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 Vienna

University of Hanover

K. Winkler

University of Vienna

J. Hoelscher-Obermaier

University of Vienna

S. G. Hofer

University of Hanover

University of Vienna

R. Moghadas Nia

University of Vienna

N. Walk

Freie Universität Berlin

A. Steffens

Freie Universität Berlin

J. Eisert

Freie Universität Berlin

Witlef Wieczorek

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

J. A. Slater

Delft University of Technology

University of Vienna

M. Aspelmeyer

University of Vienna

Austrian Academy of Sciences

K. Hammerer

University of Hanover

PHYSICAL REVIEW RESEARCH

2643-1564 (eISSN)

Vol. 2 3 033244

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1103/PhysRevResearch.2.033244

More information

Latest update

1/21/2021