Evaluating the performance of a weak-field homodyne receiver in quadrature phase-shift keying optical communication

• URL: http://arxiv.org/abs/2604.08241v1
• Date: Thu, 09 Apr 2026 13:32:51 GMT
• Title: Evaluating the performance of a weak-field homodyne receiver in quadrature phase-shift keying optical communication
• Abstract summary: Quantum communication protocols require efficient detection schemes to maximize the information transfer rate between the sender and the receiver.<n>We have demonstrated that weak-field receivers, merging wave-like and particle-like features, can be considered as a valid alternative to already existing receivers.
• Score: 0.8209843760716958
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum communication protocols require efficient detection schemes to maximize the information transfer rate between the sender and the receiver. To this aim, we have demonstrated that weak-field receivers, merging wave-like and particle-like features, can be considered as a valid alternative to already existing receivers, such as optical homodyne detection. To better emphasize the potential of our receiver, in this work we consider a proof of concept for quaternary communication based on coherent states with the same amplitude and different phase values. The encoding in phase requires a fine control of phase noise obtained through a feedback system. The results achieved in terms of mutual information and secret key generation rate encourage further increase of the alphabet towards an approximately continuous phase modulation.

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