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    Optomechanical entanglement at room temperature: A simulation study with realistic conditions

    Kahlil Y. Dixon1, Lior Cohen1, Narayan Bhusal1, Christopher Wipf2, Jonathan P. Dowling1,3,4,5, and Thomas Corbitt1

    • 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
    • 2LIGO Laboratory, California Institute of Technology, Pasadena, California 91125, USA
    • 3NYU-ECNU Institute of Physics at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China
    • 4CAS-Alibaba Quantum Computing Laboratory, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
    • 5National Institute of Information and Communications Technology, 4-2-1, Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan

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    Phys. Rev. A 102, 063518 – Published 14 December, 2020

    DOI: https://doi.org/10.1103/PhysRevA.102.063518

    Abstract

    Quantum entanglement is the key to many applications like quantum key distribution, quantum teleportation, and quantum sensing. However, reliably generating quantum entanglement in macroscopic systems has proven to be a challenge. Here, we present a detailed analysis of ponderomotive entanglement generation in a movable-end-mirror-type optomechanical cavity. These cavities utilize optomechanical interactions between the intracavity field and the end mirror to create quantum correlations. We numerically calculate an entanglement measure, the logarithmic negativity, for the quantitative assessment of the entanglement. Experimental limitations, including thermal noise and optical loss, from measurements of an existing experiment were included in the calculation, which is intractable to solve analytically. This analysis shows that lowering optical losses and measurement uncertainties is more important than temperature for observation of the entanglement in movable-end-mirror-type optomechanical cavity experiments. This work will play an important role in the development of ponderomotive entanglement devices.

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    Phys. Rev. A 102, 063518– Published 14 December, 2020
    • Received 9 July 2020
    • Revised 13 October 2020
    • Accepted 25 November 2020
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