Long-distance continuous-variable quantum key distribution with efficient channel estimation

Ruppert, László; Usenko, Vladyslav C.; Filip, Radim

doi:10.1103/physreva.90.062310

Cited by 84 publications

(74 citation statements)

References 23 publications

(56 reference statements)

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“…[51]. The only but crucial difference, in our case, is the presence of the contribution from thermal noise V th , which appears in V .…”

Section: Finite-size Descriptionmentioning

confidence: 99%

“…These are evaluated adapting the estimation theory developed in Ref. [51] suitably extended to the case of thermal protocols. We focused on the protocol used in direct reconciliation because it is known that one-way protocols in reverse reconciliation cannot work at micro-wave frequencies.…”

Section: Discussionmentioning

confidence: 99%

“…Now, assuming the general case of moderately squeezed initial states, we can write the confidence intervals which are taken [51] as follows…”

Section: Appendix A: No-switching Protocolmentioning

confidence: 99%

“…In this section, we quantify the impact of finite-size effects by adapting the approach described in Ref. [51], which is fairly simple to generalize to the thermal case. We can define two statistical variables M i and B i , for i = 1, .…”

Section: Finite-size Descriptionmentioning

confidence: 99%

“…[51] for coherent state CV QKD. This allows us to quantify the performance of thermal QKD under more realistic assumptions than in previous studies.…”

Section: Introductionmentioning

confidence: 99%

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Gaussian one-way thermal quantum cryptography with finite-size effects

Papanastasiou¹,

Ottaviani²,

Pirandola³

2018

Phys. Rev. A

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Article:Papanastasiou, Panagiotis, Ottaviani, Carlo orcid.org/0000-0002-0032-3999 and Pirandola, Stefano orcid.org/0000-0001-6165-5615 (2018) Gaussian one-way thermal quantum cryptography with finite-size effects. Physical Review A. 032314. pp. We study the impact of finite-size effects on the security of thermal one-way quantum cryptography. Our approach considers coherent/squeezed states at the preparation stage, on the top of which the sender adds trusted thermal noise. We compute the key rate incorporating finite-size effects, and we obtain the security threshold at different frequencies. As expected finite-size effects deteriorate the performance of thermal quantum cryptography. Our analysis is useful to quantify the impact of this degradation on relevant parameters like tolerable attenuation, transmission frequencies at which one can achieve security.

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“…[51]. The only but crucial difference, in our case, is the presence of the contribution from thermal noise V th , which appears in V .…”

Section: Finite-size Descriptionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Now, assuming the general case of moderately squeezed initial states, we can write the confidence intervals which are taken [51] as follows…”

Section: Appendix A: No-switching Protocolmentioning

confidence: 99%

Section: Finite-size Descriptionmentioning

confidence: 99%

“…[51] for coherent state CV QKD. This allows us to quantify the performance of thermal QKD under more realistic assumptions than in previous studies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Gaussian one-way thermal quantum cryptography with finite-size effects

Papanastasiou¹,

Ottaviani²,

Pirandola³

2018

Phys. Rev. A

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Finite‐Size Analysis of Thermal States Quantum Cryptography with the Optimal Noise

Yang

Qiu

Chen³

et al. 2021

Annalen der Physik

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A modified thermal states quantum cryptography is proposed by adding the noise at Bob's side and the impact of finite-size effects focused on by performing the channel estimation. An optimal noise which can maximize the key rate is demonstrated to exist and, by using numeric simulations, is shown to vary with the transmission distance. Adding the optimal noise can enhance the effectiveness of the thermal states quantum cryptography protocol under noisy and lossy channel in terms of secret key rate, the maximum transmission distance and the tolerable channel noise. Although finite-size effects deteriorate the performance of thermal quantum cryptography, this approach can compensate the impact of this degradation, and even make the performance of the modified protocol in the finite-size regime better than that of the original protocol in the ideal asymptotic regime.

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Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

et al. 2018

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Quantum key distribution (QKD) using weak coherent states and homodyne detection is a promising candidate for practical quantum‐cryptographic implementations due to its compatibility with existing telecom equipment and high detection efficiencies. However, despite the actual simplicity of the protocol, the security analysis of this method is rather involved compared to discrete‐variable QKD. This article reviews the theoretical foundations of continuous‐variable quantum key distribution (CV‐QKD) with Gaussian modulation and rederives the essential relations from scratch in a pedagogical way. The aim of this paper is to be as comprehensive and self‐contained as possible in order to be well intelligible even for readers with little pre‐knowledge on the subject. Although the present article is a theoretical discussion of CV‐QKD, its focus lies on practical implementations, taking into account various kinds of hardware imperfections and suggesting practical methods to perform the security analysis subsequent to the key exchange. Apart from a review of well‐known results, this manuscript presents a set of new original noise models which are helpful to get an estimate of how well a given set of hardware will perform in practice.

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Long-distance continuous-variable quantum key distribution with efficient channel estimation

Cited by 84 publications

References 23 publications

Gaussian one-way thermal quantum cryptography with finite-size effects

Gaussian one-way thermal quantum cryptography with finite-size effects

Finite‐Size Analysis of Thermal States Quantum Cryptography with the Optimal Noise

Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations

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