Quantum Rabi interferometry of motion and radiation
- URL: http://arxiv.org/abs/2204.07699v3
- Date: Wed, 24 May 2023 08:55:45 GMT
- Title: Quantum Rabi interferometry of motion and radiation
- Authors: Kimin Park, Petr Marek, Ulrik L. Andersen, and Radim Filip
- Abstract summary: We propose a hybrid oscillator-qubit interferometric setup for the estimation of phase space displacements in an arbitrary direction.
Using such a hybrid Rabi interferometer for quantum sensing, we show that the performance is superior to the ones attained by single-mode estimation schemes.
- Score: 1.0499611180329804
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The precise determination of a displacement of a mechanical oscillator or a
microwave field in a predetermined direction in phase space can be carried out
with trapped ions or superconducting circuits, respectively, by coupling the
oscillator with ancilla qubits. Through that coupling, the displacement
information is transferred to the qubits which are then subsequently read out.
However, unambiguous estimation of displacement in an unknown direction in the
phase space has not been attempted in such oscillator-qubit systems. Here, we
propose a hybrid oscillator-qubit interferometric setup for the unambiguous
estimation of phase space displacements in an arbitrary direction, based on
feasible Rabi interactions beyond the rotating-wave approximation. Using such a
hybrid Rabi interferometer for quantum sensing, we show that the performance is
superior to the ones attained by single-mode estimation schemes and a
conventional interferometer based on Jaynes-Cummings interactions. Moreover, we
find that the sensitivity of the Rabi interferometer is independent of the
thermal occupation of the oscillator mode, and thus cooling it to the ground
state before sensing is not required. We also perform a thorough investigation
of the effect of qubit dephasing and oscillator thermalization. We find the
interferometer to be fairly robust, outperforming different benchmark
estimation schemes even for large dephasing and thermalization.
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