CN113776665A - Detection efficiency testing device and method for single photon detector in communication waveband - Google Patents
Detection efficiency testing device and method for single photon detector in communication waveband Download PDFInfo
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Abstract
The invention provides a device and a method for testing the detection efficiency of a single photon detector in a communication waveband, and the specific test principle is as follows: spontaneous parametric radiation processes in a nonlinear optical medium can generate associated photon pairs with a certain probability, namely, one high-frequency photon is annihilated while two low-frequency photons are generated, and the existence of the other photon can be forecasted by detecting one photon by utilizing the relevance of the associated photon pair in the aspects of time, energy (frequency), momentum, polarization and the like. And measuring the two paths of single photon counting signals by utilizing coincidence measurement, wherein the obtained coincidence measurement value is the counting signal of the two paths of photons which are simultaneously detected, and the detection efficiency of the single photon detector to be detected can be obtained by the coincidence measurement value, the trigger detection counting value and the light path transmittance of the photons detected by the detector to be detected. The invention is a reference type measuring scheme, does not need to trace to a higher-level metering standard, and has the characteristic of high precision in the quantum information technology.
Description
Technical Field
The invention belongs to the technical field of single photon detector testing, and particularly relates to a device and a method for testing the detection efficiency of a single photon detector in a communication waveband.
Background
Currently, the application of the single photon detector is mainly in the fields of quantum secure communication, quantum precision measurement, micro-light detection and the like, wherein the application of the single photon detector is most typical in the quantum secure communication terminal. The single photon detector performance characterization parameters mainly comprise dark counting, detection efficiency, linearity, rear pulse probability and the like, and the parameters directly influence the code rate, transmission distance and safety of quantum secret communication. The detection efficiency is used as a core parameter of the single photon detector, the current test scheme is that a quasi-single photon source generated by laser attenuation is used for exciting the single photon detector, the quasi-single photon source intensity is obtained by indirectly calculating after the output intensity of a laser source and the attenuation multiple of an attenuator are respectively calibrated by a standard power meter, and the measurement precision of the detection efficiency and the linearity is mainly determined by the measurement accuracy and the linearity of the standard power meter, so that the method is a test method which needs to trace to a higher-level standard. If measurement needs to be carried out at a plurality of communication wavelengths, instruments such as a plurality of light sources and corresponding standard power meters need to be matched. In addition, when the detection efficiency is measured by using the laser attenuation method, the photon count value includes the post-pulse count, and if the detection efficiency needs to be further accurately measured, the post-pulse count needs to be separately measured by using a time-dependent single photon count technology and the like.
Along with the development of quantum information technology, the requirements of mass production and wide application of single photon detectors on high accuracy, portability and automatic testing of the single photon detectors are more and more obvious, particularly, the measurement of the detection efficiency of core parameters is based on the traditional laser attenuation measurement scheme, and the measurement accuracy cannot be further improved due to the gradual accumulated errors in the mass transfer process.
At present, the mainstream test scheme of the detection efficiency of the single photon detector is to attenuate a laser source to a single photon magnitude, and indirectly calculate the quantity of emitted photons by calibrating the output power of a light source and the attenuation multiple of a large dynamic range through a standard power meter with excellent linear response, and the scheme has the advantages that: regardless of whether light source, optical attenuator or optical power meter all have more ripe product to be used for, one set of test system can be established after the product of different producers is collocated, but the shortcoming is also very obvious: firstly, the test system is composed of different discrete instruments, is not easy to carry, needs special development and design aiming at each instrument, and is difficult to realize automatic test; secondly, a single photon source is generated by attenuating a laser light source in a large dynamic range, the intensity, stability and optical filters of the laser light source are measured by a standard power meter, and because the optical power of a single photon level is extremely weak, a plurality of optical filters need to be measured independently and then are used in series, and measurement errors are accumulated continuously due to more measurement links, so that the measurement precision is very limited and is difficult to improve; the single photon detector is different from the traditional photoelectric detector, the working physical process is complex, all parameters are mutually related, for example, the detection efficiency measured by a laser attenuation method comprises the rear pulse probability, for example, the rear pulse probability is required to be tested, and a counting signal which accords with the record of a measuring instrument and is analyzed by the single photon detector to be tested is also required to be used, so that a complete set of test system needs to be formed by a plurality of sets of instruments with different types. This solution has generally failed to meet the increasing testing demands in terms of using portability, automating testing, and improving testing accuracy.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for testing the detection efficiency of a single photon detector in a communication waveband, wherein a set of test system is formed on the basis of a correlated photon source and a coincidence measuring instrument, and the device and the method are different from the traditional test thought.
