Inverse-squeezing receivers for squeezed-state pulse-position modulation under ideal and phase-diffusion conditions

• URL: http://arxiv.org/abs/2606.31541v1
• Date: Tue, 30 Jun 2026 11:53:30 GMT
• Title: Inverse-squeezing receivers for squeezed-state pulse-position modulation under ideal and phase-diffusion conditions
• Abstract summary: We propose an inverse-squeezing conditional pulse-nulling (IS-CPN) receiver.<n>We show that IS-CPN outperforms conventional CPN under the same energy constraint.<n>These results demonstrate that combining squeezed-state modulation with inverse-squeezing conditional nulling can improve photon-efficient optical communication.
• Score: 18.95693454021274
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce a squeezed-state pulse-position modulation (S-PPM) format, where the empty slots are squeezed vacuum states and the pulse slot is a displaced squeezed state. Based on this property, we propose an inverse-squeezing conditional pulse-nulling (IS-CPN) receiver. In the ideal case, inverse squeezing maps S-PPM into an equivalent coherent-state PPM signal with a large pulse energy, leading to a closed-form expression for the receiver error probability. We further analyze IS-CPN under common phase diffusion using a finite-path MAP formulation with phase-averaged likelihoods. Numerical results show that IS-CPN outperforms conventional CPN under the same energy constraint and remains advantageous under phase noise and finite photon-number resolution. These results demonstrate that combining squeezed-state modulation with inverse-squeezing conditional nulling can improve photon-efficient optical communication.

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