{ "id": "1212.3594", "version": "v3", "published": "2012-12-14T20:46:49.000Z", "updated": "2013-07-30T05:05:39.000Z", "title": "Bloch Oscillations of Cold Atoms in a Cavity: Effects of Quantum Noise", "authors": [ "B. Prasanna Venkatesh", "D. H. J. O'Dell" ], "comment": "25 pages, 14 figures", "journal": "Phys. Rev. A 88, 013848 (2013)", "doi": "10.1103/PhysRevA.88.013848", "categories": [ "quant-ph", "cond-mat.quant-gas", "physics.atom-ph", "physics.optics" ], "abstract": "We extend our theory of Bloch oscillations of cold atoms inside an optical cavity [ Venkatesh et al. Phys. Rev. A 80 063834 (2009)] to include the effects of quantum noise arising from coupling to external modes. The noise acts as a form of quantum measurement backaction by perturbing the coupled dynamics of the atoms and the light. We take it into account by solving the Heisenberg-Langevin equations for linearized fluctuations about the atomic and optical mean fields and examine how this influences the signal-to-noise ratio of a measurement of external forces using this system. In particular, we investigate the effects of changing the number of atoms, the intracavity lattice depth, and the atom-light coupling strength, and show how resonances between the Bloch oscillation dynamics and the quasiparticle spectrum have a strong influence on the signal-to-noise ratio, as well as heating effects. One of the hurdles we overcome in this paper is the proper treatment of fluctuations about time-dependent mean fields in the context of cold-atom cavity QED.", "revisions": [ { "version": "v3", "updated": "2013-07-30T05:05:39.000Z" } ], "analyses": { "keywords": [ "quantum noise", "signal-to-noise ratio", "bloch oscillation dynamics", "quantum measurement backaction", "time-dependent mean fields" ], "tags": [ "journal article" ], "publication": { "publisher": "APS", "journal": "Phys. Rev. A" }, "note": { "typesetting": "TeX", "pages": 25, "language": "en", "license": "arXiv", "status": "editable", "adsabs": "2012arXiv1212.3594P" } } }