Efficient rate-adaptive reconciliation for CV-QKD protocol

Wang, Xiangyu; Zhang, Yichen; Li, Zhengyu; Xu, Bingjie; Yu, Shanshan; Guo, Hong

doi:10.26421/qic17.13-14-4

Cited by 29 publications

(27 citation statements)

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“…In the following discussion, we consider the squeezed vacuum states with a squeezing level of 13.1 dB and an anti-squeezing level of 25.8 dB, which has experimentally been achieved at 1550 nm with today's technology [50]. We set the reconciliation efficiency β to 95%, which is also easily achievable with CV-QKD's postprocessing method [51,52]. The excess noise is chosen as ε = 0.01, and the security parameters are chosen as ε c = ε s = 10 −9 .…”

Section: Double-data Modulation Methods and The Modified Estimation P...mentioning

confidence: 99%

Improving Parameter Estimation of Entropic Uncertainty Relation in Continuous-Variable Quantum Key Distribution

Chen

Zhang

Wang

et al. 2019

Entropy

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The entropic uncertainty relation (EUR) is of significant importance in the security proof of continuous-variable quantum key distribution under coherent attacks. The parameter estimation in the EUR method contains the estimation of the covariance matrix (CM), as well as the max-entropy. The discussions in previous works have not involved the effect of finite-size on estimating the CM, which will further affect the estimation of leakage information. In this work, we address this issue by adapting the parameter estimation technique to the EUR analysis method under composable security frameworks. We also use the double-data modulation method to improve the parameter estimation step, where all the states can be exploited for both parameter estimation and key generation; thus, the statistical fluctuation of estimating the max-entropy disappears. The result shows that the adapted method can effectively estimate parameters in EUR analysis. Moreover, the double-data modulation method can, to a large extent, save the key consumption, which further improves the performance in practical implementations of the EUR.

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Section: Double-data Modulation Methods and The Modified Estimation P...mentioning

confidence: 99%

Improving Parameter Estimation of Entropic Uncertainty Relation in Continuous-Variable Quantum Key Distribution

Chen

Zhang

Wang

et al. 2019

Entropy

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“…The threshold can be estimated using the density evolution method. Table I presents the degree distributions for the MET-LDPC code rates of 0.05 and 0.02 [24]. The two MET-LDPC codes exhibit excellent error correction performance and are usually used in long-distance CV-QKD systems.…”

Section: Design Of Low-rate Rl-ldpc Codesmentioning

confidence: 99%

“…For example, when the SNR is less than -15 dB, the code rate is less than 0.02 and the block length has an order of 10 6 [23]. However, designing a parity-check matrix with good performance is complex, and it is extremely complicated to design all matrices for different SNRs [24]. Therefore, to improve the reconciliation efficiency, the system must change the modulation variance at Alice's side to ensure the receiving variables achieve the target SNR.…”

Section: Introductionmentioning

confidence: 99%

Rate compatible reconciliation for continuous-variable quantum key distribution using Raptor-like LDPC codes

Zhou,

Wang,

Zhang

et al. 2021

Preprint

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In the practical continuous-variable quantum key distribution (CV-QKD) system, the postprocessing process, particularly the error correction part, significantly impacts the system performance. Multi-edge type low-density parity-check (MET-LDPC) codes are suitable for CV-QKD systems because of their Shannon-limit-approaching performance at a low signal-to-noise ratio (SNR). However, the process of designing a low-rate MET-LDPC code with good performance is extremely complicated. Thus, we introduce Raptor-like LDPC (RL-LDPC) codes into the CV-QKD system, exhibiting both the rate compatible property of the Raptor code and capacity-approaching performance of MET-LDPC codes. Moreover, this technique can significantly reduce the cost of constructing a new matrix. We design the RL-LDPC matrix with a code rate of 0.02 and easily and effectively adjust this rate from 0.016 to 0.034. Simulation results show that we can achieve more than 98% reconciliation efficiency in a range of code rate variation using only one RL-LDPC code that can support high-speed decoding with an SNR less than -16.45 dB. This code allows the system to maintain a high key extraction rate under various SNRs, paving the way for practical applications of CV-QKD systems with different transmission distances.

