Multi-user TF-QKD network system and multi-user TF-QKD network method

Abstract

The invention discloses a multi-user TF-QKD network system and a multi-user TF-QKD network method. The system comprises N sending ends, N measuring ends, N optical path selection modules and an annular quantum network, and the N sending ends, the N measuring ends and the N optical path selection modules are connected through the annular quantum network. Each sending end comprises a laser, an intensity modulator, a phase modulator and an optical attenuator; the measuring end is configured to emit single photon interference and comprises two single photon detectors and a beam splitter; and the scheme that multiple users carry out multiple sets of TFQKD protocols at the same time is achieved, the high code forming rate is achieved under long-distance quantum communication, attacks on a measuring end can be resisted, expansibility is achieved, the number of the users can be continuously increased, the function that quantum information of any two users can be detected at any measuring end is achieved, the utilization rate of quantum network resources is greatly improved, and meanwhile a large number of quantum network resources are saved.

Description

technical field [0001] The invention relates to the fields of quantum security communication and optical communication, in particular to a multi-user TF-QKD network system and method. Background technique [0002] Quantum communication is a theoretically unconditionally secure communication method based on quantum mechanics, which enables the two parties to communicate (generally referred to as the sender Alice and the receiver Bob) to achieve secure communication in the presence of an eavesdropper (Eve). As one of the core technologies of quantum communication, Quantum Key Distribution (QKD) has always been the focus of research in the field of quantum communication. However, the actual QKD system is restricted by the environment and existing technologies, and there are various security loopholes; at the same time, because quantum communication is at the single-photon level, it is affected by environmental noise, transmission loss, etc., and the distance of quantum communic...

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Problems solved by technology

[0006] However, the current TF-QKD can only achieve one-to-one quantum communication

However, with the development of quantum communication, networking has become an inevitable trend. One-to-one quantum communication can no longer meet the needs of multi-node and multi-user quantum networks. In 2015, Fu Yao et al. proposed a GHZ-based entanglement In the same year, Xu Feihu and others proposed a multi-party MDI-QKD scheme based on W state

But these schemes are only schemes based on the MDI-QKD protocol, and the coding rate of the longest distance MDI-QKD experiment (404km) realized so far is only 10 -12 Magnitude

In a quantum network covering a large area, when long-distance quantum communication is required, such a coding rate is obviously far from enough

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