One-way information reconciliation schemes of quantum key distribution

With the rapid improvement of quantum computing technology,quantum key distribution(QKD)is a hot technology.Information reconciliation is a key step of QKD which is useful for correcting key error.Classical message interaction is necessary in a practical information reconciliation scheme,which makes the efficiency of these protocols decreased.Therefore,some one-way information reconciliation schemes based on low-density parity-check(LDPC)codes and polar codes are proposed.Here we propose a concatenated method of IR schemes which can achieve any given error rate level without the need of interactions.Compared with the one-way IR schems based on LDPC codes and polar codes,the IR schemes based on the proposed concatenated method can get lower bit error rates after error correction,which can also reduce the communication delay and system complexity of QKD,improve the final key generation rate and enhance the practicability of QKD system.

One-way information reconciliation schemes of quantum key distribution

With the rapid improvement of quantum computing technology,quantum key distribution(QKD)is a hot technology.Information reconciliation is a key step of QKD which is useful for correcting key error.Classical message interaction is necessary in a practical information reconciliation scheme,which makes the efficiency of these protocols decreased.Therefore,some one-way information reconciliation schemes based on low-density parity-check(LDPC)codes and polar codes are proposed.Here we propose a concatenated method of IR schemes which can achieve any given error rate level without the need of interactions.Compared with the one-way IR schems based on LDPC codes and polar codes,the IR schemes based on the proposed concatenated method can get lower bit error rates after error correction,which can also reduce the communication delay and system complexity of QKD,improve the final key generation rate and enhance the practicability of QKD system.

Secret Key Generation Based on Two-Way Randomness for TDD-SISO System

A novel secret key generation(SKG)method based on two-way randomness is proposed for TDD-SISO system.The legitimate transceivers mutually transmit their own random signal via reciprocal wireless channel,then the multiplication of transmitted and received signal is used as common randomness to generate secret keys.In quasi-static channel,the theoretical SKG rates(SKGRs)of the three SKG methods,namely wireless channel based,one-way randomness and two-way randomness,are derived and compared.Further,two practical SKG schemes based on twoway randomness,Scheme-1bit and Scheme-3bit,are completely designed and simulated.Generally,Scheme-1bit applies to low signal to noise ratio(SNR)scenarios and achieves 0.13~0.86bit/T_s SKGR and 10^(-2)~10^(-5) level secret key outage probability(SKOP),while Scheme-3bit fits high SNR situation and obtains 0.93~1.35bit/T_s SKGR and 10^(-3)~10^(-4) level SKOP.At last,the national institute of standards and technology(NIST)test is conducted to evaluate the secret key randomness(SKRD)and the test results show that both of the proposed schemes have passed the test.