The specific test principle is as follows: spontaneous parametric radiation processes in a nonlinear optical medium can generate associated photon pairs with a certain probability, namely, one high-frequency photon is annihilated while two low-frequency photons are generated, and the existence of the other photon can be forecasted by detecting one photon by utilizing the relevance of the associated photon pair in the aspects of time, energy (frequency), momentum, polarization and the like. And measuring the two paths of single photon counting signals by utilizing coincidence measurement, wherein the obtained coincidence measurement value is the counting signal of the two paths of photons which are simultaneously detected, and the detection efficiency of the single photon detector to be detected can be obtained by the coincidence measurement value, the trigger detection counting value and the light path transmittance of the photons detected by the detector to be detected.
The technical scheme of the invention is as follows: a detection efficiency testing device of a single photon detector in a communication waveband comprises a correlated photon source, a trigger signal unit, a measurement conforming unit and a corresponding control, measurement and display unit; during testing: the method comprises the steps that a correlated photon source generates two photon signals, one path of the narrow-band light signal is incident to a trigger detector, one path of the wide-band light signal is incident to a detector to be detected, if the trigger detector and the detector to be detected work in a Geiger mode, synchronous detection of photons is achieved by adjusting detection time delay of the trigger detector and the detector to be detected through the trigger signal, output counting signals of the trigger detector and the detector to be detected are connected into a coincidence measurement unit, the coincidence counting unit records coincidence counting values of the two paths of counting signals at different time difference positions to obtain a coincidence main peak value, the output counting value of the trigger single photon detector is recorded at the same time, and the detection efficiency of the single photon detector to be detected is obtained by dividing the coincidence counting main peak value by the trigger detector and the channel transmittance of the single photon detector to be detected.
In the above, the correlated photon source is configured to generate a correlated photon pair for exciting a detector to be tested and triggering the detector, and includes: picosecond short pulse light source, adjustable attenuator, periodic polarization waveguide, 1550/1310 wavelength division multiplexing, 1550nm broadband filter, 1310nm broadband filter, 1 x 2 optical switch, 1550nm band tunable narrow-band filter, 1310nm band tunable narrow-band filter, all of which are connected by optical fiber.
In the above, the picosecond short pulse light source is used for generating a broadband associated photon pair by the pump light source entering the periodic polarization waveguide, the periodic polarization waveguide integrates a temperature control unit, and the spectrum of the associated photon is moved to a short wave or a long wave within a certain spectrum range by adjusting the working temperature of the waveguide.
In the above, the adjustable attenuator is used to adjust the light intensity of the incident light signal.
In the above, the periodically polarized waveguide is used as a nonlinear medium for generating a photon pair associated with a communication band.
The 1550/1310 WDM is used to separate the photons associated with the 1550nm band and the 1310nm band and to perform preliminary filtering on the pump light source.
In the above, the 1550nm broadband filter and the 1310nm broadband filter are used to further suppress the pump light source and the non-associated photons.
In the above, the 1550nm band tunable narrowband filter and the 1310nm band tunable narrowband filter are used for narrowband filtering of associated photons, and the filtering center wavelength and the bandwidth are adjustable; the trigger signal unit is used for triggering the picosecond short pulse light source, the single photon detector to be detected and the single photon detector, and adjusting time delay among three paths of trigger signals to enable the three paths of trigger signals to work synchronously; the coincidence measurement unit is used for performing coincidence measurement on the counting signals of the two paths of single photon detectors; the control, measurement and display unit is used for setting the test parameters of the test device and analyzing and displaying the measurement results.
