Continuous-variable quantum key distribution under the local oscillator intensity attack with noiseless linear amplifier

Yang, Fangli; Shi, Ronghua; Guo, Ying; Shi, Jinjing; Zeng, Guihua

doi:10.1007/s11128-015-1020-2

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Thanks to the development of experimental techniques, on the other hand, some quantum operations have been used to improve the performance of CVQKD in terms of secret key rate and tolerable excess noise. For example, a heralded noiseless amplifier [26,27,35] was proposed to improve the maximal transmission distance roughly by the equivalent of 20log 10 g dB losses resulting from the compensation of the losses [27]. Recently, due to the fact that the non-Gaussian operation can be used for improving the entanglement [36][37][38] and quan-tum teleportation in CV system [39,40], the photonsubtraction operation, which is one of the non-Gaussian operations, has been proposed to improve the secret key rate, the maximal tolerable excess noise and the transmission distance of CVQKD protocol [11,14,15,29].…”

Section: Introductionmentioning

confidence: 99%

Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

et al. 2019

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The non-Gaussian operation can be used not only to enhance and distill the entanglement between Gaussian entangled states, but also to improve quantum communications. In this paper, we propose an non-Gaussian continuous-variable quantum key distribution (CVQKD) by using quantum catalysis (QC), which is an intriguing non-Gaussian operation in essence that can be implemented with current technologies. We perform quantum catalysis on both ends of the Einstein-Podolsky-Rosen (EPR) pair prepared by a sender, Alice, and find that for the single-photon QC-CVQKD, the bilateral symmetrical quantum catalysis (BSQC) performs better than the single-side quantum catalysis (SSQC). Attributing to characteristics of integral within an ordered product (IWOP) of operators, we find that the quantum catalysis operation can improve the entanglement property of Gaussian entangled states by enhancing the success probability of non-Gaussian operation, leading to the improvement of the QC-CVQKD system. As a comparison, the QC-CVQKD system involving zero-photon and single-photon quantum catalysis outperforms the previous non-Gaussian CVQKD scheme via photon subtraction in terms of secret key rate, maximal transmission distance and tolerable excess noise. arXiv:1811.06698v3 [quant-ph]

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Section: Introductionmentioning

confidence: 99%

Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

et al. 2019

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“…The improvement of the performance of Gaussian CV-QKD systems using an ideal NLA has been discussed for different protocols and in different scenarios [36][37][38]. However, in all of these works the success probability has been considered based on the theoretical predictions (which is much higher than the actual experimental success probability).…”

Section: Post-selectionmentioning

confidence: 99%

Finite-size effects in continuous-variable QKD with Gaussian post-selection

Hosseinidehaj,

Lance,

Symul

et al. 2019

Preprint

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In a continuous-variable quantum key distribution (CV-QKD) protocol, which is based on heterodyne detection at the receiver, the application of a noiseless linear amplifier (NLA) on the received signal before the detection can be emulated by the post-selection of the detection outcome. Such a post-selection, which is also called a measurement-based NLA, requires a cut-off to produce a normalisable filter function. Increasing the cut-off with respect to the received signals results in a more faithful emulation of the NLA and nearly Gaussian output statistics at the cost of discarding more data. While recent works have shown the benefits of post-selection via an asymptotic security analysis, we undertake the first investigation of such a post-selection utilising a composable security proof in the realistic finite-size regime, where this trade-off is extremely relevant. We show that this form of post-selection can improve the secure range of a CV-QKD over lossy thermal channels if the finite block size is sufficiently large and that the optimal value for the filter cut-off is typically in the non-Gaussian regime. The relatively modest improvement in the finite-size regime as compared to the asymptotic case highlights the need for new tools to prove the security of non-Gaussian cryptographic protocols. These results also represent a quantitative assessment of a measurement-based NLA with an entangled-state input in both the Gaussian and non-Gaussian regime.

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“…Recently, some works have shown that a noiseless linear amplifier (NLA) [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ] could be properly embedded in CV-QKD to fight against channel loss and improve maximum transmission distance [ 37 , 38 , 39 , 40 , 41 ]. In our paper, we consider the use of an NLA inserted before the detection stage in an SR CV-QKD scheme to improve the transmission distance when the reference pulses are weak.…”

Section: Introductionmentioning

confidence: 99%

Improving the Maximum Transmission Distance of Self-Referenced Continuous-Variable Quantum Key Distribution Using a Noiseless Linear Amplifier

Wang

Huang

et al. 2018

Entropy

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We show that a noiseless linear amplifier (NLA) can be placed properly at the receiver's end to improve the performance of self-referenced (SR) continuous variable quantum key distribution (CV-QKD) when the reference pulses are weak. In SR CV-QKD, the imperfections of the amplitude modulator limit the maximal amplitude of the reference pulses, while the performance of SR CV-QKD is positively related to the amplitude of the reference pulses. An NLA can compensate the impacts of large phase noise introduced by the weak reference pulses. Simulation results derived from collective attacks show that this scheme can improve the performance of SR CV-QKD with weak reference pulses, in terms of extending maximum transmission distance. An NLA with a gain of g can increase the maximum transmission distance by the equivalent of 20 log 10 g dB of losses.

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Continuous-variable quantum key distribution under the local oscillator intensity attack with noiseless linear amplifier

Cited by 7 publications

References 32 publications

Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

Finite-size effects in continuous-variable QKD with Gaussian post-selection

Improving the Maximum Transmission Distance of Self-Referenced Continuous-Variable Quantum Key Distribution Using a Noiseless Linear Amplifier

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