Multimode quantum optomechanics with ultra-coherent nanomechanical resonators
We demonstrate an optomechanical system with quantum cooperativity C q = 4g 2 /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, y = k B T/ħQ is the quantum decoherence rate of the mec...
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Published in | 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) p. 1 |
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Main Authors | , , , , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.06.2017
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Subjects | |
Online Access | Get full text |
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Summary: | We demonstrate an optomechanical system with quantum cooperativity C q = 4g 2 /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, y = k B T/ħQ is the quantum decoherence rate of the mechanical system due to its thermal bath at temperature T~4 K, and Q~10 7 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]. |
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DOI: | 10.1109/CLEOE-EQEC.2017.8087387 |