The invention also provides a method for testing the detection efficiency of the single photon detector in the communication waveband, which comprises the following steps:
step 1: the correlated photon source generates two paths of communication waveband photon signals, one path of the narrow-band optical signal is incident to a trigger detector, the trigger detector is a trigger single photon detector, and one path of the wide-band optical signal is incident to a single photon detector to be detected;
step 2: setting a trigger detector and a detector to be detected to work in a Geiger mode, adjusting the detection time delay of the trigger detector and the detector to be detected by a trigger signal to realize synchronous detection of photons, and accessing output counting signals of the trigger detector and the detector to be detected to a coincidence measurement unit;
and step 3: the coincidence measurement unit records coincidence count values of the two paths of counting signals at different time difference values to obtain a coincidence main peak value, simultaneously records an output count value of the trigger single-photon detector, and divides the coincidence main peak value by the count value of the trigger single-photon detector and the channel transmittance of the single-photon detector to be detected to obtain the detection efficiency of the single-photon detector to be detected.
In the above method, in step 2, the step of implementing synchronous detection of photons by using the trigger signal includes: setting the working gate width and detection efficiency or bias voltage of the two detectors, adjusting the time delay among the signals by the trigger signal unit, synchronizing the associated photon source, the detector to be detected and the trigger detector to maximize the count value of the two detectors, respectively accessing the count signals of the two detectors into the start and stop channels conforming to the measurement unit, and analyzing the coincidence measurement histogram of the two paths of count signals to obtain a coincidence count value McSimultaneously recording the count value M of the trigger detectortriggerAnd the calculation formula of the detection efficiency eta of the single photon detector to be detected is formula (1):
and tau is the integral transmittance of the associated photons from the waveguide to the single photon detector to be tested.
Specifically, when the detection efficiency is measured at different wave bands, the filtering channels of the associated photon sources are switched, and the trigger signal and the coincidence measurement unit are not changed along with the change of the measurement wavelength. When the single photon detector to be detected measures the detection efficiency at 1550nm band, the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) in the correlated photon source are switched to output the optical signal through the 1550nm band broadband filter and to inject the optical signal into the single photon detector to be detected, and the 1 × 2 optical switch (iii) and the 1 × 2 optical switch (iv) are switched to output the optical signal through the 1310nm band tunable narrow band filter and to inject the optical signal into the single photon detector to trigger the single photon detector. Because the pump light source has a certain bandwidth, the bandwidth of the 1310nm band tunable narrow-band filter is usually set to-1 nm, the bandwidth of the 1550nm band wide-band filter is set to-10 nm, and a bandwidth ratio of about 10:1 substantially contains 1550nm band photons associated with the 1310nm band narrow-band filtered photons. Similarly, when the single photon detector to be measured measures the detection efficiency at 1310nm band, the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) in the correlated photon source are switched to output the optical signal through the 1550nm band tunable narrow band filter and inject the optical signal to trigger the single photon detector, and the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) are switched to output the optical signal through the 1310nm band wide band filter and inject the optical signal into the single photon detector to be measured, wherein the 1310nm band wide band filter has a bandwidth set to 10nm and the 1550nm band tunable narrow band filter has a bandwidth set to 1 nm.
The technical scheme adopted by the invention is as follows: 1. the invention provides a single photon detector detection efficiency testing method based on a correlated photon source, which can measure the detection efficiency of a single photon detector at two wavelengths of a communication waveband at the same time. The single photon detector detection efficiency is measured based on the measurement scheme provided by the invention, the measurement accuracy is determined by the parameters of the device, the method is different from the existing laser attenuation test scheme which needs to trace to an external higher-level measurement standard, and the post-pulse probability correction is not needed. 2. The testing device provided by the invention can realize automatic testing of the detection efficiency and linearity of the single photon detector, and is plug-and-play, efficient and convenient. 3. The associated photon source generates two communication waveband photon signals simultaneously, and the detection efficiency at two wavelengths can be measured simultaneously by switching broadband/narrowband filtering. 4. Compared with the existing laser attenuation test scheme, the method has higher test precision on the measurement of the detection efficiency, and the measurement of the detection efficiency corrects the rear pulse probability.
Drawings
FIG. 1 is a schematic diagram of measurement of detection efficiency of a single photon detector in a communication waveband.
FIG. 2 is a schematic diagram of the composition of an associated photon source according to the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
One embodiment of the invention provides a device and a method for testing the detection efficiency of a single-photon detector in a communication waveband, which can measure the detection efficiency of the single-photon detector at two wavelengths in the communication waveband simultaneously. The single photon detector detection efficiency is measured based on the measurement scheme provided by the invention, the measurement accuracy is determined by the parameters of the device, and the method is different from the existing test scheme which needs to trace the source to the higher-level external measurement standard.
