title: Entanglement generated by dissipation and steady state entanglement of two macroscopic objects.
abstract: 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.
authors.affiliation: Niels Bohr Institute, Danish Quantum Optics Center QUANTOP, Copenhagen University, Copenhagen, Denmark.
authors.forename: Hanna
authors.initials: H
authors.lastname: Krauter
authors.forename: Christine A
authors.initials: CA
authors.lastname: Muschik
authors.forename: Kasper
authors.initials: K
authors.lastname: Jensen
authors.forename: Wojciech
authors.initials: W
authors.lastname: Wasilewski
authors.forename: Jonas M
authors.initials: JM
authors.lastname: Petersen
authors.forename: J Ignacio
authors.initials: JI
authors.lastname: Cirac
authors.forename: Eugene S
authors.initials: ES
authors.lastname: Polzik