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.

Original languageEnglish
Article number024007
Pages (from-to)1-9
Number of pages9
JournalQuantum Science and Technology
Issue number2
Publication statusPublished - 2019

    Research areas

  • micro-oscillators, Optomechanics, quantum thermometry

ID: 56122170