Bosonic Diffusive Channel: Quantum Metrology via Finite Non-Gaussian Resource

• URL: http://arxiv.org/abs/2601.17804v1
• Date: Sun, 25 Jan 2026 11:46:28 GMT
• Title: Bosonic Diffusive Channel: Quantum Metrology via Finite Non-Gaussian Resource
• Authors: Arman, Prasanta K. Panigrahi,
• Abstract summary: We investigate the estimation of dephasing-variable decoherence in continuous-induced quantum systems using non-Gaussian probe states.<n>We identify optimal probes, specifically squeezed cat and symmetric squeezed compass states, via quantum Fisher information.
• Score: 1.8546972970551774
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the estimation of dephasing-induced decoherence in continuous-variable quantum systems using non-Gaussian probe states. By purifying the open system, we identify optimal probes, specifically squeezed cat and symmetric squeezed compass states, via quantum Fisher information. These results are in agreement with numerical simulation. In settings where the intra-cavity field is inaccessible and standard measurements are impractical, utilizing an ancilla approach where a qubit traverses or interacts with the cavity field, leading to measurement of the qubit, hence allowing estimation of the dephasing rate via Wigner function reconstruction or less costly marginal distribution.

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