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, Lgo Enrico Fermi 6, I-50125 Florence, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; European Lab Nonlinear Spect LENS, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; Inst Mat Elect & Magnetism, Nanosci Trento FBK Div, I-38123 Povo, Trento, Italy; Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Povo, Trento, Italy; Delft Univ Technol, Dept Microelect & Comp Engn ECTM EKL, Feldmanweg 17, NL-2628 CT Delft, Netherlands; UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England; Univ Trento, Dipartimento Fis, I-38123 Povo, Trento, Italy; Univ Firenze, Dipartimento Fis & Astron, 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.

Journal/Review: QUANTUM SCIENCE AND TECHNOLOGY

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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