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

Year: 2023

Authors: Ranfagni A., Marino F., Marin F.

Autors Affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
European Laboratory for Non-Linear Spectroscopy (LENS), via Carrara 1, I-50019 Sesto Fiorentino (FI), Italy.
INFN, Sezione di Firenze, via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
CNR-INO, largo Enrico Fermi 6, I-50125 Firenze, Italy.

Abstract: 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.


Volume: 130      Pages from: 193601-1  to: 193601-6

KeyWords: Quantum optomechanics; Levitated nanoparticles.
DOI: https://doi.org/10.1103/PhysRevLett.130.193601