2010/06/30 by Hanna Krauter, Christine A. Muschik, Kasper Jensen +4 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.107.080503
published as Phys. Rev. Lett. 107, 080503 (2011) · This is an update of the preprint from June 2010. It includes new results on the creation of steady state entanglement, which has been maintained up to one hour
arxiv created 2011/09/12 · arxiv updated 2015/05/19
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 1012 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.