Calibrated quantum thermometry in cavity optomechanics

Year: 2019

Authors: Chowdhury A., Vezio P., Bonaldi M., Borrielli A., Marino F., Morana B., Pandraud G., Pontin A., Prodi G. A., Sarro P. M., Serra E., Marin F.

Autors Affiliation: CNR-INO, L.go Enrico Fermi 6, I-50125 Firenze, Italy; Istituto Nazionale di Fisica Nucleare (INFN), Sezione 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; Institute of Materials for Electronics and Magnetism, Nanoscience-Trento-FBK Division, I-38123 Povo, Trento, Italy; Istituto Nazionale di Fisica Nucleare (INFN), Trento Institute for Fundamental Physics and Application, I-38123 Povo, Trento, Italy; Dept. of Microelectronics and Computer Engineering/ECTM-EKL, Delft University of Technology, Feldmanweg 17, 2628 CTDelft, The Netherlands; Department of Physics and Astronomy, University College London, Gower Street, London WC1E6BT, United Kingdom; Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy; Dipartimento di Fisica e Astronomia, Università di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.

Abstract: Cavity optomechanics has achieved the major breakthrough of the preparation and observation of macroscopic mechanical oscillators in non-classical states. The development of reliable indicators of the oscillator properties in these conditions is important also for applications to quantum
technologies. We compare two procedures to infer the oscillator occupation number, minimizing the necessity of system calibrations. The former starts from homodyne spectra, the latter is based on the measurement of the motional sideband asymmetry in heterodyne spectra. Moreover, we describe and discuss a method to control the cavity detuning, that is a crucial parameter for the accuracy of the latter, intrinsically superior procedure.


Volume: 4 (2)      Pages from: 024007-1  to: 024007-9

More Information: Research performed within the Project QuaSeRT funded by the QuantERA ERA-NET Cofund in Quantum Technologies implemented within the European Unions Horizon 2020 Programme. The research has been partially supported by INFN (HUMOR project). AP has received funding from the European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 749709.
KeyWords: Cavity optomechanics, quantum thermometry
DOI: 10.1088/2058-9565/ab05f1

Citations: 9
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