Measurement device independent quantum key distribution system and method based on W state

A technology for quantum key distribution and measurement equipment, which is applied in the field of measurement equipment-independent quantum key distribution system based on W state, can solve the problems of low utilization efficiency of coding efficiency system devices, and achieves increased safe transmission distance, mature and reliable technology, Robust effect
CN108199768AActive Publication Date: 2018-06-22NAT QUANTUM COMM GUANGDONG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NAT QUANTUM COMM GUANGDONG CO LTD
Publication Date
2018-06-22

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Abstract

The invention discloses a measurement device independent quantum key distribution system and method based on a W state. The system comprises four quantum terminal units and one quantum terminal unit.Pulsed lasers of the four quantum terminal units transmit laser of a specified wavelength, the phase of [0, 2 phi] is randomly modulated by a phase modulator, horizontal, vertical, +45-degree or -45-degree polarization is randomly loaded by a polarization controller, a decoy state or a signal state is marked by a strength modulator, and finally, the laser is attenuated by an adjustable attenuatorto an average photon number theoretically calculated and optimized and then transmitted to a quantum relay unit. The quantum relay unit performs W state projection measurement on signals transmitted through a quantum channel; according to the response of a detector, the quantum relay unit publishes the measurement result, and two are randomly selected from the four quantum terminal units to publish quantum states; if the quantum states of the two are anti-dependent, the data is discarded; and if the quantum states of the two are dependent, the remaining two are bit-flipped to obtain a shared password. The system and the method for quantum key distribution using the W state have better adaptability to the environment, and are low in cost by adopting mature basic linear optical components.
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Description

technical field

[0001] The present invention relates to the technical field of quantum information and optical communication, in particular to a measurement device-independent quantum key distribution system and method based on a W state. Background technique

[0002] Since Bennett and Brassard proposed the first Quantum Key Distribution (Quantum Key Distribution, QKD) "BB84" in 1984, it has benefited from the combination of channels (optical fibers) and devices (such as beam splitters, avalanche photodiodes, APDs) in optical transmission networks. With continuous progress, QKD has become the closest practical technology in the field of quantum information. QKD can realize that in the presence of an eavesdropper, the legitimate communication parties (usually referred to as Alice and Bob) share a theoretically absolutely secure quantum key. Combined with "One Time Pad (OTP)" technology, Alice and Bob can achieve absolutely secure communication through quantum keys.

[0003] ...

Claims

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