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A quantum key distribution coding device

A technology of quantum key distribution and encoding device, applied in the field of quantum key distribution and encoding device, can solve problems such as incompatibility with other protocols or encoding methods, inability to implement protocols or encoding methods on demand, increasing system complexity and cost, etc. Improve the stability and practicability, improve the security code rate, and stabilize the coding effect

Active Publication Date: 2022-07-01
北京中科国光量子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for a specific protocol or a specific protocol encoding method, it is necessary to design a corresponding optical path to realize the protocol or encoding method, and most of them are not compatible with other protocols or encoding methods
Therefore, the encoding device lacks versatility, and cannot realize the switching of protocols or encoding methods according to the needs of practical applications, so as to meet the optimization of system performance.
According to the existing technology, in order to realize the switching of protocols or coding methods, it is necessary to cascade special coding devices for multiple protocols or coding methods, which greatly increases the complexity and cost of the system

Method used

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Experimental program
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Effect test

Embodiment 1

[0055] The structure of the encoding device is as follows: the polarization beam splitter module 400 includes a circulator 420 and a first polarization beam splitter 410, and the port a of the circulator 420 is used as the port a of the polarization beam splitter module 400; the circulator The port b of 420 is connected to the port a of the first polarization beam splitter 410; the port b and port c of the first polarization beam splitter 410 are respectively used as the port b and port c of the polarization beam splitter module 400; the circulator The output polarization maintaining fiber of port c of 420 is spliced ​​at 45° as port d of polarization beam splitting module 400 . The polarization interferometer 100 includes a second polarization beam splitter 110 and a third polarization beam splitter 120, and both the second polarization beam splitter 110 and the third polarization beam splitter 120 include one input port and two output ports ; The input ports of the second po...

Embodiment 2

[0060] The structure of the encoding device is as follows: the polarization beam splitter module 400 is a fourth polarization beam splitter 430, and ports a-c of the fourth polarization beam splitter 430 are respectively used as ports a-c of the polarization beam splitter module 400; The output polarization maintaining fiber of the port d of the four-polarization beam splitter 430 is spliced ​​at 45° as the port d of the polarization beam splitting module 400 . The polarization interferometer 100 includes a fifth polarization beam splitter 130, a first Faraday mirror 140 and a second Faraday mirror 150. The fifth polarization beam splitter 130 includes two input ports and two output ports, so The two input ports of the fifth polarization beam splitter 130 are respectively used as the port A and the port B of the polarization interferometer 100, and the two output ports of the fifth polarization beam splitter 130 are respectively connected to the first port through two optical f...

Embodiment 3

[0065] The structure of the encoding device is as follows: the polarization beam splitting module 400 includes a first beam splitter 460, a first polarizer 440, a second polarizer 450 and a third polarizer 470, the first beam splitter 460 port a is used as port a of the polarization beam splitting module 400; the first beam splitter 460 ports b-d are respectively connected to the input ports of the second polarizer 450, the third polarizer 470 and the first polarizer 440, wherein The polarization maintaining fiber between the port d of the first beam splitter 460 and the first polarizer 440 is spliced ​​at 45°; the output ports of the second polarizer 450 , the third polarizer 470 and the first polarizer 440 They are respectively used as ports b-d of the polarization beam splitting module 400; the polarization directions of the first polarizer 440 and the second polarizer 450 are aligned with the horizontal polarization direction, and the polarization direction of the third pol...

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Abstract

A quantum key distribution encoding device, comprising a polarization interferometer, a first phase modulator, a second phase modulator and a polarization beam splitting module, wherein the port a of the polarization beam splitting module is an input port of the encoding device; the polarization beam splitter The port b of the beam splitting module and the port A of the polarization interferometer are respectively connected to the input port of the first phase modulator and the output port of the first phase modulator, and the port c of the polarization beam splitting module and the port B of the polarization interferometer are respectively connected. They are respectively connected with the input port of the second phase modulator and the output port of the second phase modulator to form a Sagnac ring. Compared with the prior art, the present invention can realize polarization and phase joint coding, increase the amount of information carried by a single photon bit, and further improve the security coding rate of the system. In addition, it can realize the preparation of three groups of X, Y, and Z basis vectors, support the free switching of BB84 protocol, six-state protocol and RFI protocol, and can realize the preparation of signal state and decoy state at the same time.

Description

technical field [0001] The invention relates to the technical field of quantum phase encoding, in particular to a quantum key distribution encoding device. Background technique [0002] Quantum key distribution has the security of information theory, its security is guaranteed by the basic principles of quantum mechanics, can resist the threat from quantum computers, and plays an important role in secure communication. The BB84 protocol was first proposed in the quantum key distribution (QKD) protocol. With the development of theory and experiments, various protocols have been proposed one after another, such as six-state protocol, reference frame independent protocol, etc., in various applications. Each scenario has its own advantages. The coding states that can simultaneously implement the above-mentioned various protocols are various superposition states of modes |0> and |1>, generally including three sets of basis vectors, X basis, Y basis and Z basis. The modes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/532
CPCH04L9/0858H04B10/70H04B10/532
Inventor 赵义博王东陈东升
Owner 北京中科国光量子科技有限公司
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