CN113776665B - Device and method for testing detection efficiency of single photon detector in communication band - Google Patents
Device and method for testing detection efficiency of single photon detector in communication band Download PDFInfo
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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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 wave band, wherein the specific test principle is as follows: the spontaneous parametric radiation process in the nonlinear optical medium can generate a correlated photon pair with a certain probability, namely, one high-frequency photon annihilates and simultaneously generates two low-frequency photons, and the existence of the other photon can be predicted by detecting one photon by utilizing the correlation of the correlated 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 using coincidence measurement, wherein the obtained coincidence measurement value is a counting signal of two paths of photons detected at the same time, and the detection efficiency of the single photon detector to be detected can be obtained by the coincidence measurement value, the trigger detection count value and the light path transmittance of the photons detected by the detector to be detected. The invention is a reference type measurement scheme, does not need to trace to a higher level of measurement 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 band.
Background
Currently, single photon detectors are mainly applied in the fields of quantum secret communication, quantum precision measurement, micro-light detection and the like, and are typically used in quantum secret communication terminals. The performance characterization parameters of the single photon detector mainly comprise dark count, detection efficiency, linearity, post pulse probability and the like, and the parameters have direct influence on 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 single photon detector is excited by a quasi-single photon source generated by laser attenuation, the quasi-single photon source intensity is calculated indirectly after the output intensity of the laser source and the attenuation multiple of the attenuator are calibrated respectively by a standard power meter, and the detection efficiency and the measurement accuracy of linearity are mainly determined by the measurement accuracy and linearity of the standard power meter, so the method is a test method which needs to trace the source to a higher level standard. If measurements are to be made at multiple communication wavelengths, it is necessary to match multiple light sources and corresponding standard power meters. 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 measured further accurately, the post-pulse count needs to be measured separately by using a time-dependent single photon count technique or the like.
With the development of quantum information technology, the requirements of mass production and wide application of single photon detectors on high accuracy, portability and automation test of single photon detectors are more and more obvious, and especially, the measurement of core parameter detection efficiency is based on a traditional laser attenuation measurement scheme, and the measurement accuracy cannot be further improved due to progressive accumulation of error in the mass transfer process.
At present, the main stream test scheme of the detection efficiency of the single photon detector is to attenuate a laser source to a single photon magnitude, and the number of emergent photons is indirectly calculated by calibrating the output power of the 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: whether the light source, the optical attenuator or the optical power meter has more mature products, a set of testing system can be built after the products of different manufacturers are matched, but the defects are obvious: (1) the test system consists of different discrete instruments, is not easy to carry, needs to specially develop and design aiming at each instrument, and is difficult to realize automatic test; (2) the single photon source is generated by carrying out large dynamic range attenuation on the laser source, the intensity, the stability and the optical filters of the laser source are measured by a standard power meter, and as the optical power of the single photon level is extremely weak, a plurality of optical filters are required to be independently measured and then are used in series, more measuring links lead to continuous accumulation of measuring errors, so the measuring precision is limited and is difficult to further improve; (3) the single photon detector is different from the traditional photoelectric detector, the working physical process is complex, the parameters are related to each other, for example, the detection efficiency measured by a laser attenuation method comprises the probability of the rear pulse, if the probability of the rear pulse is required to be tested, the counting signal of the single photon detector to be tested is recorded and analyzed by using a coincidence measuring instrument, so that a complete testing system needs to be composed of a plurality of different types of instruments. This approach has generally failed to meet the increasing test demands in terms of portability, automated testing, improved test accuracy, and the like.
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 wave band, which are based on a set of test system formed by a correlated photon source and a coincidence measuring instrument.