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“…Several experimental tests [40,44,45] have shown the capacity of CV-QKD to achieve high-rate secure communication over metropolitan distances [46] and beyond [47]. Recent studies focused on improving the achievable distance by Gaussian post-selection [48,49], exploiting noiseless linear amplifier [50], and also refining the performance of classical error correction and privacy amplification stages [51,52]. Others works have shown the feasibility of CV-QKD at wavelengths longer than optical down to the microwave regime [41][42][43], also incorporating finite-size effects [53] In this work, we study the feasibility of CV-QKD at the terahertz and the extended terahertz range, i.e., from 100 GHz to 50 THz.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Quantum Cryptography

Ottaviani

Woolley

Erementchouk

et al. 2020

IEEE J. Select. Areas Commun.

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A well-known empirical rule for the demand of wireless communication systems is that of Edholm's law of bandwidth. It states that the demand for bandwidth in wireless short-range communications doubles every 18 months. With the growing demand for bandwidth and the decreasing cell size of wireless systems, terahertz (THz) communication systems are expected to become increasingly important in modern day applications. With this expectation comes the need for protecting users' privacy and security in the best way possible. With that in mind, we show that quantum key distribution can operate in the THz regime and we derive the relevant secret key rates against realistic collective attacks. In the extended THz range (from 0.1 to 50 THz), we find that below 1 THz, the main detrimental factor is thermal noise, while at higher frequencies it is atmospheric absorption. Our results show that high-rate THz quantum cryptography is possible over distances varying from a few meters using direct reconciliation, to about 220m via reverse reconciliation. We also give a specific example of the physical hardware and architecture that could be used to realize our THz quantum key distribution scheme. * Electronic address: carlo.ottaviani@york.ac.uk † Electronic address: stefano.pirandola@york.ac.uk exhibit very little degradation in performance compared to free-space optical links [9][10][11][12]. Under fog conditions, free-space optical links are completely blocked while THz links exhibit minimal impact. Similar transmission windows can be exploited at the MIR and FIR ranges, in particular, between 15 and 34 THz [13]. A detailed analysis of the propagation properties of THz signals for wireless communications in atmosphere can be found, for instance, in Ref. [14][15][16].An important aspect of THz communication is that of achieving the highest levels of security possible where secure distances need to range from 1 m up to 1 km. Applications for secure links include stealthy short distance communications between military personnel and vehicles (manned or unmanned). Security has been considered before in terms of THz communication by exploiting various characteristics and properties of the THz band [2,3]. Unfortunately, the security of all such 'classical' communication schemes have their limit in the sense that they can never be unconditionally secure. This problem can be fixed by quantum key distribution (QKD) [17][18][19]. QKD profits from the peculiar properties of quantum physics and quantum information [20][21][22], in particular the no-cloning theorem [23] and the monogamy of entanglement [24], to achieve levels of security that are not possible using classical cryptography.Continuous-variable (CV) QKD [19,25,26] has attracted increasing attention in the last years. This is due to the high rates achievable that allow one to approach the ultimate limit of point-to-point private communication [27][28][29], i.e., the Pirandola-Laurenza-Ottaviani-Banchi (PLOB) bound [27], equal to − log 2 (1 − T ) se-

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Efficient rate-adaptive reconciliation for CV-QKD protocol

Cited by 29 publications

References 0 publications

Improving Parameter Estimation of Entropic Uncertainty Relation in Continuous-Variable Quantum Key Distribution

Improving Parameter Estimation of Entropic Uncertainty Relation in Continuous-Variable Quantum Key Distribution

Rate compatible reconciliation for continuous-variable quantum key distribution using Raptor-like LDPC codes

Terahertz Quantum Cryptography

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