Method and device for detecting quantum communication system
A technology of quantum communication and single-photon detector, 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: 2021-07-13
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 invention provides a method and a device for detecting a quantum communication system. The method comprises the following steps: collecting background counts detected in a first single-photon detector and a second single-photon detector under the condition that an optical pulse is not input; collecting an extreme value in phase counts which are detected in the first single-photon detector and the second single-photon detector and change along with the change of the phase modulation voltage at a predetermined delay position under the condition that an optical pulse is input to the unequal-arm interferometer through the reference unequal-arm interferometer; deriving a forward contrast and / or a reverse contrast between the two arms of the unequal-arm interferometer from the extreme values of the background count and the phase count, respectively; using the unequal-arm interferometer for encoding and / or decoding in response to the contrast and / or reverse contrast reaching a system design threshold. According to the method and the device provided by the invention, the problem that the error rate of the quantum communication system is increased due to the fact that the interference effect of the unequal-arm interferometer becomes poor can be prevented.
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