Theoretical analysis of a realistic atom-chip quantum gate

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E. Charron,¹ M. A. Cirone,² A. Negretti,^2,3 J. Schmiedmayer,⁴ and T. Calarco^2,5
¹Laboratoire de Photophysique Moléculaire du CNRS, Bâtiment 210, Université Paris-Sud, 91405 Orsay Cedex, France
²ECT, Strada delle Tabarelle 286, I-38050 Villazzano, Trento, Italy and Dipartimento di Fisica, Università di Trento, and BEC-CNR-INFM, I-38050 Povo, Italy
³Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
⁴Physikalisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany
⁵ITAMP, Harvard Smithsonian Center for Astrophysics, and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Received 17 March 2006; published 10 July 2006

Wepresent a detailed, realistic analysis of the implementation of aproposal for a quantum phase gate based on atomic vibrationalstates, specializing it to neutral rubidium atoms on atom chips.We show how to create a double-well potential with staticcurrents on the atom chips, using for all relevant parametersvalues that are achieved with present technology. The potential barrierbetween the two wells can be modified by varying thecurrents in order to realize a quantum phase gate forqubit states encoded in the atomic external degree of freedom.The gate performance is analyzed through numerical simulations; the operationtime is ~10 ms with a performance fidelity above 99.9%. Forstorage of the state between the operations the qubit statecan be transferred efficiently via Raman transitions to two hyperfinestates, where its decoherence is strongly inhibited. In addition wediscuss the limits imposed by the proximity of the surfaceto the gate fidelity.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.012308
DOI:	10.1103/PhysRevA.74.012308
PACS:	03.67.Lx; 32.80.Pj; 39.25.+k 03.67.Lx Quantum computation 32.80.Pj Optical cooling of atoms; trapping 39.25.+k Atom manipulation including scanning probe microscopy, laser cooling, etc YEAR: 2006
KEYWORDS:	quantum gates

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