Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.52: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Spatial decoherence of ions near surfaces — •Kristine Karstens and Stefan Scheel — Institut für Physik, Universität Rostock, 18051 Rostock, Germany

Decoherence is a fundamental mechanism that destroys quantum mechanical superpositions of quantum states. It provides a limiting factor in the ability to coherently manipulate quantum systems such as atoms or ions. One particular example is path decoherence of coherently split particle beams [1].

Here we derive an expression for the spatial decoherence rate of coherently split beams of ions near metallic and superconducting surfaces. Our investigation is based on the formalism of macroscopic quantum electrodynamics [2] and the decoherence functional [3]. We evaluate the contributions of the possible charge-charge, charge-dipole and dipole-dipole interactions between the particles and their mirror images [4].

[1] P. Sonnentag and F. Hasselbach, Phys. Rev. Lett. 98, 200402 (2007).

[2] S. Scheel and S. Y. Buhmann, Acta Phys. Slov. 58, 675 (2008).

[3] H.-P. Breuer and F. Petruccione, The Theory of Open Quantum Systems, Oxford University Press, Oxford (2002).

[4] S. Scheel and S. Y. Buhmann, Phys. Rev. A 85, 030101 (2012).