Quantum Sensing using Geometrical Phase in Qubit-Oscillator Systems

Journal Article · Wed Nov 26 04:00:00 EST 2025 · No journal information

OSTI ID:3006302

Suri, Nishchay ^[1]; Wang, Zhihui ^[2]; Roy, Tanay ^[3]; Venturelli, Davide ^[2]; de Jong, Wibe Albert ^[1]

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1. LBNL, Berkeley
2. NASA, Ames; Google Inc.
3. Fermilab

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.

• Research Organization: NASA, Ames; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Google Inc.; LBNL, Berkeley
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: 89243024CSC000002
• OSTI ID: 3006302
• Report Number(s): FERMILAB-PUB-25-0862-SQMS; oai:inspirehep.net:3087602; arXiv:2511.21983
• Journal Information: No journal information, Journal Name: No journal information
• Country of Publication: United States
• Language: English