Witnessing Opto-Mechanical Entanglement with Photon-Counting

Abstract

The ability to coherently control mechanical systems with optical fields has made great strides over the past decade, and now includes the use of photon counting techniques to detect the non-classical nature of mechanical states. These techniques may soon be used to perform an opto-mechanical Bell test, hence highlighting the potential of cavity opto-mechanics for device-independent quantum information processing. Here, we propose a witness which reveals opto-mechanical entanglement without any constraint on the global detection efficiencies in a setup allowing one to test a Bell inequality. While our witness relies on a well-defined description and correct experimental calibration of the measurements, it does not need a detailed knowledge of the functioning of the opto-mechanical system. A feasibility study including dominant sources of noise and loss shows that it can readily be used to reveal opto-mechanical entanglement in present-day experiments with photonic crystal nanobeam resonators.

arXiv comment5+7 pages, 4 figures

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• Phase-selective tripartite entanglement and asymmetric Einstein-Podolsky-Rosen steering in squeezed optomechanics
• Universality of stationary entanglement in an optomechanical system driven by non-Markovian noise and squeezed light
• Characterizing stationary optomechanical entanglement in the presence of non-Markovian noise
• Kerr-enhanced optomechanical entanglement generation via reservoir design
• Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems