a polarization controller 2, wherein the pulse laser 1 is used for generating laser pulse signals, each light pulse represents one Icine spin, and the polarization controller 2 is used for converting the laser pulse signals into first linearly polarized light; the optical path of the transmitted optical signal of coherent i Xin Ji includes at least one polarization controller 2, i.e. in addition to the polarization controller 2 in the linearly polarized light generating module a, further polarization controllers may be added to the optical path of coherent i Xin Ji to control the polarization state of the light.
According to embodiments of the present invention, the pulsed laser 1 may be replaced by an electrical pulse signal modulated direct modulation laser or a continuous light laser powered pulse signal modulated electro-optical modulator, as well as other ways in which periodic pulse signals may be generated.
Fig. 5 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 5, the microwave signal generating module B may further include: the second optical coupler 15 and the third optical coupler 16 may include at least two adjustable delay lines, for example, a first adjustable delay line 19a and a second adjustable delay line 19b, for improving coherence and frequency characteristics of the optoelectronic oscillator loop, where the second optical coupler 15 is configured to divide the intensity-modulated light into at least two optical signals, and combine the at least two optical signals through the third optical coupler 16 after delaying the at least two optical signals respectively. That is, the optoelectronic oscillator loop may be any one of a single loop, a dual loop, or a multiple loop.
According to the embodiment of the present invention, in the embodiment shown in fig. 5, the intensity-modulated light output by the analyzer 6 is split by the second optical coupler 15, delayed by the first adjustable delay line 19a and the second adjustable delay line 19b, coupled by the third optical coupler 16, and output the coupled optical signal to the long optical fiber 7, and further, the fourth optical detector 9 performs photoelectric conversion, or may split the optical signal output by the long optical fiber 7, and after delay, each path of delayed optical signal is converted into an electrical signal by the photoelectric detector, and then each path of electrical signal is coupled into one path of electrical signal by the electric coupler.
Fig. 6 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 6, the coherent isooctane machine may further include: at least one amplifier 17 for signal amplification of the first linearly polarized light and/or the microwave signal and/or the second linearly polarized light and/or the third linearly polarized light, the amplifier 17 comprising an optical amplifier and/or an electrical amplifier to increase the loop gain and facilitate the start of oscillation. The amplifier in fig. 6 is an electrical amplifier located in a circuit that transmits electrical signals. The amplifier 17 may be provided in the optical path for transmitting the optical signal or in both the circuit and the optical path.
According to an embodiment of the present invention, the coherent ife Xin Jigong process of the present invention based on light-based random polarization oscillation may be, for example: the pulse laser 1, the polarization controller 2, the polarization modulator 3, the wave plate 4, the first optical coupler 5, the analyzer 6, the long optical fiber 7, the fourth photoelectric detector 9, the filter 10 and the amplifier 17 form a photoelectric oscillator loop for generating photoelectric oscillation and maintaining the whole loop in an oscillation state all the time; the other path of output light of the first optical coupler 5 is input into the polarization splitting prism 11 to be split into two beams of linearly polarized light with mutually orthogonal polarization states, the two beams of linearly polarized light are detected by the first photoelectric detector 8a and the second photoelectric detector 8b respectively, the two beams of linearly polarized light are detected and operated by the analog-to-digital converter 12, the logic operation unit 13 and the digital-to-analog converter 14, the two beams of linearly polarized light are finally fed back to the bias control port of the polarization modulator 3, feedback control on the polarization state of the oscillating light in the loop is realized, and finally the aim of solving the combination optimization problem is achieved.
According to an embodiment of the invention, as shown in fig. 6, the invention may be, for example, a coherent i Xin Ji based on random polarization oscillations of light, which coherent i Xin Ji based on random polarization oscillations of light may, for example, comprise: the pulse laser device comprises a pulse laser 1, a polarization controller 2, a polarization modulator 3, a wave plate 4, a first optical coupler 5, an analyzer 6, a long optical fiber 7, a first photoelectric detector 8a, a second photoelectric detector 8b and a fourth photoelectric detector 9, a filter 10, an amplifier 17, a polarization beam splitter prism 11, an analog-to-digital converter 12, a logic operation unit 13 and a digital-to-analog converter 14; the pulse laser 1, the polarization controller 2, the polarization modulator 3, the wave plate 4, the first optical coupler 5, the analyzer 6, the long optical fiber 7 and the fourth photoelectric detector 9 are connected through optical fiber jumpers in sequence; the first optical coupler 5, the polarization beam splitter prism 11 and the first photoelectric detector 8a are connected through optical fiber jumpers in sequence; the polarization beam splitter prism 11 and the second photoelectric detector 8b are connected through an optical fiber jumper; the fourth photoelectric detector 9, the filter 10, the amplifier 17 and the polarization modulator 3 are connected through cables in sequence; the first photoelectric detector 8a, the analog-to-digital converter 12, the logic operation unit 13, the digital-to-analog converter 14 and the polarization modulator 3 are connected through cables in sequence; the second photodetector 8b is connected to the analog-to-digital converter 12 via a cable.