The specific test principle is as follows: the spontaneous parametric radiation process in the nonlinear optical medium can generate a correlated photon pair with a certain probability, namely, one high-frequency photon annihilates and simultaneously generates two low-frequency photons, and the existence of the other photon can be predicted by detecting one photon by utilizing the correlation of the correlated 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 using coincidence measurement, wherein the obtained coincidence measurement value is a counting signal of two paths of photons detected at the same time, and the detection efficiency of the single photon detector to be detected can be obtained by the coincidence measurement value, the trigger detection count 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: the device for testing the detection efficiency of the single photon detector in the communication wave band comprises an associated photon source, a trigger signal unit, a coincidence measurement unit and a corresponding control, measurement and display unit; the test is as follows: the method comprises the steps that an associated photon source generates two paths of photon signals, one path of narrowband optical signals enters a trigger detector, the trigger detector is a trigger single photon detector, one path of broadband optical signals enters a detector to be detected, if the trigger detector and the detector to be detected are both operated in a Geiger mode, synchronous detection of photons is achieved through adjustment of detection time delay of the trigger detector and the detector to be detected by the trigger signal, output counting signals of the trigger detector and the detector to be detected are connected into a coincidence measuring unit, the coincidence measuring unit records coincidence counting values of the two paths of counting signals at different time differences to obtain a coincidence main peak value, meanwhile records an output counting value of the trigger single photon detector, and the detection efficiency of the single photon detector to be detected is obtained by dividing the coincidence main peak value by the counting value of the trigger single photon detector and the channel transmittance of the single photon detector to be detected.
In the foregoing, the associated photon source is configured to generate an associated photon pair for exciting a detector to be detected and triggering the detector, and includes: the picosecond short pulse light source, the adjustable attenuator, the periodic polarization waveguide, the 1550/1310 wavelength division multiplexing, the 1550nm broadband filter, the 1310nm broadband filter, the 1 multiplied by 2 optical switch, the 1550nm band tunable narrow-band filter, the 1310nm band tunable narrow-band filter and the optical fiber connection between the above parts.
In the foregoing, the picosecond short pulse light source is used for the pump light source to enter the periodically polarized waveguide to generate the broadband associated photon pair, the periodically polarized waveguide is integrated with the temperature control unit, and the spectrum of the associated photon is moved to the short wave or the long wave within a certain spectrum range by adjusting the working temperature of the waveguide.
In the above, the adjustable attenuator is used for adjusting the light intensity of the incident light signal.
In the foregoing, the periodically poled waveguide is used as a nonlinear medium for generating communication band-associated photon pairs.
In the above, the 1550/1310 wavelength division multiplexing is used for separating the 1550nm band and 1310nm band associated photons and performing preliminary filtering on the pump light source.
In the above, the 1550nm broadband filter and the 1310nm broadband filter are used for further suppressing the pump light source and the non-correlated photons.
In the above, the 1550nm band tunable narrow-band filter and the 1310nm band tunable narrow-band filter are used for narrow-band filtering of the 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 the time delay between three paths of trigger signals to enable the trigger signals to work synchronously; the coincidence measurement unit is used for carrying out 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 detection efficiency testing method of the single photon detector in the communication band, which comprises the following steps:
step 1: the related photon source generates two paths of communication band photon signals, one path of narrowband optical signals is incident to the trigger detector, the trigger detector is a trigger single photon detector, and one path of broadband optical signals is incident to the 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 through a trigger signal to realize synchronous detection of photons, and accessing output counting signals of the trigger detector and the detector to be detected into a coincidence measurement unit;
step 3: the coincidence measurement unit records coincidence count values of two paths of counting signals at different time differences to obtain a coincidence main peak value, simultaneously records an output count value of the trigger single photon detector, and obtains the detection efficiency of the single photon detector to be detected by dividing 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.
In the above method, in the step 2, the specific steps for implementing synchronous detection of photons by using a trigger signal are as follows: setting the working gate width and detection efficiency or bias voltage of the two detectors, adjusting the time delay between 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 starting and stopping channels of the coincidence measurement unit, and obtaining the coincidence count value M by analyzing the coincidence measurement histogram of the two paths of count signals c Simultaneously recording trigger detector count value M trigger The detection efficiency eta of the single photon detector to be detected is calculated as formula (1):
where τ is the overall transmittance of the correlated photons from the waveguide to the access to the single photon detector under test.
