Quantum key sharing method based on discrete modulation non-orthogonal state

Abstract

The invention discloses a quantum key sharing method based on a discrete modulation non-orthogonal state. The quantum key sharing method comprises a terminal and a remote user access optical fiber channel. Starting from the remote user at the farthest end, each remote user injects discretely modulated non-orthogonal state injection data information until all the remote users are injected and sentto the terminal; the terminal measures the data information to obtain a measurement result; the steps are repeated; transmissivity of a quantum channel from each remote user to the terminal is determined; the terminal recalculates the measurement result to obtain a final measurement result, and establishes a point-to-point continuous variable quantum key distribution link from the remote user to the terminal; a security key rate of each distribution link is calculated and a final security key rate is selected; the terminal judges the final security key rate to enable the terminal and each remote user to share different keys; and the terminal completes sharing of the target information among all remote users. According to the method, multi-user quantum key sharing can be met, the reliability is high, and the real-time performance is good.

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

Images