According to the embodiment of the invention, more polarization controllers can be added at any position in the optical path connected by the optical cable for adjusting the polarization direction of the light beam.
According to an embodiment of the invention, the waveplate 4 may be, for example, a 1/4 waveplate. The pulse laser 1 emits laser pulses, each laser pulse represents one Icine spin, the laser pulse is changed into linearly polarized light after passing through the polarization controller 2 and is input into the polarization modulator 3, and the polarization state of the linearly polarized light is periodically changed after being modulated by the polarization modulator 3; the periodically-changing polarized light is input into the 1/4 wave plate, wherein the optical axis of the 1/4 wave plate is consistent with the optical axis of the polarization controller 2, so that the output light after the 1/4 wave plate is linearly polarized light oscillating in two mutually orthogonal directions; the linearly polarized light is divided into two beams by a first optical coupler 5, one beam is input into an analyzer 6, and the other beam is input into a polarization splitting prism 11; the polarized light after passing through the analyzer 6 is converted into intensity modulated light, and the intensity modulated light signal is transmitted through the long optical fiber 7 and then converted into a microwave signal through the fourth photodetector 9; the microwave signal is filtered and amplified by the electric filter and the electric amplifier and then fed back to the polarization modulator 3, when the loop gain is larger than the loss, the microwave frequency meeting the oscillation condition will oscillate in the loop, thus forming the photoelectric oscillator loop. The long optical fiber is used in the loop, so that the loop has longer loop cavity delay, so that a large number of laser pulses, namely the Icine spins, can be stored in the loop, and the capability of solving the problem of large-scale combination optimization is realized. Input polarization beam splittingThe light of the prism 11 is split into two beams, the two beams are detected by the first photodetector 8a and the second photodetector 8b, respectively, the optical axis of the polarization splitting prism is adjusted so that two linearly polarized light beams oscillating in orthogonal directions are split and are detected by the two photodetectors 8a and 8b, respectively, and then become microwave signals, at this time, the intensities of the microwave signals output by the first photodetector 8a and the second photodetector 8b represent the intensities of the linearly polarized light beams in the two polarization directions, respectively; the two paths of microwave signals are input into the two-channel analog-to-digital converter 12, the two paths of microwave signals are converted into two paths of digital signals by the analog-to-digital converter 12, the two paths of digital signals are simultaneously input into the logic operation unit 13, the logic operation unit 13 compares the input two paths of digital signals to obtain the polarization direction of linearly polarized light with higher intensity, and for the ith laser pulse, s is when the linearly polarized light in a certain polarization direction is stronger i Takes +1, s when linear polarized light in a direction perpendicular thereto is stronger i Taking-1, the polarization states of all pulses in the detection loop get a matrix s describing the current Icine spin state. In addition, the logic operation unit 13 stores matrices J and h describing the problem to be optimized, and after the current Icine spin state matrix s is obtained, the logic operation unit 13 performs operation to obtain a feedback signal to be output. The feedback signal is input to the digital-to-analog converter 14 and converted into an analog signal to be input to the bias control port of the polarization modulator 3, so that feedback control of the polarization state of the light beam oscillated in the loop is realized. Each pulse in the loop after stable oscillation has only one polarization state, namely, the intensity of linear polarized light in a certain direction is strongest and the intensity of linear polarized light in a direction perpendicular to the direction is 0. Finally, after the loop forms stable oscillation, the state of the Icine spin corresponding to the polarization state of each pulse in the loop is the solution of the problem to be optimized.
Fig. 7 schematically shows a block diagram of a coherent i Xin Ji of yet another embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 7, the light splitting and logic operation module C further includes: the first mixer 18a and the second mixer 18b are respectively connected with the input and the output of the logic operation module D, the first mixer 18a is used for mixing the first electric signal and the second electric signal, and the second mixer 18b is used for mixing the feedback signal.
According to the embodiment of the invention, the first mixer 18a and the second mixer 18b can be respectively added before the analog-to-digital converter 12 and after the digital-to-analog converter 14 to realize the down conversion and the up conversion of the microwave frequency, so that the problem of insufficient sampling rate of the analog-to-digital converter 12 and the digital-to-analog converter 14 is solved.
