Abstract
We demonstrate an optomechanical system with quantum cooperativity Cq = 4g2/κγ » 1 already at moderate cryogenic temperature [1]. It is realised as a membrane-in-the-middle system [2] with a high-stress silicon nitride membrane. Here, γ = kBT/ħQ is the quantum decoherence rate of the mechanical system due to its thermal bath at temperature T~4 K, and Q~107 the mechanical quality factor. In this regime, the quantum backaction of the optical measurement dominates over the thermal Langevin noise. As a consequence, optical measurements create quantum correlations between the optical and mechanical degrees of freedom, which are eventually measured as sub-vacuum noise (−2.4 dB) of the light emerging form the cavity (ponderomotive squeezing [3]). We investigate this effect in a multimode setting, in which we observe optically-induced hybridisation of mechanical modes, and the generation of squeezed light by hybrid modes [1].
© 2017 IEEE
PDF ArticleMore Like This
Yeghishe Tsaturyan, William H. P. Nielsen, Christoffer Møller, Andreas Barg, Junxin Chen, Yannick Seis, Eugene Polzik, and Albert Schliesser
FW4F.5 CLEO: QELS_Fundamental Science (CLEO:FS) 2017
Junxin Chen, Massimiliano Rossi, David Mason, Yeghishe Tsaturyan, Yannick Seis, and Albert Schliesser
ATh3H.5 CLEO: Applications and Technology (CLEO:A&T) 2018
Sampo A. Saarinen, Nenad Kralj, Yeghishe Tsaturyan, Eric Langman, and Albert Schliesser
FTh2P.3 CLEO: QELS_Fundamental Science (CLEO:FS) 2021