A Quantum Key Distribution System Based on Frame-Independent Protocol

A technology of quantum key distribution and reference frame, applied in the field of quantum key distribution system based on reference frame independent protocol, can solve the problems that cannot be directly used to realize reference frame independent protocol, etc. The effect of improving the code rate

Active Publication Date: 2019-08-27
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, the optical injection laser prepares two optical pulses or three pulses in one cycle, and the phase difference between two pulses is 4 values One of them corresponds to the four quantum states of the two groups of basis vectors, where 0 and π correspond to the X basis vectors, Corresponding to the Y base vector, the experimental research in this document can be used to realize the BB84 protocol or the DPS protocol, but it cannot be directly used to realize the reference frame independent protocol

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  • A Quantum Key Distribution System Based on Frame-Independent Protocol
  • A Quantum Key Distribution System Based on Frame-Independent Protocol
  • A Quantum Key Distribution System Based on Frame-Independent Protocol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as figure 1 A QKD system based on a reference frame-independent protocol is shown, including a quantum key encoding end Alice, a quantum key decoding end Bob, and a quantum key distribution channel connecting Alice and Bob. Alice is equipped with a first laser driver Drive1, a pulse generation laser LD1, a second laser driver Drive2, a phase preparation laser LD2, a first three-port circulator CIR1, and an adjustable optical attenuator VOA; Bob has a built-in first beam splitter BS1 , an unbalanced interferometer, a first single-photon detector D1, a second single-photon detector D2, and a third single-photon detector D3. The unbalanced interferometer is a Michelson interferometer interferometer with automatic polarization compensation function. The unbalanced interferometer is equipped with a second three-port circulator CIR2, a first beam splitter BS2, a first Faraday rotating mirror FM1, and a second Faraday Rotating mirror FM2, phase modulator PM.

[0057] Th...

Embodiment 2

[0102] Example 2: Two single photon detectors for phase decoding measurements are replaced by one single photon detector

[0103] A QKD system based on a reference frame-independent protocol, the quantum key decoding end Bob is as follows: image 3 As shown, the difference between this embodiment and Embodiment 1 is that the detection module for the phase decoding measurement at the Bob end is improved, and a third beam splitter BS3 and an optical fiber delay line DL are additionally provided, and the second single photon Detector D2. Port b of the second beam splitter BS2 is connected to an input port of the third beam splitter, and port 3 of the second three-port circulator CIR2 is connected to another input port of the third beam splitter through an optical fiber delay line DL, The output port of the third beam splitter is connected with the second single photon detector D1.

[0104] When the double-pulse signal light interferes in the second beam splitter BS2, it is dete...

Embodiment 3

[0106] Embodiment 3: Replace all single photon detectors with the same single photon detector

[0107] A QKD system based on a reference frame-independent protocol, the quantum key decoding end Bob is as follows: Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the detection module at the Bob end is improved, and the third beam splitter BS3, the fourth beam splitter BS4, the first optical fiber delay line DL1 and the second beam splitter are additionally provided. The two-fiber delay line DL2 cancels the second single-photon detector D2 and the third single-photon detector D3. An output port of the first beam splitter BS1 is connected with an input port of the fourth beam splitter through the second fiber delay line DL2, and the second beam splitter BS2 port b is connected with an input port of the third beam splitter, Port 3 of the second three-port circulator is connected with another input port of the third beam splitter through the first...

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Abstract

The invention discloses a quantum key distribution system based on a reference frame-independent protocol, which uses light injection semiconductor lasers to generate quantum states with encoded information, replacing the traditional scheme of light sources and quantum state encoding modules. The photon time and phase difference information is generated by the light injection semiconductor laser in the quantum key encoding end, the first laser driver, the second laser driver, the pulse generation laser, the phase preparation laser, the first three ports in the quantum key encoding end The circulator forms the light injection semiconductor laser, and the second laser driver controls the phase preparation laser to inject the phase-modulated optical pulse with the pre-adjusted Δφ phase into the pulse generation laser, so that the pulse generation laser controlled by the first laser driver can generate a pair of phase difference Δφ Double-pulse signal light, thereby generating a pulse sequence with time and phase encoding information. The technical solution improves the anti-interference and coding rate of the system, and is beneficial to product integration and miniaturization.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a quantum key distribution system based on a reference frame independent protocol. Background technique [0002] Secure communication is a communication system that encrypts the code stream of the transmitted information source at the sending end and decrypts and authenticates at the receiving end to prevent information from being disturbed or eavesdropped. It can ensure the security and integrity of the information transmitted by both parties in communication. At present, the RSA public key system is generally used in secure communication. The security of this public key system is guaranteed by the complexity of the algorithm and the limitation of computer computing power. It threatens the security of the existing RSA public key system. As a reliable key distribution system, quantum key distribution (QKD) is guaranteed by quantum characteristics such as the Heisenberg uncer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
Inventor 富尧李浩泉
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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