Specifically, when the detection efficiency is measured in different wavebands, 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 detects efficiency measurement in 1550nm wave band, the 1X 2 optical switch (1) and the 1X 2 optical switch (2) in the related photon source are switched, so that an optical signal is output through the 1550nm wave band broadband filter and is incident to the single photon detector to be detected, and meanwhile, the 1X 2 optical switch (3) and the 1X 2 optical switch (4) are switched, so that the optical signal is output through the 1310nm wave band tunable narrowband filter and is incident 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 generally set to be-1 nm, the bandwidth of the 1550nm band wide-band filter is set to be-10 nm, and the bandwidth ratio of about 10:1 basically comprises 1550nm band photons associated with 1310nm band narrow-band filtered photons. Similarly, when the single photon detector to be detected detects efficiency measurement in 1310nm wave band, the 1×2 optical switch (1) and the 1×2 optical switch (2) in the related photon source are switched, so that an optical signal is output through the 1550nm wave band tunable narrow-band filter and is incident to trigger the single photon detector, meanwhile, the 1×2 optical switch (3) and the 1×2 optical switch (4) are switched, so that the optical signal is output through the 1310nm wave band broadband filter and is incident to the single photon detector to be detected, the bandwidth of the 1310nm wave band broadband filter is set to 10nm, and the bandwidth of the 1550nm wave band tunable narrow-band filter is set to 1nm.
The technical scheme of the invention is as follows: 1. the invention provides a method for testing the detection efficiency of a single photon detector based on an associated photon source, which can measure the detection efficiency of the single photon detector at two wavelengths in a communication band. The measurement scheme provided by the invention is used for measuring the detection efficiency of the single photon detector, the measurement accuracy is determined by the parameters of the device, and the measurement scheme is different from the existing laser attenuation test scheme which needs to trace the higher-level measurement standard outside and does not need to carry out post-pulse probability correction. 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 simultaneously generates two communication band photon signals, and detection efficiency measurement at two wavelengths can be simultaneously realized by switching broadband/narrowband filtering. 4. Compared with the existing laser attenuation test scheme, the method has higher test precision for measuring the detection efficiency, and the measurement of the detection efficiency corrects the probability of the rear pulse.
Drawings
FIG. 1 is a schematic diagram of measurement of detection efficiency of a single photon detector in a communication band according to the present invention.
FIG. 2 is a schematic diagram of the composition of the correlated photon source in the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. 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. The term "and/or" as used in this specification 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 wave band, which can measure the detection efficiency of the single photon detector at two wavelengths in the communication wave band at the same time. The measurement scheme provided by the invention is used for measuring the detection efficiency of the single photon detector, and the measurement accuracy is determined by the parameters of the device, which is different from the existing test scheme which needs to trace the higher-level measurement standard to the outside.
Example 1
In order to achieve the above objective, as shown in fig. 1, the dashed line in fig. 1 represents an optical signal, and the solid line represents an electrical signal, and the technical scheme adopted by the present invention is as follows: provided is a detection efficiency testing device of a single photon detector in a communication band, comprising: the associated photon source, the trigger signal unit, the coincidence measurement unit and the corresponding control, measurement and display unit; the test is as follows: the method comprises the steps that an associated photon source generates two paths of photon signals, one path of narrowband optical signals enters a trigger detector, the trigger detector is a trigger single photon detector, one path of broadband optical signals enters a detector to be detected, if the trigger detector and the detector to be detected are both operated in a Geiger mode, synchronous detection of photons is achieved through adjustment of detection time delay of the trigger detector and the detector to be detected by the trigger signal, output counting signals of the trigger detector and the detector to be detected are connected into a coincidence measuring unit, the coincidence measuring unit records coincidence counting values of the two paths of counting signals at different time differences to obtain a coincidence main peak value, meanwhile records an output counting value of the trigger single photon detector, and the detection efficiency of the single photon detector to be detected is obtained by dividing the coincidence main peak value by the counting value of the trigger single photon detector and the channel transmittance of the single photon detector to be detected.
The associated photon source is used for generating associated photon pairs for exciting the detector to be detected and the trigger detector, and the associated photon sources are composed as shown in the following figure 2 and comprise: the picosecond short pulse light source, the adjustable attenuator, the periodic polarization waveguide, the 1550/1310 wavelength division multiplexing, the 1550nm broadband filter, the 1310nm broadband filter, the 1X 2 optical switch, the 1550nm band tunable narrow-band filter, the 1310nm band tunable narrow-band filter and the parts are connected through optical fibers.
