Quantum Sensing using Geometrical Phase in Qubit-Oscillator Systems

• URL: http://arxiv.org/abs/2511.21983v1
• Date: Wed, 26 Nov 2025 23:48:08 GMT
• Title: Quantum Sensing using Geometrical Phase in Qubit-Oscillator Systems
• Authors: Nishchay Suri, Zhihui Wang, Tanay Roy, Davide Venturelli, Wibe Albert de Jong,
• Abstract summary: We present a quantum sensing protocol for coupled qubit-oscillator systems.<n>It surpasses the standard quantum limit by exploiting a geometrical phase.<n>The protocol shows to qubit Markovian noise and preserves its state-independence.
• Score: 5.30130021285897
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a quantum sensing protocol for coupled qubit-oscillator systems that surpasses the standard quantum limit (SQL) by exploiting a geometrical phase. The signal is encoded in the geometrical phase that is proportional to the area enclosed in oscillator phase space. This area is amplified through squeezing, enabling sensitivities beyond the SQL. Our method is independent of oscillator's initial state, amenable to sensing with high-temperature or logical error-corrected states. The protocol shows robustness to qubit Markovian noise and preserves its state-independence, underscoring its practicality for next-generation quantum metrology. We demonstrate application to force sensing beyond the SQL in longitudinally coupled systems, and to high-precision measurements of couplings and pulse calibration surpassing SQL in dispersively coupled circuit quantum electrodynamics (cQED) architectures.

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