Quantum Key Sharing Method Based on Discretely Modulated Nonorthogonal States

Abstract

The invention discloses a quantum key sharing method based on a discrete modulation non-orthogonal state, which includes a terminal and a remote user accessing a fiber channel; Inject data information until all remote users inject and send it to the terminal; the terminal measures the data information to obtain a measurement result; repeat the above steps; determine the transmittance of the quantum channel from each remote user to the terminal; the terminal recalculates the measurement result to obtain the final measurement result, Establish a point-to-point continuous variable quantum key distribution link from remote users to terminals; calculate the security key rate of each distribution link and select the final security key rate; the terminal determines the final security key rate so that the terminal can share it with each remote user Different keys; the terminal accomplishes the sharing of target information among all remote users. The method of the invention can satisfy the multi-user quantum key sharing, and has high reliability and good real-time performance.

Description

technical field [0001] The invention belongs to the field of quantum secret communication, and in particular relates to a quantum key sharing method based on a discrete modulation non-orthogonal state. Background technique [0002] With the development of economy and technology and the improvement of people's living standards, communication has been widely used in people's production and life, bringing endless convenience to people's production and life. With the advent of the intelligent age, people pay more and more attention to the security of communication. [0003] Continuous variable quantum key distribution is a point-to-point key distribution realized on an untrusted quantum channel, and its security can be guaranteed by the principle of quantum mechanics. The sender (Alice) encodes the orthogonal components in the quantum state phase space, and then the receiver (Bob) uses coherent detection technology to measure the state of the input signal. Finally, after the po...

AI Technical Summary

Problems solved by technology

[0005] In addition, with the rapid development of quantum communication networks, there have been more and more scenarios where multiple users (at least 3 users) need to share keys: for example, a legitimate terminal wants to communicate with multiple users through an untrusted quantum channel. remote users for key sharing, but the terminal cannot ensure the reliability of all remote users, so he must ensure that each remote user cannot individually recover the overall key information

[0006] However, the current point-to-point continuous variable quantum key distribution system cannot guarantee the key sharing requirements of multiple users (at least 3 users), thus restricting the development of the industry

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