Spectral Analysis of Quantum Field Fluctuations in a Strongly Coupled Optomechanical System

With a levitodynamics experiment in the strong and coherent quantum optomechanical coupling regime, we demonstrate that the oscillator acts as a broadband quantum spectrum analyzer. The asymmetry between positive and negative frequency branches in the displacement spectrum traces out the spectral fe...

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Published in:Physical review letters 2023-05, Vol.130 (19), p.193601-193601, Article 193601
Main Authors: Ranfagni, A, Marino, F, Marin, F
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Marin, F
description With a levitodynamics experiment in the strong and coherent quantum optomechanical coupling regime, we demonstrate that the oscillator acts as a broadband quantum spectrum analyzer. The asymmetry between positive and negative frequency branches in the displacement spectrum traces out the spectral features of the quantum fluctuations in the cavity field, which are thus explored over a wide spectral range. Moreover, in our two-dimensional mechanical system the quantum backaction, generated by such vacuum fluctuations, is strongly suppressed in a narrow spectral region due to a destructive interference in the overall susceptibility.
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title Spectral Analysis of Quantum Field Fluctuations in a Strongly Coupled Optomechanical System
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