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  Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus

Gut, C., Winkler, K., Hoelscher-Obermaier, J., Hofer, S. G., Nia, R. M., Walk, N., et al. (2020). Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus. Physical Review Research, 2: 033244. doi:10.1103/PhysRevResearch.2.033244.

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Gut, C.1, Author              
Winkler, K., Author
Hoelscher-Obermaier, J., Author
Hofer , S. G.1, Author
Nia, R. Moghadas, Author
Walk, N., Author
Steffens, A., Author
Eisert, J., Author
Wieczorek, W., Author
Slater, J. A., Author
Aspelmeyer, M., Author
Hammerer, K.1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Quantum Physics, quant-ph, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall
 Abstract: We provide an argument to infer stationary entanglement between light and a mechanical oscillator based on continuous measurement of light only. We propose an experimentally realizable scheme involving an optomechanical cavity driven by a resonant, continuous-wave field operating in the non-sideband-resolved regime. This corresponds to the conventional configuration of an optomechanical position or force sensor. We show analytically that entanglement between the mechanical oscillator and the output field of the optomechanical cavity can be inferred from the measurement of squeezing in (generalized) Einstein-Podolski-Rosen quadratures of suitable temporal modes of the stationary light field. Squeezing can reach levels of up to 50% of noise reduction below shot noise in the limit of large quantum cooperativity. Remarkably, entanglement persists even in the opposite limit of small cooperativity. Viewing the optomechanical device as a position sensor, entanglement between mechanics and light is an instance of object-apparatus entanglement predicted by quantum measurement theory.

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 Dates: 2019-12-032020-08-132020
 Publication Status: Published in print
 Pages: 18 pages, 7 figures
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 1912.01635
DOI: 10.1103/PhysRevResearch.2.033244
 Degree: -

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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 2 Sequence Number: 033244 Start / End Page: - Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564