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The practical homodyne detector model of continuous-variable quantum keydistribution models the inherent imperfections of the practical homodynedetector, namely the limited detection efficiency and the electronic noise,into trusted loss. However, the conventional practical homodyne detector modelis valid only when both the imperfections of the practical homodyne detectorare calibrated. In this paper, we show a modified practical homodyne detectormodel that can model the imperfections separately. The phase-sensitiveamplifier is further applied to compensate the imperfections of the practicalhomodyne detector. The feasibility of the modified practical homodyne detectormodel with the phase-sensitive amplifier is proved and the security analysis isprovided in detail. Simulation results reveal that the phase-sensitiveamplifier can be used to improve the performance of the modified practicalhomodyne detector model, and when the gain is infinitely high, the limiteddetection efficiency can be fully compensated.

journal of physics. b, atomic molecular and optical physics/journal of physics. b, atomic, molecular and optical physics

A modified practical homodyne detector model for continuous-variable  quantum key distribution: detailed security analysis and improvement by the  phase-sensitive amplifier