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Trapped Ion Quantum Computing

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

arXiv

Authors: Shruti Maliakal, Zachary Mann, Christopher Wipf, Rana X Adhikari, Su Direkci, Yanbei Chen

Year

2026

Paper ID

69351

Status

Preprint

Abstract Read

~2 min

Abstract Words

105

Citations

N/A

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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This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
It adds a 2026 reference point for readers tracking recent quantum research.
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...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2606.19649 [2] arXiv https://arxiv.org/abs/2606.19649 [3] Publisher https://arxiv.org/abs/2606.19649

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