In summary, the embodiment of the present invention proposes a coherent i Xin Ji. By generating linearly polarized light with mutually orthogonal oscillation directions and splitting the linearly polarized light with mutually orthogonal oscillation directions, one beam is converted into a large-scale and high-coherence microwave signal through the time division multiplexing action of a low-loss long optical fiber to maintain the oscillation state of a photoelectric oscillator loop, the other beam is subjected to programmable logic operation to obtain a feedback signal for controlling the polarization state of an optical pulse, and the two polarization states of the optical pulse can be used for representing the two spin states of an Icine spin, so that the high-coherence, large-scale and programmable organic combination of coherent I Xin Ji can be realized through the coherent I Xin Ji.
FIG. 8 schematically illustrates a flow chart of a method of solving the complex combinatorial optimization problem in accordance with an embodiment of the present invention.
Another aspect of the embodiments of the present invention provides a solution to the problem of combinatorial optimization, as shown in fig. 8, where the method includes:
s801, two oscillation directions using the third linearly polarized light represent two spin states of the isooctyl spin, respectively.
S802, the combination optimization problem is mapped into gain and loss states of the oscillation loop.
S803, solving the minimum value of the Ictan energy of the oscillation loop to obtain an optimal solution of the combined optimization problem.
Wherein solving for the minimum value of the isooctyl energy of the oscillation loop comprises: according to the formula:
H＝∑ i h i s i +∑ i，j J ij s i s j (1)
solving for the Icine energy of an oscillation loopMinimum value, where H is the energy of the isooctane, s i Sum s j Representing the states of the two ibcin spins, respectively, with a preferred value of either +1 or-1, the coupling matrices J and h are used to describe the combinatorial optimization problem.
According to an embodiment of the present invention, the optical axis of the polarization controller 2 is at 0 degrees or 90 degrees to the optical axis of the wave plate 4, and the light after the wave plate 4 is linearly polarized light oscillating in two mutually orthogonal directions. The two directions of linearly polarized light oscillation can respectively represent two spin states of the Icine spin, and the problem to be optimized is mapped into the gain and loss states of the oscillation loop, wherein the optimal solution of the problem to be optimized corresponds to the lowest loss point of the oscillation loop. That is, after the loop of coherent i Xin Ji provided in the embodiment of the present application forms stable oscillation, each pulse has only one polarization state, and the state of the isooctyl spin corresponding to the polarization state of each pulse in the loop is the solution of the problem to be optimized.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (10)
1. A coherent i Xin Ji, comprising:
a linearly polarized light generating module (a) for generating a first linearly polarized light;
a microwave signal generation module (B) for generating a microwave signal;
the light splitting and logic operation module (C) is used for generating a feedback signal;
a polarization modulator (3) for modulating the first linearly polarized light by using the microwave signal and the feedback signal to obtain second linearly polarized light, wherein the polarization state of the second linearly polarized light is periodically changed;
a wave plate (4) for converting the second linearly polarized light into third linearly polarized light, the oscillation directions of the third linearly polarized light being mutually orthogonal;
a first optical coupler (5) for splitting the third linearly polarized light, one beam being input to the microwave signal generating module (B) and the other beam being input to the light splitting and logic operation module (C);
the microwave signal generating module (B) is used for converting one beam of the third linearly polarized light into the microwave signal, the light splitting and logic operation module (C) is used for splitting the other beam of the third linearly polarized light to obtain fourth linearly polarized light and fifth linearly polarized light, and the intensity of the fourth linearly polarized light is larger than that of the fifth linearly polarized light; the light splitting and logic operation module (C) is further used for generating the feedback signal through logic operation and inputting the feedback signal into the polarization modulator (3), wherein the polarization modulator (3) is used for enhancing the fourth linearly polarized light, weakening the fifth linearly polarized light and circularly modulating to obtain a pulse signal in a single polarization state.
2. The coherent i Xin Ji of claim 1, wherein said spectral and logic operation module (C) comprises:
the photoelectric detection device comprises a polarization beam splitting prism (11), a photoelectric detection device (8) and a logic operation module (D), wherein the polarization beam splitting prism (11) is used for splitting another beam of third linearly polarized light, the photoelectric detection device (8) is used for converting fourth linearly polarized light and fifth linearly polarized light into a first electric signal and a second electric signal respectively, and the logic operation module (D) is used for carrying out logic operation on the first electric signal and the second electric signal and generating the feedback signal.
