Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates
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...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal article |
| Language: | English |
| Published: |
Institute of Physics Publishing Ltd.
2007
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| Subjects: |
| _version_ | 1797068493903888384 |
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| author | Klein, A Bruderer, M Clark, S Jaksch, D |
| author2 | Deutsche Physikalische Gesellschaft |
| author_facet | Deutsche Physikalische Gesellschaft Klein, A Bruderer, M Clark, S Jaksch, D |
| author_sort | Klein, A |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-06T22:11:32Z |
| format | Journal article |
| id | oxford-uuid:51f8188d-503e-4a4d-bca5-562c0c78520e |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:11:32Z |
| publishDate | 2007 |
| publisher | Institute of Physics Publishing Ltd. |
| record_format | dspace |
| spelling | oxford-uuid:51f8188d-503e-4a4d-bca5-562c0c78520e2022-03-26T16:22:51ZDynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensatesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:51f8188d-503e-4a4d-bca5-562c0c78520eAtomic and laser physicsPhysicsEnglishOxford University Research Archive - ValetInstitute of Physics Publishing Ltd.2007Klein, ABruderer, MClark, SJaksch, DDeutsche Physikalische GesellschaftWe 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. |
| spellingShingle | Atomic and laser physics Physics Klein, A Bruderer, M Clark, S Jaksch, D Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title | Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title_full | Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title_fullStr | Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title_full_unstemmed | Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title_short | Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates |
| title_sort | dynamics dephasing and clustering of impurity atoms in bose einstein condensates |
| topic | Atomic and laser physics Physics |
| work_keys_str_mv | AT kleina dynamicsdephasingandclusteringofimpurityatomsinboseeinsteincondensates AT brudererm dynamicsdephasingandclusteringofimpurityatomsinboseeinsteincondensates AT clarks dynamicsdephasingandclusteringofimpurityatomsinboseeinsteincondensates AT jakschd dynamicsdephasingandclusteringofimpurityatomsinboseeinsteincondensates |