Variational quantum state preparation for quantum-enhanced metrology in noisy systems

Zuñiga Castro, Juan C.; Larson, Jeffrey; Narayanan, Sri Hari Krishna; Colussi, Victor E.; Perlin, Michael A.; Lewis-Swan, Robert J.

doi:10.1103/PhysRevA.110.052615

Variational quantum state preparation for quantum-enhanced metrology in noisy systems

Journal Article · Wed Nov 20 23:00:00 EST 2024 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.110.052615· OSTI ID:2589336

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Univ. of Oklahoma, Norman, OK (United States)
Argonne National Lab., Idaho Falls, ID (United States)
ColdquantaLabs, Infleqtion, Inc., Boulder, CO (United States)
JPMorgan Chase, New York, NY (United States); Infleqtion, Inc., Chicago, IL (United States)

Here, we investigate optimized quantum state preparation for quantum metrology applications in noisy environments. Using the QFI-OPT package, we simulate a low-depth variational quantum circuit (VQC) composed of a sequence of global rotations and entangling operations applied to a chain of qubits that are subject to dephasing noise. The parameters controlling the VQC are numerically optimized to maximize the quantum Fisher information, which characterizes the ultimate metrological sensitivity of a quantum state with respect to a global rotation. We find that, regardless of the details of the entangling operation implemented in the VQC, the optimal quantum states can be broadly classified into a trio of qualitative regimes, i.e., catlike, squeezed like, and product states, associated with different dephasing rates. Our findings are relevant for designing optimal state-preparation strategies for next-generation quantum sensors exploiting entanglement, such as time and frequency standards and magnetometers, aimed at achieving state-of-the-art performance in the presence of noise and decoherence.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2589336

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 110; ISSN 2469-9934; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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