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This theoretical study demonstrates a counterintuitive advantage in quantum communication where increasing initial thermal noise can enhance state discrimination within Quantum Brownian Motion channels. By leveraging memory-induced coherence preservation alongside squeezing, the research identifies robust architectures capable of maintaining performance even in high-temperature environments without requiring active dissipation suppression. These findings offer significant implications for designing resilient continuous-variable quantum networks that operate effectively under realistic environmental conditions.
Boosting State Discrimination in Quantum Brownian Motion Channel via Memory-Induced Coherence Preservation
arXiv:2607.15405v1 Announce Type: new 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.
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.
arXiv:2607.15405 [quant-ph]
(or arXiv:2607.15405v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2607.15405 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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