Boosting State Discrimination in Quantum Brownian Motion Channel via Memory-Induced Coherence Preservation

• URL: http://arxiv.org/abs/2607.15405v1
• Date: Thu, 16 Jul 2026 19:15:04 GMT
• Title: Boosting State Discrimination in Quantum Brownian Motion Channel via Memory-Induced Coherence Preservation
• Abstract summary: We show that continuous-variable state discrimination can be improved by increasing, rather than minimizing, the initial thermal noise.<n>We also show that quadrature homodyne detection achieves near-optimal performance, approaching the Helstrom limit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Preserving quantum resources in dissipative environments is a fundamental challenge in quantum information processing. While environmental interactions usually degrade quantum resources, we theoretically show that in a Quantum Brownian Motion (QBM) channel, continuous-variable state discrimination can be improved by increasing, rather than minimizing, the initial thermal noise. Specifically, without suppressing the inherent environmental dissipation, when combined with squeezing, this initial noise induces a coherence preservation mechanism driven by the transient non-thermalization of the probe with the bath. This preservation translates into a pronounced reduction in error probabilities for state discrimination between orthogonal squeezing directions. Furthermore, we also show that quadrature homodyne detection achieves near-optimal performance, approaching the Helstrom limit. These results highlight the advantage of exploiting thermal-squeezed states, offering a robust physical architecture for quantum communication in high-temperature environments.

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