Underwater reciprocating type continuous variable quantum key distribution system and method thereof

A quantum key distribution and round-trip technology, applied in key distribution, can solve problems such as vulnerability to third-party attacks and reduced security, achieve automatic compensation for polarization drift, and improve system stability

Inactive Publication Date: 2020-08-11
CENT SOUTH UNIV
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Problems solved by technology

Same as Gaussian modulation, in the process of discretely modulated underwater continuous variable quantum key distribution, in addition to quantum signal light, there is also classical local oscillator light transmitted on the channel, which is used as reference light for quantum state detection , and the local oscillator is vulnerable to third-party attacks when it is transmitted on the seawater channel, which reduces the security of the system. Therefore, how to avoid eavesdroppers' attacks on the local oscillator is particularly important

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  • Underwater reciprocating type continuous variable quantum key distribution system and method thereof

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] Such as figure 1 As shown, the embodiment of the present invention underwater round-trip continuous variable quantum key distribution system, including:

[0045] Light source sending end: used to generate the original signal light and local oscillator light, leave the local oscillator light at the light source sending end, and send the original signal light to the quantum signal encoding end through the forward water channel (that is, the seawater class...

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Abstract

The invention discloses an underwater reciprocating continuous variable quantum key distribution system and method. The system comprises a light source sending end, a quantum signal coding end and a quantum signal receiving end. The light source sending end is used for generating original signal light and local oscillation light, leaving the local oscillation light at the light source sending end,and sending the original signal light to the quantum signal coding end through a forward water channel; the quantum signal encoding end is used for receiving the original signal light, encoding quantum information on a phase component of an original signal light field, and then sending the signal light loaded with the quantum information to the quantum signal receiving end through a reverse waterchannel; and the quantum signal receiving end shares one port with the light source sending end, detects the received quantum signal light by taking the local oscillation light remained at the lightsource sending end as a reference, and feeds back a detection result to the quantum signal coding end through a forward water channel. According to the invention, local oscillation light is preventedfrom being attacked, polarization drift can be automatically compensated in the communication process, and the system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of water channel quantum communication, and relates to an underwater round-trip continuous variable quantum key distribution system and a method thereof. Background technique [0002] Continuous variable quantum key distribution is a cutting-edge technology in the field of quantum encryption. It avoids the risk of eavesdropping on classical communication technology to a certain extent, and lays a theoretical and experimental foundation for the establishment of an unconditionally secure quantum communication network. Up to now, the unconditionally secure continuous variable quantum key distribution protocol has been applied in optical fiber and free space atmospheric channel, but the continuous variable quantum key distribution technology based on water channel is not mature. The ocean occupies more than 70% of the earth's area. Improving the underdeveloped underwater quantum communication is an inevitable pa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B13/02H04B10/70
CPCH04B10/70H04B13/02H04L9/0858
Inventor 阮新朝张航赵微吴琼
Owner CENT SOUTH UNIV
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