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arXiv:quant-ph/0609210 · Physical Review Letters

Creating and Probing Multipartite Macroscopic Entanglement with Light

Mauro Paternostro, David Vitali, Sylvain Gigan, M. S. Kim, Časlav Brukner, Jens Eisert, Markus Aspelmeyer

Published Dec 17, 2007• 321 citations
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Abstract

We propose an immediately realizable scheme showing signatures of multipartite entanglement generated by radiation pressure in a cavity system with a movable mirror. We show how the entanglement involving the inaccessible massive object is unraveled by means of field-field quantum correlations and persists within a wide range of working conditions. Our proposal provides an operative way to infer the quantum behavior of a system that is only partially accessible.

DOI
10.1103/physrevlett.99.250401

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We propose an immediately realizable scheme showing signatures of multipartite entanglement generated by radiation pressure in a cavity system with a movable mirror. We show how the entanglement involving the inaccessible massive object is unraveled by means of field-field quantum correlations and persists within a wide range of working conditions. Our proposal provides an operative way to infer the quantum behavior of a system that is only partially accessible.
We propose a quantum optical version of Schr\"odinger's famous gedanken experiment in which the state of a microscopic system (a cavity field) becomes entangled with and disentangled from the state of a massive object (a movable mirror). Despite the fact that a mixture of Schr\"odinger cat states is produced during the evolution (due to the fact that the macroscopic mirror starts off in a thermal state), this setup allows us to systematically probe the rules by which a superposition of spatially separated states of a macroscopic object decoheres. The parameter regime required to test environment-induced decoherence models is found to be close to those currently realizable, while that required to detect gravitationally induced collapse is well beyond current technology.
We propose a feasible scheme to generate electromagnetically induced transparency (EIT) and quadripartite macroscopic entanglement in an optomechanical system with one fixed mirror and three movable perfectly reflecting mirrors. We explore the EIT phenomena in this optomechanical system. Results show the appearance of EIT dips in the output field. Moreover, we demonstrate how steady-state quadripartite entanglement can be generated via radiation pressure. We also quantify the bipartite entanglement in each field—mirror subsystem and in the mirror—mirror subsystem. Findings show that a high intensity of entanglement between two subsystems can be achieved.
A scheme to generate stationary entanglement in a Fabry-Perot cavity with two-level atoms is proposed in the current paper. The mechanism through which radiation pressure can generate steady-state entanglement is also presented. Moreover, the bipartite entanglement in the field-mirror subsystem is quantified. Logarithmic negativity, which characterizes the entanglement between the two systems, is found to increase from 0.27 to 0.32 with the help of the atoms. Surprisingly, such macroscopic entanglement persists for environment temperatures of about 25 K in this system.