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

A quantum key and non-orthogonal technology, which is applied in the field of quantum key sharing based on discrete modulation non-orthogonal states, can solve the problem that remote users cannot recover key information alone, cannot guarantee the key sharing requirements of multiple users, and cannot To ensure the reliability of remote users and other issues, to achieve the effect of easy preparation and measurement, good anti-interference ability and high reliability

Active Publication Date: 2020-12-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0040] Such as figure 1 Shown is a schematic flow chart of the method of the present invention: the quantum key sharing method based on the discrete modulation non-orthogonal state provided by the present invention comprises the following steps:

[0041] S1. Both the terminal and the n remote users access a common optical fiber channel;

[0042] S2. The remote user farthest from the terminal prepares the modulated non-orthogonal state by itself, and sends the non-orthogonal state to the remote user closest to him;

[0043]S3. The remote user in the receiving state receives the data signal, prepares the modulated non-orthogonal state by itself, and injects the non-orthogonal state into the received data signal (such as using a highly asymmetric fractionator), and injects the non-orthogonal state into the received data signal. The data signal is sent to the nearest remote user who has not injected non-orthogonal state again;

[0044] S4. Step S3 is repeated until all remote us...

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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...

Claims

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0858
Inventor 廖骎肖港
Owner HUNAN UNIV
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