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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Single- and Multi-Phonon Subtraction to a Mechanical Thermal State via Optomechanics

Andreas Ø. Svela, Georg Enzian, Lars Freisem, J. J. Price, J. Clarke, Biveen Shajilal, Jiří Janoušek, B. C. Buchler, Ping Koy Lam, Michael Ross Vanner

Published Jul 31, 2022• 0 citations
Publisher

Abstract

By heralding events of single- and multi-phonon subtraction to a mechanical thermal state in a Brillouin optomechanical system and using heterodyne tomography, we observe non-Gaussianity in the s-parameterised Wigner phase-space distribution.
DOI
10.1109/cleo-pr62338.2022.10432611

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A room-temperature mechanical oscillator undergoes thermal Brownian motion with an amplitude much larger than the amplitude associated with a single phonon of excitation. This motion can be read out and manipulated using laser light using a cavity-optomechanical approach. By performing a strong quantum measurement (i.e., counting single photons in the sidebands imparted on a laser), we herald the addition and subtraction of single phonons on the 300 K thermal motional state of a 4 GHz mechanical oscillator. To understand the resulting mechanical state, we implement a tomography scheme and observe highly non-Gaussian phase-space distributions. Using a maximum likelihood method, we infer the density matrix of the oscillator, and we confirm the counterintuitive doubling of the mean phonon number resulting from phonon addition and subtraction.
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