title: Deterministic generation of multiparticle entanglement by quantum Zeno dynamics.
abstract: Multiparticle entangled quantum states, a key resource in quantum-enhanced metrology and computing, are usually generated by coherent operations exclusively. However, unusual forms of quantum dynamics can be obtained when environment coupling is used as part of the state generation. In this work, we used quantum Zeno dynamics (QZD), based on nondestructive measurement with an optical microcavity, to deterministically generate different multiparticle entangled states in an ensemble of 36 qubit atoms in less than 5 microseconds. We characterized the resulting states by performing quantum tomography, yielding a time-resolved account of the entanglement generation. In addition, we studied the dependence of quantum states on measurement strength and quantified the depth of entanglement. Our results show that QZD is a versatile tool for fast and deterministic entanglement generation in quantum engineering applications.
authors.affiliation: Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie Curie Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Barontini
authors.affiliation: Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie Curie Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Leander
authors.initials: L
authors.lastname: Hohmann
authors.affiliation: Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie Curie Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Florian
authors.initials: F
authors.lastname: Haas
authors.affiliation: Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie Curie Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Estève
authors.affiliation: Laboratoire Kastler Brossel, École Normale Supérieure, Université Pierre et Marie Curie Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France. jakob.reichel@ens.fr.
authors.forename: Jakob
authors.initials: J
authors.lastname: Reichel