HD-qkd quantum state preparation method, distribution method and device

Abstract

The application provides a preparation method, distribution method and device of HD-QKD, wherein in the preparation method of HD-QKD of the present application, when X base vector is selected to prepare a quantum state, only one quantum state |X> is prepared, thus It can be seen that there is only one kind of quantum state prepared by the X base vector of the present application, which is far less than the difficulty of preparing d quantum in the prior art, and the number of photodetectors required is also small, and the number of photodetectors only needs one Therefore, it not only greatly reduces the detection difficulty, but also saves the photodetector and reduces the cost of the equipment. There is only one type of quantum state prepared by the HD-QKD of the present application, so the number of unequal interferometers in the detection module will be greatly reduced, so the error of the arm length difference of the unequal interferometer is easy to control, greatly reducing The manufacturing difficulty of the detection module is reduced, and the volume of the device is reduced.

Description

technical field [0001] The present application relates to the technical field of quantum communication, in particular to a preparation method, distribution method and device of HD-QKD. Background technique [0002] Quantum key distribution (QKD) uses the quantum properties of matter (such as photons) to design encryption and decryption schemes. Its security is based on the basic principles of quantum mechanics rather than the complexity of mathematical calculations. QKD uses the Heisenberg uncertainty principle and the unknown quantum state non-cloning principle to discover the existence of eavesdropping, which theoretically ensures the unconditional security of information. In practical applications, QKD uses this principle to enable two parties who have not shared secret information in advance to establish a communication key, and then use the "one-time pad" cipher communication that Shannon has proved to ensure the communication security of both parties. [0003] The sim...

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Problems solved by technology

[0007] This application provides a preparation method, distribution method and device of HD-QKD to solve the problem that HD-QKD not only has a very complicated and cumbersome method of preparing quantum states in the prior art, but also has a very complicated structure of detection and decoding devices

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