The picosecond short pulse light source is used as a pumping light source to be incident into a 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 be moved to a short wave or a long wave within a certain spectrum range by adjusting the working temperature of the waveguide.
The adjustable attenuator is used for adjusting the light intensity of an incident light signal.
The periodically poled waveguide acts as a nonlinear medium for producing communication band-dependent photon pairs.
The 1550/1310 wavelength division multiplexing is used for separating 1550nm wave band and 1310nm wave band associated photons and performing primary filtering on the pumping light source.
The 1550nm broadband filter and the 1310nm broadband filter are used for further suppressing the pumping light source and the uncorrelated photons.
The 1×2 optical switch is used for switching optical paths.
The 1550 nm-band tunable narrowband filter and the 1310 nm-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 the time delay between the three trigger signals to enable the trigger signals to work synchronously.
The coincidence measurement unit is used for carrying out 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.
Example two
On the basis of the embodiment, the associated photon source generates two paths of photon signals, one path of narrow-band light signals enters the trigger detector, the trigger detector is a trigger single-photon detector, one path of broadband light signals enters the detector to be detected, if the trigger detector and the detector to be detected are both operated in a geiger mode, synchronous detection of photons is achieved through adjustment of detection time delay of the trigger detector and the detector to be detected by the trigger signals, output counting signals of the trigger detector and the detector to be detected are connected into the coincidence measuring unit, the coincidence measuring unit records coincidence counting values of the two paths of counting signals at different time differences to obtain a coincidence main peak value, meanwhile records output counting values of the trigger single-photon detector, and detection efficiency of the single-photon detector to be detected is obtained by dividing the coincidence counting main peak value by the counting value of the trigger single-photon detector and the channel transmittance of the single-photon detector to be detected.
In the above, the specific steps for implementing the synchronous detection of photons by the trigger signal are as follows: setting the working gate width and detection efficiency (or bias voltage) of the two detectors, adjusting the delay between 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, and counting the signals of the two detectorsThe numbers are respectively connected into a starting channel and a stopping channel of the coincidence measurement unit, and coincidence count value M is obtained by analyzing coincidence measurement histograms of two paths of counting signals c Simultaneously recording trigger detector count value M trigger The detection efficiency eta of the single photon detector to be detected is calculated as formula (1):
where τ is the overall transmittance of the correlated photons from the waveguide to the access to the single photon detector under test.
Specifically, when the single photon detector to be detected detects efficiency measurement in 1550nm wave band, the 1×2 optical switch (1) and the 1×2 optical switch (2) are switched, so that an optical signal is output through the 1550nm wave band broadband filter and is incident to the single photon detector to be detected, and meanwhile, the 1×2 optical switch (3) and the 1×2 optical switch (4) are switched, so that the optical signal is output through the 1310nm wave band tunable narrow band filter and is incident to 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 generally set to be-1 nm, the bandwidth of the 1550nm band wide-band filter is set to be-10 nm, and the bandwidth ratio of about 10:1 basically comprises 1550nm band photons associated with 1310nm band narrow-band filtered photons. Similarly, when the single photon detector to be detected detects efficiency measurement in 1310nm wave band, the 1 x 2 optical switch (1) and the 1 x 2 optical switch (2) are switched to enable the optical signal to be output through the 1550nm wave band tunable narrow-band filter and to be incident to trigger the single photon detector, meanwhile, the 1 x 2 optical switch (3) and the 1 x 2 optical switch (4) are switched to enable the optical signal to be output through the 1310nm wave band broadband filter and to be incident to the single photon detector to be detected, the 1310nm wave band broadband filter bandwidth is set to be 10nm, and the 1550nm wave band tunable narrow-band filter bandwidth is set to be 1nm.
The technical scheme of the invention is as follows: 1. the invention provides a method for testing the detection efficiency of a single photon detector based on an associated photon source, which can measure the detection efficiency of the single photon detector at two wavelengths in a communication band. The measurement scheme provided by the invention is used for measuring the detection efficiency of the single photon detector, the measurement accuracy is determined by the parameters of the device, and the measurement scheme is different from the existing laser attenuation test scheme which needs to trace the higher-level measurement standard outside and does not need to carry out post-pulse probability correction. 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 simultaneously generates two communication band photon signals, and detection efficiency measurement at two wavelengths can be simultaneously realized by switching broadband/narrowband filtering. 4. Compared with the existing laser attenuation test scheme, the method has higher test precision for measuring the detection efficiency, and the measurement of the detection efficiency corrects the probability of the rear pulse.