Example one
In order to achieve the above purpose, as shown in fig. 1, the dotted line in fig. 1 represents an optical signal, and the solid line represents an electrical signal, the technical solution adopted by the present invention is: the utility model provides a communication wave band single photon detector detection efficiency testing arrangement, includes: the correlated photon source triggers the signal unit, accords with the measuring unit and corresponding control, measurement and display unit; during testing: the method comprises the steps that a correlated photon source generates two photon signals, one path of the narrow-band light signal is incident to a trigger detector, one path of the wide-band light signal is incident to a detector to be detected, if the trigger detector and the detector to be detected work in a Geiger mode, synchronous detection of photons is achieved by adjusting detection time delay of the trigger detector and the detector to be detected through the trigger signal, output counting signals of the trigger detector and the detector to be detected are connected into a coincidence measurement unit, the coincidence counting unit records coincidence counting values of the two paths of counting signals at different time difference positions to obtain a coincidence main peak value, the output counting value of the trigger single photon detector is recorded at the same time, and the detection efficiency of the single photon detector to be detected is obtained by dividing the coincidence counting main peak value by the trigger detector and the channel transmittance of the single photon detector to be detected.
The correlated photon source is used for generating correlated photon pairs for exciting a detector to be detected and triggering the detector, and the correlated photon source is composed of the following components shown in fig. 2, and comprises the following components: picosecond short pulse light source, adjustable attenuator, periodic polarization waveguide, 1550/1310 wavelength division multiplexing, 1550nm broadband filter, 1310nm broadband filter, 1 x 2 optical switch, 1550nm band tunable narrow-band filter, 1310nm band tunable narrow-band filter, all of which are connected by optical fiber.
The picosecond short pulse light source is used as a pump light source to enter the periodic polarization waveguide to generate a broadband associated photon pair, the periodic polarization waveguide is integrated with a temperature control unit, and the spectrum of the associated photon can move to short wave or long wave in a certain spectral range by adjusting the working temperature of the waveguide.
The adjustable attenuator is used for adjusting the light intensity of the incident light signal.
The periodically polarized waveguide is used as a nonlinear medium for generating a communication waveband-associated photon pair.
The 1550/1310 wavelength division multiplexing is used for separating photons associated with 1550nm band and 1310nm band and carrying out preliminary filtering on the pump light source.
The 1550nm broadband filter and the 1310nm broadband filter are used for further inhibiting the pump light source and the non-associated photons.
The 1 × 2 optical switch is used for switching optical paths.
The 1550nm band tunable narrow-band filter and the 1310nm band tunable narrow-band filter are used for narrow-band filtering of associated photons, and the filtering center wavelength and the bandwidth are adjustable.
The trigger signal unit is used for triggering the picosecond short pulse light source, the single photon detector to be detected and the single photon detector, and adjusting time delay among the three trigger signals to enable the three trigger signals to work synchronously.
And the coincidence measurement unit is used for performing coincidence measurement on the counting signals of the two single photon detectors.
The control, measurement and display unit is used for setting the test parameters of the test device and analyzing and displaying the measurement results.
Example two
On the basis of the embodiment, further, the correlated photon source generates two paths of photon signals, one path of the narrow-band optical signal is incident to the trigger detector, the trigger detector is a trigger single-photon detector, one path of the wide-band optical signal is incident to the detector to be detected, if the trigger detector and the detector to be detected both work in a geiger mode, synchronous detection of photons is realized by adjusting the detection time delay of the trigger and the detector to be detected through the trigger signal, the output counting signals of the trigger detector and the detector to be detected are accessed into the coincidence measurement unit, the coincidence measurement unit records coincidence counting values of the two paths of counting signals at different time difference values to obtain a coincidence main peak value, and simultaneously recording an output count value of the trigger single-photon detector, and dividing the count value of the trigger single-photon detector and the channel transmittance of the to-be-detected single-photon detector by the coincidence counting main peak value to obtain the detection efficiency of the to-be-detected single-photon detector.
