Abstract
An improved continuous variable quantum key distribution (CVQKD) approach based on a heralded hybrid linear amplifier (HLA) is proposed in this study, which includes an ideal deterministic linear amplifier and a probabilistic noiseless linear amplifier. The CVQKD, which is based on an amplifier, enhances the signal-to-noise ratio and provides for fine control between high gain and strong noise reduction. We focus on the impact of two types of optical amplifiers on system performance: phase sensitive amplifiers (PSA) and phase insensitive amplifiers (PIA). The results indicate that employing amplifiers, local local oscillation-based CVQKD systems can enhance key rates and communication distances. In addition, the PIA-based CVQKD system has a broader application than the PSA-based system.
Highlights
Quantum key distribution (QKD) provides a secret key sharing method guaranteed by quantum mechanics for trusted communication parties, namely Alice and Bob, in the presence of potential eavesdroppers [1,2,3]
We propose a continuous variable quantum key distribution (CVQKD) scheme based on local oscillation (LLO) in this paper by placing an hybrid linear amplifier (HLA) at the detection end, which consists of a predictive measurement (MB)-based noiseless linear amplifier (NLA) and an optimal deterministic linear amplifier (DLA) that can amplify the amplitude of the coherent state while maintaining low noise and a high success rate
We offer a practical LLO-CVQKD system based on an HLA, which consists of an MB-NLA and a DLA, with the latter compensating for the former’s signal-tonoise ratio degradation
Summary
Quantum key distribution (QKD) provides a secret key sharing method guaranteed by quantum mechanics for trusted communication parties, namely Alice and Bob, in the presence of potential eavesdroppers [1,2,3]. In Bob’s quadrature measurement, the defects associated with practical detectors cause a secret key rate constraint [36] To compensate for this weakness, optical amplifier compensation technology offers a viable solution that can improve transmission distance in specific situations [37,38,39]. We propose a CVQKD scheme based on LLO in this paper by placing an HLA at the detection end, which consists of a predictive measurement (MB)-based NLA and an optimal deterministic linear amplifier (DLA) that can amplify the amplitude of the coherent state while maintaining low noise and a high success rate.
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