Information coordination method easily implemented by hardware in quantum key distribution

A technology of quantum key distribution and hardware implementation, which is applied in the field of quantum information, can solve the problems affecting the speed of quantum key distribution and the consumption of punching schemes, and achieve the effect of low storage capacity

Active Publication Date: 2014-10-08
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

When actually implementing the puncturing and truncation scheme, the locations of the puncturing and truncation must be carefully chosen, which introduces addi

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  • Information coordination method easily implemented by hardware in quantum key distribution
  • Information coordination method easily implemented by hardware in quantum key distribution
  • Information coordination method easily implemented by hardware in quantum key distribution

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Embodiment 1

[0019] Embodiment 1: An information coordination method in quantum key distribution that is convenient for hardware implementation. Set the two parties for information coordination as A and B. After A and B pre-generate the mother code and sub-code, the base matrix of the mother code and The policy of row merging is stored; among them, the information coordination steps are as follows:

[0020] Step 1, A and B estimate the error rate of the channel by random sampling; Step 2, A and B select a suitable LDPC (Low Density Parity Check, Low Density Parity Check) code through the line combination method, and A uses the obtained Syndrome S 1 =H×X T Send to B, X represents the key string in the hands of A; step 3, B receives S 1 Finally, find the syndrome S corresponding to the key string Y in your hand 2 =H'Y T , if S 1 and S 2 If they are the same, it means that A and B have the same key string; if they are different, then B according to S 1 Perform decoding and error correc...

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Abstract

The invention relates to the technical field of quantum information, and particularly relates to an information coordination method easily implemented by hardware in quantum key distribution. The two parties of information coordination are set as A and B, and after A and B pre-generate a mother code and a son code, a strategy for basis matrix and row combination of the mother code is stored. (1) A and B estimate the error rate of a channel through random sampling; (2) A and B select an appropriate low-density parity check code through a row combination method, A sends a solved syndrome S1=H*X<T> to B, wherein X refers to a key string of A; and (3) after receiving S1, B works out a syndrome S2=H*Y<T> corresponding to a key string Y of B. If S1 and S2 are the same, A and B have the same key string. If S1 and S2 are different, B performs decoding correction according to S1 and returns a decoding result to A. A protocol ends if decoding succeeds, and a section of data is abandoned if decoding fails. The low-density parity check (LDPC) code adopted in the invention has a quasi cyclic structure, is easily implemented by hardware and is high in decoding speed.

Description

technical field [0001] The invention relates to the technical field of quantum information, in particular to an information coordination method in quantum key distribution which is convenient for hardware implementation. Background technique [0002] Quantum key distribution is one of the important applications of quantum information science. Quantum key distribution is unconditionally secure even if an eavesdropper has infinite computing power. The role of quantum key distribution is to allow legitimate communication parties to share a string of completely consistent keys. Currently the most widely used quantum key distribution protocol is the BB84 protocol. The post-processing of quantum key distribution is divided into two parts: information coordination and secrecy amplification. The purpose of secrecy amplification is to reduce the information that eavesdroppers may have. After the communication parties Alice and Bob complete the base pairing on the authenticated cla...

Claims

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Application Information

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IPC IPC(8): H04L9/08
Inventor 马智魏正超高明曾光王洪李宏欣
Owner THE PLA INFORMATION ENG UNIV
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