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Discrete-modulated continuous-variable quantum key distribution with homodyne detection is widely known for the simplicity on implementation, the efficiency in error correction and the compatibility with modern optical communication devices. However, recent work indicates that using homodyne detection will lead to poor tolerance of excess noise and insufficient transmission distance, hence seriously restricting the large-scale deployment of quantum secure communication networks. Here, we propose a homodyne detection protocol using the technique of quadrature phase shift keying. By limiting information leakage, our protocol enhances excess noise tolerance to a high level. Furthermore, we demonstrate that using homodyne detection performs better than heterodyne detection in quaternary-modulated continuous-variable quantum key distribution under the untrusted detector noise scenario. The security is analyzed by tight numerical method against collective attacks in the asymptotic regime. Results imply that our protocol possesses the ability to distribute keys in nearly intercity area. This progress will make our protocol the main force in constructing low-cost quantum secure communication networks.
Most quantum key distribution (QKD) protocols could be classified as either a discrete-variable (DV) protocol or continuous-variable (CV) protocol, based on how classical information is being encoded. We propose a protocol that combines the best of b
The value of residual phase noise, after phase compensation, is one of the key limitations of performance improvement for continuous-variable quantum key distribution using a local local oscillator (LLO CV-QKD) system, since it is the major excess no
Information reconciliation is crucial for continuous-variable quantum key distribution (CV-QKD) because its performance affects the secret key rate and maximal secure transmission distance. Fixed-rate error correction codes limit the potential applic
We analyze the effect of phase fluctuations in an optical communication scheme based on collective detection of sequences of binary coherent state symbols using linear optics and photon counting. When the phase noise is absent, the scheme offers qual
The shot-noise unit in continuous-variable quantum key distribution plays an important and fundamental role in experimental implementation as it is used as a normalization parameter that contribute to perform security analysis and distill the key inf