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Continuous variable quantum key distribution adaptive coordination method

A technology of quantum key distribution and coordination method, which is applied in the field of continuous variable quantum key distribution adaptive coordination, which can solve problems such as code rate reduction, and achieve the effects of improving coordination, high coordination efficiency, and improving decoding performance

Active Publication Date: 2021-03-26
YANGZHOU UNIV
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  • Application Information

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Problems solved by technology

But the adaptation makes the code rate drop

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  • Continuous variable quantum key distribution adaptive coordination method
  • Continuous variable quantum key distribution adaptive coordination method
  • Continuous variable quantum key distribution adaptive coordination method

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Embodiment

[0056] Such as Figure 1~3 As shown, a continuous variable quantum key distribution adaptive coordination method, assuming code length N=16, code rate R=1 / 2, step size K step =2, the minimum adaptive length K min =4, the specific steps are:

[0057] Step 1. The sending end Alice and the receiving end Bob share the coherent state information of continuous variable quantum key distribution (CVQKD), that is, the sending end Alice sends the coherent state information x, which is transmitted in the quantum channel distributed with Gaussian random noise;

[0058] Bob at the receiving end obtains information y=x+z, z is the channel noise of the quantum channel, which obeys the Gaussian distribution z~N(0,σ 2 ) d ;

[0059] Both parties normalize their coherent state information to get where |*| is the norm of *,

[0060] Step 2. Under the framework of reverse coordination, Bob at the receiving end generates the original key information m, and combines m with CRC to obtain th...

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Abstract

The invention discloses a continuous variable quantum key distribution adaptive coordination method. The method comprises the steps that a sending end and a receiving end share coherent state information; the receiving end generates original key information, encodes and modulates the original key information, forms a group of vectors by every d bits of the modulated information, and performs d-dimensional mapping processing on the vectors and normalized coherence state information to obtain a mapping relationship between the vectors and the normalized coherence state information; the sending end calculates a channel log-likelihood ratio according to the mapping relation, sends the channel log-likelihood ratio to a system code decoder to obtain a decoding result, performs CRC on a decodingresult: if the CRC succeeds, ending the decoding; otherwise, sending the frozen bit information in batches, and combining the newly built frozen bit with the originally owned decoding information to decode again until the check is successful or the maximum cycle index is reached. The method is simple, effective and easy to operate. By utilizing the construction characteristics of the system polarization code, the performance of the adaptive protocol is greatly improved, and a very good transmission effect can still be obtained under a low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of quantum key communication, in particular to an adaptive coordination method for continuous variable quantum key distribution. Background technique [0002] With the advent of quantum computers, traditional information encryption techniques are no longer secure. The powerful operating speed of computers makes traditional encryption no longer safe. In this regard, scientists have proposed an unconditional security technology for quantum communication. Continuous-Variable Quantum Key Distribution (CVQKD, Continuous-Variable Quantum Key Distribution), as an important branch of quantum communication, has attracted more and more attention. [0003] CVQKD's existing adaptive coordination scheme: the communication parties first share coherent state information on the quantum channel; then, the sender generates a random key, uses channel error correction coding to encrypt the information into a codeword sequence, and multi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/15H03M13/09H03H21/00H04L9/08H04B10/40H04B10/70
CPCH03M13/15H03M13/09H03H21/00H04L9/0819H04L9/0858H04B10/40H04B10/70Y02D30/70
Inventor 张梅香窦寅黄誉霆
Owner YANGZHOU UNIV
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