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Enhancement of charge sensitivity by nonlinear optomechanics

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Abstract

Quantum estimation of electrical charge is investigated by using nonlinear optomechanical interaction. Due to the light–matter decoupling at one mechanical period, we need to consider only the cavity state, meaning that no direct access to the oscillator state is required. It is shown that the charge sensitivity can be greatly improved by enhancing optomechanical coupling. Further, we find that our theoretical result can surpass the sensitivity obtained from electrical measurements.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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