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Single-photon polarization control method based on phase encoding quantum key distribution (QKD) system and single-photon polarization control device based on phase encoding quantum key distribution (QKD) system

A polarization control and phase encoding technology, which can be used in transmission systems, digital transmission systems, security communication devices, etc., and can solve problems such as reduced locking efficiency

Active Publication Date: 2016-02-17
SHANXI UNIV
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Problems solved by technology

In order to achieve efficient and accurate polarization real-time feedback, not only the appropriate polarization control device (n>=4) must be used, but also an appropriate algorithm must be used to offset the decrease in locking efficiency due to the increase of n

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  • Single-photon polarization control method based on phase encoding quantum key distribution (QKD) system and single-photon polarization control device based on phase encoding quantum key distribution (QKD) system
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  • Single-photon polarization control method based on phase encoding quantum key distribution (QKD) system and single-photon polarization control device based on phase encoding quantum key distribution (QKD) system

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[0050] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] Such as figure 1 As shown, the single-photon polarization control device based on the phase-encoded QKD system includes a sending end and a receiving end.

[0052] The sending end (Alice) of the QKD system generates synchronous light and signal light, which are sent to the receiving end (Bob) through the quantum channel and the classical channel respectively. After the synchronous light reaches the receiving end, it enters the clock management module. The clock management module generates two clocks, which are respectively input to the clock input port of the signal acquisition module for collecting signal light and reference light counting, and the reference light single photon detector (SPD_R) trigger port for detecting the reference light signal. After the signal light reaches the receiving end, it is connected to the optical inp...

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Abstract

The invention relates to a single-photon polarization self-calibrating and locking method and device based on a phase encoding quantum key distribution (QKD) system and a single-photon polarization control based on phase encoding quantum key distribution system. The polarization control scheme is divided into a calibration process and a locking process which are automatically switched through judging the threshold of a feedback signal. According to the scheme, efficient automatic polarization calibration and locking are realized through the matching of a polarization beam splitter, a multi-degree-of-freedom polarization controller and a genetic algorithm; a polarization feedback circuit device comprises the polarization beam splitter, a polarization controller, a single-photon detector, a signal acquiring and processing module and corresponding control circuits. By using the polarization control method, polarization can be continuously and precisely controlled without reset operation in real time under the condition that the strength of the feedback signal is in the single-photon magnitude, and human intervention is not needed in the whole control process.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a polarization control method and device for automatic polarization calibration and long-term real-time locking applied in a phase-encoded quantum key distribution system (QKD). Specifically, the electronically controlled polarization controller (EPC) combined with the polarization beam splitter (PBS) combined with the genetic algorithm (GA) is used to realize the automatic calibration of the system state of polarization (SOP) in the phase-encoded quantum key distribution system. A method and device for realizing a fully automatic and stable quantum key distribution system by performing real-time, accurate and high-speed polarization locking during the key distribution process. Background technique [0002] Quantum key distribution can enable both parties in communication to obtain safe and reliable keys, and the phase-encoded quantum key distribution system is one of ...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 景明勇于波胡建勇张国峰肖连团贾锁堂
Owner SHANXI UNIV
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