Journal article
Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates
- Abstract:
- We investigate the influence of a Bose-Einstein condensate (BEC) on the properties of immersed impurity atoms, which are trapped in an optical lattice. Assuming a weak coupling of the impurity atoms to the BEC, we derive a quantum master equation (QME) for the lattice system. In the special case of fixed impurities with two internal states the atoms represent a quantum register and the QME reproduces the exact evolution of the qubits. We characterize the qubit dephasing which is caused by the interspecies coupling and show that the effect of sub- and super-decoherence is observable for realistic experimental parameters. Furthermore, the BEC phonons mediate an attractive interaction between the impurities, which has an important impact on their spatial distribution. If the lattice atoms are allowed to move, there occurs a sharp transition with the impurities aggregating in a macroscopic cluster at experimentally achievable temperatures. We also investigate the impact of the BEC on the transport properties of the impurity atoms and show that a crossover from coherent to diffusive behaviour occurs with increasing interaction strength.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.2MB, Terms of use)
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- Publisher copy:
- 10.1088/1367-2630/9/11/411
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- Grant:
- GR/S82176/01; EP/E041612/1
- Publisher:
- Institute of Physics Publishing Ltd.
- Journal:
- New Journal of Physics More from this journal
- Volume:
- 9
- Issue:
- 11
- Article number:
- 411
- Publication date:
- 2007-11-01
- Edition:
- Publisher's version
- DOI:
- EISSN:
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1367-2630
- Language:
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English
- Keywords:
- Subjects:
- UUID:
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uuid:51f8188d-503e-4a4d-bca5-562c0c78520e
- Local pid:
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ora:2496
- Deposit date:
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2009-01-09
Terms of use
- Copyright holder:
- IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
- Copyright date:
- 2007
- Notes:
- Citation: Klein, A., Bruderer, M., Clark, S. R. & Jaksch, D. (2007). 'Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates', New Journal of Physics, 9(11), 411. [Available at http://www.njp,org]. This is an Open Access article published under the terms of the Creative Commons Attribution Non Commercial ShareAlike 2.5 licence (http://creativecommons.org/licenses/by-nc-sa/2.5/deed.en_GB). This licence permits third-party users to copy, distribute and display the published version of the article, and create derivative works, subject to appropriate acknowledgement of the original authors, and provided the article is not used for commercial purposes. If you alter, transform, or build upon this work, you may distribute the resulting work only under a licence identical to this one. For any reuse or distribution, you must make clear to others the licence terms of this work.
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