Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 23: Quantum gases: Interaction effects II
Q 23.1: Group Report
Tuesday, March 19, 2013, 11:00–11:30, E 001
Cavity Quantum Electrodynamics with utracold atoms — •Hessam Habibian1,2,3, Stefano Zippilli4, André Winter1, Simone Paganelli2, Fabrizio Illuminati4, Heiko Rieger1, and Giovanna Morigi1 — 1Universität des Saarlandes, Germany — 2Universitat Autonoma de Barcelona — 3ICFO-The Institute of Photonic Sciences, Spain — 4Universita degli Studi di Salerno, Italy
Bragg scattering by atoms in optical lattices has been demonstrated in several experiments. When the atoms are confined in an array inside a resonator, they can elastically scatter photons into the cavity. In this work we assume that the periodicity of the lattice is such that there is no elastic scattering into the cavity mode. In this limit, when the atoms are deep in the Mott-insulator phase, the light at the cavity output can be squeezed or anti-bunched, depending on the amplitude of the laser intensity. We also show that the stationary entanglement between light and spin-wave modes of the array can be generated. While for point-like atoms photon scattering into the cavity is suppressed, for sufficiently strong lasers quantum fluctuations can support the build-up of an intracavity field. Numerical simulations show that for large parameter regions cavity backaction forces the atoms into clusters with a local checkerboard density distribution. The clusters are phase locked one with another so to maximize the number of intracavity photons. This state can be revealed in a non-destructive way by measuring the light at the cavity output. We argue that this system constitutes a novel setting where quantum fluctuations give rise to effects usually associated with disorder.