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Diode for Bose-Einstein condensates
Stockholm University, Faculty of Science, Department of Physics.
2011 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 96, no 5, 50004- p.Article in journal (Refereed) Published
Abstract [en]

Given a quantum state at some instant of time t, the underlying system Hamiltonian can not only predict how the state will evolve, but also the history of the state prior to t. Thereby, in order to have a directed motion, like in a diode, some sort of irreversibility must be considered. For the atom diode, this has been achieved by spontaneous decay of excited atomic levels. For an atomic condensate, it is clear, however, that such decay will cause both heating and decoherence of the condensate. To overcome this complication we introduce a different setup where the dissipation does not act directly on the atoms. The excited atoms are stimulatedly driven back to the ground state by exciting a cavity mode, which in return decays to the vacuum via photon losses. The efficiency of the method utilizing experimental parameters is shown to be almost perfect within large parameter regimes.

Place, publisher, year, edition, pages
2011. Vol. 96, no 5, 50004- p.
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-71128DOI: 10.1209/0295-5075/96/50004ISI: 000298131900005OAI: diva2:483987
authorCount :1Available from: 2012-01-26 Created: 2012-01-26 Last updated: 2012-01-26Bibliographically approved

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