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

Year: 2023

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

Autors Affiliation: Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; European Lab Nonlinear Spect LENS, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; INFN, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; CNR INO, Largo Enr Fermi 6, I-50125 Florence, 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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 130 (19)      Pages from: 193601-1  to: 193601-6

More Information: We acknowledge financial support from: PNRR MUR Project No. PE0000023-NQSTI.
KeyWords: Quantum optomechanics; Levitated nanoparticles.
DOI: 10.1103/PhysRevLett.130.193601

Citations: 1
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