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arXiv · 2209.14760

Millionfold improvement in multivibration-feedback optomechanical refrigeration via auxiliary mechanical coupling

Rui Xu·Deng-Gao Lai·Bang-Pin Hou·Adam Miranowicz·Franco Nori
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Abstract

The simultaneous ground-state refrigeration of multiple vibrational modes is a prerequisite for observing significant quantum effects of multiple-vibration systems. Here we propose how to realize a large amplification in the net-refrigeration rates based on cavity optomechanics and to largely improve the cooling performance of multivibration modes beyond the resolved-sideband regime. By employing an auxiliary mechanical coupling (AMC) between two mechanical vibrations, the dark mode, which is induced by the coupling of these vibrational modes to a common optical mode and cuts off cooling channels, can be fully removed. We use fully analytical treatments for the effective mechanical susceptibilities and net-cooling rates and find that when the AMC is turned on, the amplification of the net-refrigeration rates by more than six orders of magnitude can be observed. In particular, we reveal that the simultaneous ground-state cooling beyond the resolved-sideband regime arises from the introduced AMC, without which it vanishes. Our work paves the way for quantum control of multiple vibrational modes in the bad-cavity regime.

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Rui Xu, Deng-Gao Lai, Bang-Pin Hou, Adam Miranowicz, Franco Nori. 2022-09-29. Millionfold improvement in multivibration-feedback optomechanical refrigeration via auxiliary mechanical coupling. https://doi.org/10.1103/physreva.106.033509

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