Stationary optomechanical entanglement between a mechanical oscillator and its measurement apparatus
Journal article, 2020
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.
Author
C. Gut
University of Hanover
University of Vienna
K. Winkler
University of Vienna
J. Hoelscher-Obermaier
University of Vienna
S. G. Hofer
University of Vienna
University of Hanover
R. Moghadas Nia
University of Vienna
N. Walk
Freie Universität Berlin
A. Steffens
Freie Universität Berlin
J. Eisert
Freie Universität Berlin
Witlef Wieczorek
University of Vienna
J. A. Slater
University of Vienna
Delft University of Technology
M. Aspelmeyer
Austrian Academy of Sciences
University of Vienna
K. Hammerer
University of Hanover
PHYSICAL REVIEW RESEARCH
2643-1564 (eISSN)
Vol. 2 3 033244Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Other Physics Topics
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1103/PhysRevResearch.2.033244