Atomic spin decoherence near conducting and superconducting films

Details Atomic spin decoherence near conducting and superconducting films Atomic spin decoherence near conducting and superconducting films

2005-01-25

arxiv.org/abs/quant-ph/0501149v1

Physics

Quantum Physics

4 pages, 3 figures, typeset using RevTeX

Scientific paper

10.1103/PhysRevA.72.042901

We derive scaling laws for the spin decoherence of neutral atoms trapped near conducting and superconducting plane surfaces. A new result for thin films sheds light on the measurement of Y.J. Lin, I. Teper, C. Chin, and V. Vuleti\'{c} [Phys. Rev. Lett. \textbf{92}, 050404 (2004)]. Our calculation is based on a quantum-theoretical treatment of electromagnetic radiation near metallic bodies [P.K. Rekdal, S. Scheel, P.L. Knight, and E.A. Hinds, Phys. Rev. A \textbf{70}, 013811 (2004)]. We show that there is a critical atom-surface distance that maximizes the spin relaxation rate and we show how this depends on the skin depth and thickness of the metal surface. In the light of this impedance-matching effect we discuss the spin relaxation to be expected above a thin superconducting niobium layer.

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