Quantum key distribution after-treatment system and method based on polar code correction

A quantum key distribution and polar code technology, applied in the field of quantum key distribution post-processing systems based on polar code error correction, can solve the problems of time delay and bit overhead, and reduce the key generation rate of quantum key distribution.

Active Publication Date: 2016-11-23
JINAN UNIVERSITY
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Problems solved by technology

The existing post-processing of quantum key distribution has certain limitations in speed and efficiency. The main problem lies in the time delay and bit overhead caused by the two parts of error correction

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  • Quantum key distribution after-treatment system and method based on polar code correction
  • Quantum key distribution after-treatment system and method based on polar code correction
  • Quantum key distribution after-treatment system and method based on polar code correction

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Embodiment Construction

[0055] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0056] like figure 1 As shown, a post-processing system for quantum key distribution based on polar code error correction provided in this embodiment includes: a key screening module, a parameter estimation module, a polar code error correction module, and a consistency check module connected in sequence module and the tightness amplification module, where

[0057] The key screening module: After the sender and the receiver complete the qubit information transmission on the quantum channel, the sender and the receiver disclose the modulation base and the measurement base respectively, and select different original keys for the elimination base, and retain the base selection The same...

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Abstract

The invention discloses a quantum key distribution after-treatment system and a quantum key distribution after-treatment method based on polar code correction. The system comprises a key screening module, a parameter estimation module, a polar code correction module, a consistency verification module and a privacy amplification module which are connected in sequence. The method comprises the following steps: only keeping original keys with the same base selection to form screening keys after quantum bite information is transmitted on a quantum channel; commonly selecting partial key bits from the screening keys to perform disclosed comparison; coding and decoding undisclosed key bits by adopting a system polar code algorithm under the condition that the quantum bit error rate is not higher than a safety threshold value; verifying the consistence of the corrected quantum keys by adopting cryptographic algorithm; and calculating safety information entropy and performing information compression to obtain absolutely safe key bits. The quantum key distribution after-treatment system has linear coding/decoding complexity characteristics, so that the after-treatment time delay and key length increase have linear relationship, and the after-treatment speed is improved.

Description

technical field [0001] The invention relates to the technical field of communication and information security, in particular to a post-processing system and method for quantum key distribution based on polar code error correction. Background technique [0002] Quantum Key Distribution (Quantum Key Distribution, QKD) can distribute security keys for both parties in the communication in an absolutely secure manner. Combining with the "one-time pad" encryption scheme, it can build a security system that cannot be broken by quantum computers. It is an important direction of interdisciplinary research between information security and quantum physics in the post-quantum era. At the same time, quantum key distribution is also the first practical technology of quantum information science. Its unconditional security is of great significance and role in the information security and protection of military, banking, government, etc., so it has been accepted by governments all over the w...

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0819H04L9/0858
Inventor 方俊彬蒋琳邹云颜士玲余小龙
Owner JINAN UNIVERSITY
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