In the above, the specific steps of implementing synchronous detection of photons by using the trigger signal are as follows: setting the working gate width and detection efficiency (or bias voltage) of the two detectors, adjusting the time delay among the signals by the trigger signal unit, synchronizing the associated photon source, the detector to be detected and the trigger detector to maximize the count value of the two detectors, respectively accessing the count signals of the two detectors into the start and stop channels conforming to the measurement unit, and analyzing the coincidence measurement histogram of the two count signals to obtain a coincidence count value McSimultaneously recording the count value M of the trigger detectortriggerAnd the calculation formula of the detection efficiency eta of the single photon detector to be detected is formula (1):
and tau is the integral transmittance of the associated photons from the waveguide to the single photon detector to be tested.
Specifically, when the single photon detector to be detected measures the detection efficiency at 1550nm band, the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) are switched to output an optical signal through the 1550nm band broadband filter and to inject the optical signal into the single photon detector to be detected, and the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) are switched to output the optical signal through the 1310nm band tunable narrow band filter and to inject the optical signal into the single photon detector to be triggered. Because the pump light source has a certain bandwidth, the bandwidth of the 1310nm band tunable narrow-band filter is usually set to-1 nm, the bandwidth of the 1550nm band wide-band filter is set to-10 nm, and a bandwidth ratio of about 10:1 substantially contains 1550nm band photons associated with the 1310nm band narrow-band filtered photons. Similarly, when the single photon detector to be measured measures the detection efficiency at 1310nm band, the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) are switched to output an optical signal through the 1550nm band tunable narrow band filter and trigger the single photon detector by incidence, and the 1 × 2 optical switch (i) and the 1 × 2 optical switch (ii) are switched to output an optical signal through the 1310nm band wide band filter and enter the single photon detector to be measured, wherein the 1310nm band wide band filter is set to 10nm, and the 1550nm band tunable narrow band filter is set to 1 nm.
The technical scheme adopted by the invention is as follows: 1. the invention provides a single photon detector detection efficiency testing method based on a correlated photon source, which can measure the detection efficiency of a single photon detector at two wavelengths of a communication waveband at the same time. The single photon detector detection efficiency is measured based on the measurement scheme provided by the invention, the measurement accuracy is determined by the parameters of the device, the method is different from the existing laser attenuation test scheme which needs to trace to an external higher-level measurement standard, and the post-pulse probability correction is not needed. 2. The testing device provided by the invention can realize automatic testing of the detection efficiency and linearity of the single photon detector, and is plug-and-play, efficient and convenient. 3. The associated photon source generates two communication waveband photon signals simultaneously, and the detection efficiency at two wavelengths can be measured simultaneously by switching broadband/narrowband filtering. 4. Compared with the existing laser attenuation test scheme, the method has higher test precision on the measurement of the detection efficiency, and the measurement of the detection efficiency corrects the rear pulse probability.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A detection efficiency testing device of a single photon detector in a communication waveband is characterized by comprising a correlated photon source, a trigger signal unit, a measurement conforming unit and a corresponding control, measurement and display unit; during testing: the method comprises the steps that a correlated photon source generates two photon signals, one path of the narrow-band light signal is incident to a trigger detector, one path of the wide-band light signal is incident to a detector to be detected, if the trigger detector and the detector to be detected work in a Geiger mode, synchronous detection of photons is achieved by adjusting detection time delay of the trigger detector and the detector to be detected through the trigger signal, output counting signals of the trigger detector and the detector to be detected are connected into a coincidence measurement unit, the coincidence counting unit records coincidence counting values of the two paths of counting signals at different time difference positions to obtain a coincidence main peak value, the output counting value of the trigger single photon detector is recorded at the same time, and the detection efficiency of the single photon detector to be detected is obtained by dividing the coincidence counting main peak value by the trigger detector and the channel transmittance of the single photon detector to be detected.
2. The test apparatus of claim 1, wherein the correlated photon source for generating correlated pairs of photons for exciting the detector under test and triggering the detector, comprises: picosecond short pulse light source, adjustable attenuator, periodic polarization waveguide, 1550/1310 wavelength division multiplexing, 1550nm broadband filter, 1310nm broadband filter, 1 x 2 optical switch, 1550nm band tunable narrow-band filter, 1310nm band tunable narrow-band filter, all of which are connected by optical fiber.
