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Quantum secret key distributing system and method

A quantum key and quantum random number technology, applied in the field of quantum communication, can solve problems such as reducing the coding rate, and achieve the effects of increasing the coding rate, reducing the demand, increasing the transmission distance and the key generation rate

Pending Publication Date: 2018-06-05
TSINGHUA UNIV
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Problems solved by technology

In addition, when the number of L is too large, if the sending rate of the light source is constant, the number L itself will have a linear decrease in the coding rate

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  • Quantum secret key distributing system and method

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Embodiment Construction

[0053] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] figure 1 It is a schematic structural diagram of the quantum key distribution system in the embodiment of the present invention. Such as figure 1As shown, the quantum key distribution system in the embodiment of the present invention includes: a sending end 10 and a receiving end 20;

[0055] A quantum channel 30 and a classical channel 40 are arranged between the sending end 10 and the receiving end 20;

[0056] The sending end 10 includes: a laser 11, a first quantum random number generator 12, a signal state and decoy state encoder 13, a phase modulator 14, a second quantum random number generator 15, a register 16, a first transceiver 17 and a first quantum key generator 18;

[0057] The receiving end 20 includes: a first beam spli...

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Abstract

The invention provides a quantum secret key distributing system and method. The quantum secret key distributing system comprises a sending end and a receiving end, wherein a quantum channel and a classical channel are formed between the sending end and the receiving end; the sending end comprises a laser device, a first quantum random number generator, a signal state and decoy state encoder, a phase modulator, a second quantum random number generator, a register, a first transceiver and a first quantum secret key generator; and the receiving end comprises a first beam splitter, a second beam splitter, a translation device, a third quantum random number generator, a first detector, a second detector, a second transceiver and a second quantum secret key generator. According to the quantum secret key distributing system, the requirements of the whole system for the number of signals can be reduced, the coding rate of the system can be increased, and the transmission distance of a quantumsecret key and the generation speed of the secret key can be increased.

Description

technical field [0001] The present application relates to the technical field of quantum communication, in particular to a decoy state-based quantum key distribution system and method. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) protocol has very broad application prospects. It has been widely used in fields that require high-level security, such as the National Day military parade, the National People's Congress, and some banks and government agencies. Unlike classical communication, the security of quantum key distribution protocols is guaranteed by the fundamental laws of quantum mechanics. Among them, the most widely used is the BB84 protocol. [0003] The security of the quantum key distribution protocol in the prior art is based on the Heisenberg uncertainty relation, specifically, the eavesdropping operation on the channel will inevitably interfere with the signal transmitted in the channel. That is to say, if the transmit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852H04L9/0858H04L9/0869
Inventor 马雄峰周泓伊
Owner TSINGHUA UNIV
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