3. The coherent i Xin Ji of claim 1, wherein said microwave signal generation module (B) comprises:
an analyzer (6), a long optical fiber (7) and a fourth photodetector (9);
wherein the analyzer (6) is configured to convert a beam of the third linearly polarized light into intensity modulated light;
the long optical fiber (7) is used for storing the intensity-modulated light to prolong the transmission time of the intensity-modulated light, and simultaneously, a time division multiplexing technology is utilized to realize large-scale pulse signals in the single polarization state;
the fourth photodetector (9) is for converting the intensity modulated light into a third electrical signal.
4. The coherent i Xin Ji of claim 1, wherein the coherent i Xin Ji further comprises:
-a filter (10), the filter (10) being an electrical filter for filtering an electrical signal transmitted in an electrical circuit or an optical filter for filtering an optical signal transmitted in an optical path.
5. The coherent i Xin Ji of claim 2, wherein the logic operation module (D) comprises:
an analog-to-digital converter (12), a logic operation unit (13) and a digital-to-analog converter (14), wherein the analog-to-digital converter (12) is used for converting the first electric signal and the second electric signal into a first digital signal and a second digital signal, the logic operation unit (13) is used for processing the first digital signal and the second digital signal to judge the intensity of the fourth linearly polarized light and the fifth linearly polarized light and generate the feedback signal, and the digital-to-analog converter (14) is used for converting the feedback signal into an analog signal and then transmitting the analog signal to the polarization modulator (3);
the logic operation unit (13) comprises any one of a CPU, an FPGA, a GPU or an ASIC.
6. A coherent i Xin Ji according to claim 2, characterized in that the photo detection means (8) comprises a first photo detector (8 a) and a second photo detector (8 b) in parallel, or a two-channel third photo detector (8 c).
7. A coherent i Xin Ji according to claim 1, characterized in that said linearly polarized light generating module (a) comprises:
a pulse laser (1) and a polarization controller (2), wherein the pulse laser (1) is used for generating a laser pulse signal, and the polarization controller (2) is used for converting the laser pulse signal into the first linearly polarized light;
the optical path of the transmission optical signal of the coherent light Xin Ji comprises at least two polarization controllers (2).
8. A coherent i Xin Ji according to claim 3, wherein the microwave signal generation module (B) further comprises:
the second optical coupler (15) is used for dividing the intensity-modulated light into at least two light signals, and the at least two light signals are respectively delayed and then are combined through the third optical coupler (16).
9. The coherent i Xin Ji according to claim 2, further comprising in said coherent i Xin Ji:
-at least one amplifier (17) for signal amplification of said first linearly polarized light and/or said microwave signal and/or said second linearly polarized light and/or said third linearly polarized light, said amplifier (17) comprising an optical amplifier and/or an electrical amplifier;
the light splitting and logic operation module (C) further comprises:
a first mixer (18 a) and a second mixer (18 b), the first mixer (18 a) and the second mixer (18 b) being connected to the input and the output of the logic operation module (D), respectively, the first mixer (18 a) being configured to mix the first electrical signal and the second electrical signal, and the second mixer (18 b) being configured to mix the feedback signal.
10. A method of solving the combinatorial optimization problem of coherent i Xin Ji according to any one of claims 1-9, comprising:
using the two oscillation directions of the third linearly polarized light to represent two spin states of the Icine spin respectively;
mapping the combined optimization problem into gain and loss states of an oscillation loop;
solving the minimum value of the isooctyl energy of the oscillation loop to obtain an optimal solution of the combined optimization problem;
wherein said solving for a minimum value of the isooctyl energy of the oscillation loop comprises:
according to the formula:
solving a minimum value of the isooctyl energy of the oscillation loop, wherein H is the isooctyl energy, s i Sum s j Representing the states of the two ibcin spins, respectively, with a preferred value of +1 or-1, the coupling matrices J and h are used to describe the combination optimization problem.
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| WO2017047666A1 (en) * | 2015-09-15 | 2017-03-23 | 日本電信電話株式会社 | Ising model quantum calculation device |
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| CN109616520A (en) * | 2019-01-17 | 2019-04-12 | 中国科学技术大学 | Microwave cavity couples self-organizing germanium silicon nanowires quantum dot device |
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| WO2017044077A1 (en) * | 2015-09-08 | 2017-03-16 | Hewlett Packard Enterprise Development Lp | Apparatus for solving ising problems |
| WO2017047666A1 (en) * | 2015-09-15 | 2017-03-23 | 日本電信電話株式会社 | Ising model quantum calculation device |
| CA3102913A1 (en) * | 2017-07-13 | 2019-01-17 | President And Fellows Of Harvard College | Neutral atom quantum information processor |
| CN109616520A (en) * | 2019-01-17 | 2019-04-12 | 中国科学技术大学 | Microwave cavity couples self-organizing germanium silicon nanowires quantum dot device |
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