Free space quantum key distribution system and method for aircraft

Abstract

The invention discloses a free space quantum key distribution system and method for an aircraft. Theoretically absolutely safe point-to-point quantum secret communication can be realized between an aircraft carrying the quantum key distribution equipment and any aircraft or ground station carrying the equipment. A communication sender attenuates strong laser to obtain quasi-single-photon laser with an average photon number in the single-photon level, then performs polarization state modulation on the quasi-single-photon laser according to a polarization BB84 protocol, and sends the quasi-single-photon laser to a receiver through an optical antenna via a free space. And the receiver receives the single photon from the sender through the optical antenna, and demodulates key information carried by the single photon through a quantum signal receiving system. Because the single photon in the unknown quantum state has the characteristics of non-replicability and non-divisibility, the third party cannot steal the key information of the two communication parties without being discovered, and the security of the aircraft communication information is ensured.

Description

technical field [0001] The invention relates to the field of quantum key distribution, in particular to a free-space quantum key distribution system and method for aircraft. Background technique [0002] With the widespread popularization of the Internet, information transmission has reached an unprecedented quantity and frequency, and various private information is increasingly exposed on the Internet. Therefore, people's demand for confidential communication has also reached an unprecedented height. Quantum key distribution uses the quantum state as the information carrier. Based on the uncertainty relationship of quantum mechanics and the quantum non-cloning theorem, the communication parties share the key through the quantum channel. It is the product of the combination of cryptography and quantum mechanics. Quantum key distribution technology does not transmit ciphertext in communication, but only uses quantum channels to transmit keys and distribute keys to both partie...

AI Technical Summary

Problems solved by technology

However, it only involves quantum secure communications between two aircraft, and does not involve secure communications between aircraft and fixed ground stations, mobile ground or sea vehicles

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