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International Conference on Quantum Information

Entanglement Generated by Dissipation

Christine A. Muschik, Hanna Krauter, Kasper Jensen, Wojciech Wasilewski, J. M. Petersen, J. I. Cirac, Eugene Simon Polzik

Published Jan 1, 2011• 6 citations
Publisher

Abstract

We present a robust method for generating entanglement by engineered dissipation. Two atomic ensembles are kept entangled for 0.04s. By combining the purely dissipative mechanism with measurements, steady state entanglement is observed for up to an hour.
DOI
10.1364/icqi.2011.qmh1

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Entanglement is a striking feature of quantum mechanics and an essential ingredient in most applications in quantum information. Typically, coupling of a system to an environment inhibits entanglement, particularly in macroscopic systems. Here we report on an experiment, where dissipation continuously generates entanglement between two macroscopic objects. This is achieved by engineering the dissipation using laser- and magnetic fields, and leads to robust event-ready entanglement maintained for 0.04s at room temperature. Our system consists of two ensembles containing about 10^{12} atoms and separated by 0.5m coupled to the environment composed of the vacuum modes of the electromagnetic field. By combining the dissipative mechanism with a continuous measurement, steady state entanglement is continuously generated and observed for up to an hour.
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Entanglement is a striking feature of quantum mechanics and an essential ingredient in most applications in quantum information. Typically, coupling of a system to an environment inhibits entanglement, particularly in macroscopic systems. Here we report on an experiment where dissipation continuously generates entanglement between two macroscopic objects. This is achieved by engineering the dissipation using laser and magnetic fields, and leads to robust event-ready entanglement maintained for 0.04 s at room temperature. Our system consists of two ensembles containing about 10(12) atoms and separated by 0.5 m coupled to the environment composed of the vacuum modes of the electromagnetic field. By combining the dissipative mechanism with a continuous measurement, steady state entanglement is continuously generated and observed for up to 1 h.