A fully symmetric quantum key distribution system that can send and receive keys

A quantum key distribution and completely symmetrical technology, applied in key distribution, can solve the problems of not being able to share keys and limit the practicality of QKD systems, and achieve the goal of improving convenience, flexibility and practicability, and high-speed and accurate phase loading Effect

Active Publication Date: 2021-01-15
BEIJING UNIV OF POSTS & TELECOMM
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Assuming that one party's preparation equipment (laser) or detection equipment (single photon detector) cannot work normally, then the two parties cannot share the key to communicate, which undoubtedly limits the practicability of the QKD system

Method used

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  • A fully symmetric quantum key distribution system that can send and receive keys
  • A fully symmetric quantum key distribution system that can send and receive keys
  • A fully symmetric quantum key distribution system that can send and receive keys

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0047] Such as figure 1As shown, take Alice sending a signal state and Bob receiving a signal state as an example. A pulsed laser (1) with a center wavelength of 1550nm emits a pulse signal, which is attenuated to a single photon level after passing through the attenuator (2), and then passes through the circulator (3), (incident from port 3-1, exit from port 3-2 ) enters the X-type fiber coupler (5), and is divided into two entangled pulses (L1, L2) in the upper and lower paths. The L1 pulse exits from the 5-c port, and the L2 pulse exits from the 5-d port.

[0048] L1 pulse: After the L1 pulse reaches the circulator (7), it enters from the 7-1 port, then exits from the 7-2 port, and then passes through the polarization-insensitive phase modulator (8) and the Faraday mirror (9). The phase modulator loads the phase, the phase loaded by Alice ...

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Abstract

The invention aims to design a completely symmetrical quantum key distribution device capable of receiving and sending keys, which is high in speed, high in efficiency, easy to integrate and strong inanti-interference capability. In the device, optical devices in modules of two communication parties are completely the same and symmetrical. The two communication parties can send and receive the secret keys respectively, so that the secret key generation rate is improved by two times, and the flexibility and practicability of secret key transmission are greatly improved. According to the scheme, secret key information is shared by utilizing an unequal-arm Mach-Zehnder interferometer coding scheme, and the interference stability during long-distance communication is ensured by adopting a polarization-insensitive phase modulation scheme consisting of a phase modulator and a Faraday mirror. According to the device, the one-way device is adopted to load the phase information, so that the phase can be accurately loaded at a high speed, Trojan attacks possibly caused when an optical path passes back and forth are avoided, and the safety of a communication system is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber transmission secure communication, in particular to a completely symmetrical quantum key distribution system capable of sending and receiving keys. Background technique [0002] Since the formal establishment of quantum mechanics in the early 20th century, it has continuously influenced the development of technological society. In particular, the proposal of quantum computers seriously threatens the existing classical cryptosystems based on computer complexity. Therefore, Quantum Communication (QC), represented by Quantum Key Distribution (QKD), has received extensive attention based on the principle of quantum mechanics to ensure the unconditional security of the information transmission process. Since the first quantum key distribution protocol, the BB84 protocol, was proposed in 1984, many quantum key distribution protocols and experiments have been proposed one after another. Quantum ke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04B10/40H04B10/508H04B10/548H04B10/70
CPCH04B10/40H04B10/508H04B10/548H04B10/70H04L9/0852
Inventor 马海强窦天琦孙钟齐屈文秀王吉鹏李振华
Owner BEIJING UNIV OF POSTS & TELECOMM
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