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Cavity optomechanics assisted by optical coherent feedback

Harwood, A; Brunelli, M; Serafini, A; (2021) Cavity optomechanics assisted by optical coherent feedback. Physical Review A , 103 (2) , Article 023509. 10.1103/PhysRevA.103.023509. Green open access

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Abstract

We consider a wide family of optical coherent feedback loops acting on an optomechanical system operating in the linearized regime. We assess the efficacy of such loops in improving key operations, such as cooling, steady-state squeezing and entanglement, as well as optical-to-mechanical state transfer.We find that mechanical sideband cooling can be enhanced through passive, interferometric coherent feedback, achieving lower steadystate occupancies and considerably speeding up the cooling process; we also quantify the detrimental effect of nonzero delay times on the cooling performance. Steady-state entanglement generation in the blue sideband can also be assisted by passive interferometric feedback, which allows one to stabilize otherwise unstable systems, though active feedback (including squeezing elements) does not help to this aim. We show that active feedback loops only allow for the generation of optical, but not mechanical, squeezing. Finally, we prove that passive feedback can assist state transfer at transient times for red-sideband-driven systems in the strong-coupling regime.

Type: Article
Title: Cavity optomechanics assisted by optical coherent feedback
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.103.023509
Publisher version: http://doi.org/10.1103/PhysRevA.103.023509
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Optics, Physics, Atomic, Molecular & Chemical, Physics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10128220
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