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Generating mechanical and optomechanical entanglement via pulsed interaction and measurement
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stevens Institute of Technology, USA.
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Number of Authors: 62020 (English)In: New Journal of Physics, E-ISSN 1367-2630, Vol. 22, no 6, article id 063001Article in journal (Refereed) Published
Abstract [en]

Entanglement generation at a macroscopic scale offers an exciting avenue to develop new quantum technologies and study fundamental physics on a tabletop. Cavity quantum optomechanics provides an ideal platform to generate and exploit such phenomena owing to the precision of quantum optics combined with recent experimental advances in optomechanical devices. In this work, we propose schemes operating outside the resolved-sideband regime, to prepare and verify both optical-mechanical and mechanical-mechanical entanglement. Our schemes employ pulsed interactions with a duration much less than the mechanical period and, together with homodyne measurements, can both generate and characterize these types of entanglement. To improve the performance of our schemes, a precooling stage comprising prior pulses can be utilized to increase the amount of entanglement prepared, and local optical squeezers may be used to provide resilience against open-system dynamics. The entanglement generated by our schemes is quantified using the logarithmic negativity and is analysed with respect to the strength of the pulsed optomechanical interactions for realistic experimental scenarios including mechanical decoherence and optical loss. Two separate schemes for mechanical entanglement generation are introduced and compared: one scheme based on an optical interferometric design, and the other comprising sequential optomechanical interactions. The pulsed nature of our protocols provides more direct access to these quantum correlations in the time domain, with applications including quantum metrology and tests of quantum decoherence. By considering a parameter set based on recent experiments, the feasibility to generate significant entanglement with our schemes, even with large optical losses, is demonstrated.

Place, publisher, year, edition, pages
2020. Vol. 22, no 6, article id 063001
Keywords [en]
quantum optics, cavity quantum optomechanics, quantum measurement, entanglement, Gaussian quantum states
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Physical Sciences
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URN: urn:nbn:se:su:diva-183531DOI: 10.1088/1367-2630/ab7dddISI: 000543085200001OAI: oai:DiVA.org:su-183531DiVA, id: diva2:1455941
Available from: 2020-07-29 Created: 2020-07-29 Last updated: 2024-01-17Bibliographically approved

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Pikovski, Igor

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