Optimized Quantum States for Sensing in the Presence of Loss and Phase Noise

• URL: http://arxiv.org/abs/2606.19649v1
• Date: Wed, 17 Jun 2026 23:06:38 GMT
• Title: Optimized Quantum States for Sensing in the Presence of Loss and Phase Noise
• Abstract summary: We numerically optimize the quantum Fisher information across the loss and phase-noise landscape.<n>We identify non-Gaussian states that outperform any Gaussian state.<n>We observe that the non-Gaussian advantage can persist even when the measurement strategy is homodyne detection.
• Score: 6.786657571173149
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Squeezed vacuum lets gravitational-wave detectors and other quantum sensors surpass the standard quantum limit, and is optimal in the loss-limited regime; phase noise breaks this optimality. Numerically optimizing the quantum Fisher information across the loss and phase-noise landscape, we identify non-Gaussian states that outperform any Gaussian state. These fall into three classes: Fock-like, cubic-phase-like, and states with discrete rotational symmetry. Limiting the average number of photons in the input state to $\bar{n}=5$, with $1-η= 5\%$ photon loss and 200 mrad phase noise, the non-Gaussian advantage reaches up to 2.2 dB. Furthermore, we observe that the non-Gaussian advantage can persist even when the measurement strategy is homodyne detection.

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