Calibrated quantum thermometry in cavity optomechanics
A. Chowdhury (Sezione di Firenze, Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche)
P. Vezio (Sezione di Firenze, European Laboratory for Non-linear Spectroscopy (LENS))
M. Bonaldi (Trento Institute for Fundamental Physics and Applications, Fondazione Bruno Kessler)
A. Borrielli (Fondazione Bruno Kessler, Trento Institute for Fundamental Physics and Applications)
F. Marino (Sezione di Firenze, Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche)
B. Morana (TU Delft - Electrical Engineering, Mathematics and Computer Science, Fondazione Bruno Kessler)
G. Pandraud (TU Delft - Electrical Engineering, Mathematics and Computer Science)
P. M. Sarro (TU Delft - Electrical Engineering, Mathematics and Computer Science)
E. Serra (Trento Institute for Fundamental Physics and Applications, TU Delft - Electrical Engineering, Mathematics and Computer Science)
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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.