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High-encoding-rate point-to-point QKD system, transmitting terminal, receiving terminal and QKD method

A code rate, point-to-point technology, used in transmission systems, digital transmission systems, wavelength division multiplexing systems, etc., can solve the problem of limited code rate improvement and limited code rate. Working frequency, working efficiency limitation and other issues, to achieve the effect of improving code rate, reducing cost and energy consumption, and reducing insertion loss

Pending Publication Date: 2016-11-23
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The operating frequency and efficiency of lasers, single photon detectors and other devices in a single QKD system are limited, so the improvement of the coding rate is limited
[0008] The existing one-to-many, many-to-many QKD multiplexing network uses a plug-and-play system solution based on phase coding, and its coding rate is limited by the modulation accuracy of the phase modulators at the sending and receiving ends.

Method used

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  • High-encoding-rate point-to-point QKD system, transmitting terminal, receiving terminal and QKD method
  • High-encoding-rate point-to-point QKD system, transmitting terminal, receiving terminal and QKD method
  • High-encoding-rate point-to-point QKD system, transmitting terminal, receiving terminal and QKD method

Examples

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Embodiment 1

[0045] Embodiment 1 One-way communication

[0046] Such as figure 1 As shown, a high coding rate point-to-point QKD system of the present invention includes a matching transmitting end (Alice) and a receiving end (Bob), and the transmitting end and receiving end communicate through a multi-core optical fiber 104 .

[0047] The transmitting end includes a light source module (specifically using a laser board), multiple beam splitters (such as beam splitter 101), an encoder (signal light encoding module), multiple wavelength division multiplexers (such as wavelength division multiplexer 102), an optical fiber fan output device 103 as a multi-core optical fiber interface.

[0048] In addition, a main control logic module is provided, namely figure 1 Alice's electronic equipment is used to control the laser board and synchronous light source to emit light and generate modulation signals for the signal light encoding module, etc.

[0049] The logic control unit in Alice's electr...

Embodiment 2

[0078] Embodiment 2 two-way communication

[0079] Figure 4 It is a high coding rate point-to-point QKD system capable of two-way communication. It is an improved solution of Embodiment 1, using a fiber optic circulator (such as fiber optic circulator 401 and fiber optic circulator 407) to add devices symmetrical to the original multiplexing system at Alice’s transmitting end and Bob’s receiving end in Embodiment 1: signal light The decoding module 2, the signal light detection module 2, the laser plate 2, and the signal light encoding module 2 enable the quantum communication in the positive and negative directions to share the wavelength division multiplexer (such as the wavelength division multiplexer 402 and the wavelength division multiplexer 402). 406), optical fiber fan-shaped output device (fiber-optic fan-shaped output device 403 and fiber-optic fan-shaped output device 405) and an intensive optical path composed of multi-core optical fiber 404, and simultaneously a...

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Abstract

The invention discloses a high-encoding-rate point-to-point QKD system, a transmitting terminal, a receiving terminal and a QKD method. The transmitting terminal comprises a light source module, an encoder, wavelength division multiplexers and a fiber interface in sequence in the optical signal transmission direction, and further comprises a main control logic module used for sending a control signal to the encoder. The light source module comprises a plurality of light sources with different emission wavelengths. The output end of each light source is connected with a beam splitter. The outputs of the corresponding light sources are divided into multiple optical signals to be outputted to the encoder for encoding through the beam slitters. The fiber interface is a multi-core fiber interface, and is used for converting the optical signals from the wavelength division multiplexers into multi-core fibers to be transmitted to the receiving terminal. When QKD system is provided with n light sources with different wavelengths and m multi-core fibers, n*m quantum key distribution lines can be accommodated, and the encoding rate is n*m times of that of an original single QKD system.

Description

technical field [0001] The invention relates to a point-to-point QKD technology, in particular to a point-to-point QKD system with high coding rate, a transmitting end, a receiving end and a QKD method. Background technique [0002] Quantum communication is a new technology that combines quantum mechanics and cryptanalysis. Its security is guaranteed by the basic principles of quantum mechanics - Heisenberg's uncertainty principle and quantum non-cloning theorem, which can ensure the security of key distribution and transmission. Therefore, it has been highly valued by governments and military departments of various countries, and many research institutions have carried out a lot of research on quantum communication. Quantum communication research includes quantum key distribution (QKD), quantum storage and relay, quantum digital signature, quantum coding, quantum secret sharing, quantum secure computing protocol, etc., among which QKD is the core research content, and it is...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04J14/02
CPCH04J14/028H04L9/0858Y02D30/70
Inventor 富尧王真真李浩泉
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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