Method and apparatus for detecting quantum communication systems
A technology for quantum communication and single-photon detectors, applied in the field of quantum communication, can solve problems such as affecting the coding rate of the system, and achieve the effect of preventing the increase of the error rate
Active Publication Date: 2021-08-13
QUDOOR TECH INC
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Since the interference effect of the unequal arm interferometer will significantly affect the error rate in the quantum key distribution system, the interference effect of the unequal arm interferometer used in the quantum key distribution system will directly affect the quantum key distribution system. Error rate, which in turn affects the coding rate of the system
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[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0028] figure 1 A flowchart of a method for detecting a quantum communication system according to an exemplary embodiment of the present invention is shown.
[0029] refer to figure 1 , figure 1 The illustrated method may include the following steps.
[0030] In step 101, the first background count detected in the first single photon detector connected to the output end of the scalene interferometer can be obtained without inputting an optical pulse to the scalene interferometer and the The second background count detected in the second single photon detector connected to the output end of the equi-arm interferometer.
[0031] Here, the background counting refers to the single photon counting at each delay position (or time position) detected from the single photon detector under the condition that no light pulse is input, wherein the first ba...
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The present invention provides a method and apparatus for testing a quantum communication system, the method comprising: acquiring background counts detected in a first single photon detector and a second single photon detector in the absence of an input optical pulse; In the case of inputting an optical pulse to the unequal interferometer via the reference unequal interferometer, the phase modulation voltage detected in the first single-photon detector and the second single-photon detector is obtained at a predetermined time-delay position along with the phase modulation. The most value in the phase count that changes and changes; From the background count, the most value in the phase count, derive the forward contrast and / or reverse contrast between the two arms of the unequal arm interferometer respectively; Encoding and / or decoding is performed using a unequal arm interferometer in response to the contrast and / or inverse contrast reaching a system design threshold. The method and device provided by the invention can prevent the problem that the error rate of the quantum communication system increases due to the deterioration of the interference effect of the unequal arm interferometer.
Description
technical field [0001] The present invention relates to the technical field of quantum communication, in particular to a method and device for detecting a quantum communication system (such as a quantum key distribution system). Background technique [0002] At present, three encoding methods, polarization encoding, phase encoding and time phase encoding, are mainly used in the quantum key distribution system. Among them, phase encoding and time phase encoding both need to use unequal arm interferometers for encoding and decoding. Since the interference effect of the unequal arm interferometer will significantly affect the error rate in the quantum key distribution system, the interference effect of the unequal arm interferometer used in the quantum key distribution system will directly affect the quantum key distribution system. Error rate, which in turn affects the coding rate of the system. Contents of the invention [0003] The object of the present invention is to pr...
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IPC IPC(8): H04B10/079H04B10/70H04B10/548H04L9/08G01J1/44G01J9/02
CPCG01J1/44G01J9/02G01J2001/442H04B10/0795H04B10/548H04B10/70H04L9/0852
Inventor 陈柳平王其兵范永胜万相奎王林松
Owner QUDOOR TECH INC