3. The testing apparatus of claim 2, wherein the picosecond short pulse light source is used for generating a broadband correlation photon pair when the pump light source enters the periodically polarized waveguide, and the periodically polarized waveguide is integrated with a temperature control unit for moving the spectrum of the correlation photon to a short wave or a long wave within a certain spectral range by adjusting the working temperature of the waveguide.
4. The test apparatus of claim 3, wherein the adjustable attenuator is configured to adjust the intensity of the incident optical signal.
5. The test apparatus of claim 4, wherein the periodically poled waveguide, as a nonlinear medium, is configured to generate communication band-associated photon pairs.
6. The test apparatus of claim 5, wherein the 1550/1310 wavelength division multiplexing is used to separate 1550nm band and 1310nm band associated photons and to perform preliminary filtering of the pump light source.
7. The testing apparatus of claim 6, wherein the 1550nm broadband filter, the 1310nm broadband filter, are configured to enable further suppression of pump light sources and non-associated photons.
8. The test apparatus of claim 7, wherein the 1550nm band tunable narrowband filter, the 1310nm band tunable narrowband filter are for narrowband filtering of correlated photons, the filtering center wavelength and bandwidth being tunable; the trigger signal unit is used for triggering the picosecond short pulse light source, the single photon detector to be detected and the single photon detector, and adjusting time delay among three paths of trigger signals to enable the three paths of trigger signals to work synchronously; the coincidence measurement unit is used for performing coincidence measurement on the counting signals of the two paths of single photon detectors; the control, measurement and display unit is used for setting the test parameters of the test device and analyzing and displaying the measurement results.
9. A detection efficiency testing method for a single photon detector in a communication waveband is characterized by comprising the following steps:
step 1: the correlated photon source generates two paths of communication waveband photon signals, one path of the narrow-band optical signal is incident to a trigger detector, the trigger detector is a trigger single photon detector, and one path of the wide-band optical signal is incident to a single photon detector to be detected;
step 2: setting a trigger detector and a detector to be detected to work in a Geiger mode, adjusting the detection time delay of the trigger detector and the detector to be detected by a trigger signal to realize synchronous detection of photons, and accessing output counting signals of the trigger detector and the detector to be detected to a coincidence measurement unit;
and step 3: the coincidence measurement unit records coincidence count values of the two paths of counting signals at different time difference values to obtain a coincidence main peak value, simultaneously records an output count value of the trigger single-photon detector, and divides the coincidence main peak value by the count value of the trigger single-photon detector and the channel transmittance of the single-photon detector to be detected to obtain the detection efficiency of the single-photon detector to be detected.
10. The measurement method according to claim 9, wherein in the step 2, the step of synchronously detecting the photons by the trigger signal comprises the following specific steps: setting the working gate width and detection efficiency or bias voltage of the two detectors, adjusting the time delay among the signals by the trigger signal unit, synchronizing the associated photon source, the detector to be detected and the trigger detector to maximize the count value of the two detectors, respectively accessing the count signals of the two detectors into the start and stop channels conforming to the measurement unit, and analyzing the coincidence measurement histogram of the two paths of count signals to obtain a coincidence count value McSimultaneously recording the count value M of the trigger detectortriggerAnd the calculation formula of the detection efficiency eta of the single photon detector to be detected is formula (1):
and t is the integral transmittance of the associated photons from the waveguide to the single photon detector to be tested.
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| CN1467488A (en) * | 2002-07-08 | 2004-01-14 | 中国科学院物理研究所 | Absolute self-demarcating method for single photon detector quantum efficiency and private equipment thereof |
| CN103076085A (en) * | 2012-12-31 | 2013-05-01 | 中国电子科技集团公司第四十一研究所 | Method for simultaneously measuring broadband visible light and near-infrared radiation |
| CN103151692A (en) * | 2013-02-05 | 2013-06-12 | 南京信息工程大学 | Multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and control method thereof |
| CN206331216U (en) * | 2016-12-21 | 2017-07-14 | 济南量子技术研究院 | A kind of entangled photon pairs are produced and separator |
| CN111510225A (en) * | 2020-03-20 | 2020-08-07 | 军事科学院系统工程研究院网络信息研究所 | Quantum communication networking method and system based on multi-wavelength entangled light source |
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