The above-described features are continuously combined with each other to form various embodiments not listed above, and are regarded as the scope of the present invention described in the specification; and, it will be apparent to those skilled in the art from this disclosure that modifications and variations can be made without departing from the scope of the invention defined in the appended claims.
Claims (6)
1. The device for testing the detection efficiency of the single photon detector in the communication wave band is characterized by comprising an associated photon source, a trigger signal unit, a coincidence measurement unit and a corresponding control, measurement and display unit; the test is as follows: the method comprises the steps that an associated photon source generates two paths of photon signals, one path of narrow-band light signals enters a trigger detector, the trigger detector is a trigger single-photon detector, one path of broadband light signals enters a detector to be detected, if the trigger detector and the detector to be detected are both operated in a Geiger mode, synchronous detection of photons is achieved through adjustment of detection time delay of the trigger detector and the detector to be detected by the trigger signal, output count signals of the trigger detector and the detector to be detected are connected to a coincidence measurement unit, the coincidence measurement unit records coincidence count values of the two paths of count signals at different time differences to obtain a coincidence main peak value, meanwhile records an output count value of the trigger single-photon detector, and the coincidence main peak value is divided by the count value of the trigger single-photon detector and the channel transmittance of the single-photon detector to be detected to obtain detection efficiency 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 a trigger detector, and comprises: the picosecond short pulse light source, the adjustable attenuator, the periodic polarization waveguide, 1550/1310 wavelength division multiplexing, 1550nm broadband filter, 1310nm broadband filter, 1X 2 optical switch, 1550nm band tunable narrow-band filter, 1310nm band tunable narrow-band filter are connected through optical fibers; the picosecond short pulse light source is used for making the pumping light source incident on 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 is moved to a short wave or a long wave within a certain spectrum range by adjusting the working temperature of the waveguide; the 1550/1310 wavelength division multiplexing is used for separating 1550nm wave band and 1310nm wave band associated photons and performing primary filtering on the pumping light source.
2. The test apparatus of claim 1, wherein the adjustable attenuator is configured to adjust the intensity of the incident light signal.
3. The test apparatus of claim 2, wherein the periodically poled waveguides are used as nonlinear media for producing communication band-associated photon pairs.
4. The test apparatus of claim 3, wherein the 1550nm broadband filter, 1310nm broadband filter are for effecting further suppression of pump light sources and non-associated photons.
5. The test apparatus of claim 4, wherein the 1550 nm-band tunable narrowband filter, 1310 nm-band tunable narrowband filter is for narrowband filtering of associated 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 the time delay between three paths of trigger signals to enable the trigger signals to work synchronously; the coincidence measurement unit is used for carrying out 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.
6. The method for testing the detection efficiency of the single photon detector in the communication band is characterized by comprising the following steps of:
step 1: the related photon source generates two paths of communication band photon signals, one path of narrowband optical signals is incident to the trigger detector, the trigger detector is a trigger single photon detector, and one path of broadband optical signals is incident to the 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 through a trigger signal to realize synchronous detection of photons, and accessing output counting signals of the trigger detector and the detector to be detected into a coincidence measurement unit; in the step 2, the specific steps for implementing the synchronous detection of photons by the trigger signal are as follows: setting the working gate width and the detection efficiency or bias voltage of the two detectors, then adjusting the time delay among the signals through a 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 a starting channel and a stopping channel of a coincidence measurement unit, analyzing the coincidence measurement histogram of the two paths of count signals to obtain a coincidence count value Mc, simultaneously recording the count value Mtrigger of the trigger detector, and calculating the detection efficiency eta of the single photon detector to be detected according to the formula (1):
wherein,generating the overall transmittance from the waveguide to the access of the single photon detector to be detected for the correlated photons;
step 3: the coincidence measurement unit records coincidence count values of two paths of counting signals at different time differences to obtain a coincidence main peak value, simultaneously records an output count value of the trigger single photon detector, and obtains the detection efficiency of the single photon detector to be detected by dividing 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.
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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