Performance improvement of unidimensional continuous-variable quantum key distribution using heralded hybrid linear amplifier

Zhou, Kunlin; Chen, Zhiya; Guo, Ying; Liao, Qin

doi:10.1016/j.physleta.2019.126074

Cited by 2 publications

(2 citation statements)

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“…According to [39], the influence of the deterministic amplifier introduced in front of the detector on the calculation of the secret key rate can be concentrated on the noise c h DLA introduced by the detector, and it can be expressed as…”

Section: Calculation Of the Secret Key Ratementioning

confidence: 99%

“…On this basis, a heralded hybrid linear amplifier (HLA) [30,31], which consists of a deterministic linear amplifier (DLA) [32][33][34] and a measurement-based noiseless linear amplifier (MB-NLA) [35][36][37][38], is introduced to the receiver for improving the system performance of a four-state CV-QKD protocol. This combinatorial amplifier allows one flexible to tune the performance between high gain and high noise reduction, and control the trade-off between the amplification coefficient and a finite heralding probability flexibly [39]. Simulation results show that adding a hybrid amplifier can effectively improve the secret key rate and the maximum secure transmission distance of the underwater four-state CV-QKD protocol.…”

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confidence: 99%

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Improving the discretely modulated underwater continuous-variable quantum key distribution with heralded hybrid linear amplifier

et al. 2021

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The current investigation on continuous-variable quantum key distribution (CV-QKD) is mainly based on the optical fibre or the free space atmosphere channel, while the ocean, which covers most of the Earth, has not been well utilized. In this paper, we analyze the influence of depth and wavelength on the attenuation effect of seawater on light by using a model based on the concentration of chlorophyll-a, and propose an improved four-state underwater CV-QKD protocol with a heralded hybrid linear amplifier (HLA). Both homodyne detection with a phase-sensitive amplifier and heterodyne detection with a phase-insensitive amplifier are considered. Simulation results show that the introduction of the heralded HLA can effectively extend the secure transmission distance of the key. Besides, when the transmission distance is relatively long, the secret key rate of the protocol is higher than that of the protocol without HLA.

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Section: Calculation Of the Secret Key Ratementioning

confidence: 99%