Quantum key allocation method, transmission device and receiving device

Abstract

The embodiment of the invention relates to the field of quantum communication, in particular to a quantum key allocation method, transmission device and receiving device, and aims to recover an original key more accurately in a quantum key allocation process. In the embodiment of the invention, the frequency of a pulse included in a first optical pulse signal is greater than the frequency of a pulse included in a second optical pulse signal, so that a time interval between a pulse of a quantum optical signal and a pulse of an adjacent reference optical signal is relatively small; an error is reduced when a receiving device measures phase frequency information between the pulse of the reference optical signal and an intrinsic optical signal and estimates phase frequency information between the pulse of the quantum optical signal and the intrinsic optical signal; coherent coupling modulation of the intrinsic optical signal on the quantum optical signal according to the phase frequency information between the pulse of the quantum optical signal and the intrinsic optical signal with the error being lowered is more accurate; and the original key recovered from the quantum optical signal is more accurate.

Description

Technical field [0001] The embodiments of the present invention relate to the field of quantum communication, and in particular to a quantum key distribution method, a sending device, and a receiving device. Background technique [0002] With the rapid development of network technology, a large amount of sensitive information needs to be transmitted over the network, and people need to protect sensitive information from loss or attack. Encryption is one of the important means to ensure information security. The existing classic encryption system is based on computational complexity, which may be deciphered. In the classical cryptosystem, only one-time password has unconditional security, and how to generate a large number of random number keys has always been a problem. The emergence of Quantum Key Distribution (QKD) technology has solved this problem. [0003] QKD specifically uses quantum states as the information unit, and uses some principles of quantum mechanics to transmit a...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the sending device generates the local oscillator optical signal, and transmits the local oscillator optical signal and the quantum optical signal on the same optical fiber. At this time, if the receiving device wants to accurately recover the original key, it is necessary to strictly ensure that the local oscillator The arrival time of the optical signal and the quantum optical signal at the input end of the 2:2 coupler, that is to say, the receiving device needs to strictly control the equal length of the paths that the local oscillator optical signal and the quantum optical signal pass through. This technical solution It is very difficult in engineering use

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