Plug-and-play measuring device independent quantum key distribution network system and method

Abstract

The invention discloses a plug-and-play measuring device independent quantum key distribution network system and a method. The method includes steps: a quantum relay unit emits two channels of pulses,the pulses are respectively transmitted to two designated quantum terminal units through a quantum channel, the quantum terminal units encode the input light pulses and transmit the pulses back to the quantum relay unit through the quantum channel, and the quantum relay unit conducts a Bell-state analysis on the pulses modulated through the quantum terminal units, obtains a result and publishes the result through a classic channel; and the quantum terminal units compare the above result and local encoding information, obtains a screening node and selects a part for error code rate detection,if the result is safe, the communication is successful, and if the result is not safe, the communication is given up and restarted. The problems of the influence of the environment on photon polarization in practical application and key distribution multi-user application in the network are solved.

Description

technical field [0001] The invention relates to the technical fields of quantum information and optical communication, in particular to a quantum key distribution network system and method independent of plug-and-play measurement equipment. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD is the product of the combination of quantum mechanics and information science, allowing legitimate users Alice and Bob to share theoretically absolutely secure passwords, combined with a one-time pad encryption system, to achieve the currently available Proven only secure communication. [0003] However, because the actual device and environment are different from the ideal, the security of quantum key distribution in practical applications has been greatly challenged. For example, the PNS attack (photon number splitting attack) targeting the commonly used quasi-single photon source in the weak coherent state, and the detector blinding attack and time-...

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Problems solved by technology

[0010] The present invention is made in view of the above problems, and the purpose is to overcome the deficiencies of the prior art, provide a plug-and-play measurement device-independent quantum key distribution network system and method, and solve the problem of the stability of photons affected by the environment and the stability of photons in practical applications. The problem of key distribution in the network

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