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| HAL : hal-00596643, version 1 |
| DOI : 10.1103/PhysRevLett.100.050405 |
| Fiche détaillée |  Récupérer au format |
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| Physical Review Letters 100, 5 (2008) 050405 |
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| Fidelity Decay in Trapped Bose-Einstein Condensates |
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| Giovanni Manfredi 1, 2Paul-Antoine Hervieux 1, 2 |
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| CALVI Collaboration(s) |
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| (08/02/2008) |
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| The quantum coherence of a Bose-Einstein condensate is studied using the concept of quantum fidelity (Loschmidt echo). The condensate is confined in an elongated anharmonic trap and subjected to a small random potential such as that created by a laser speckle. Numerical experiments show that the quantum fidelity stays constant until a critical time, after which it drops abruptly over a single trap oscillation period. The critical time depends logarithmically on the number of condensed atoms and on the perturbation amplitude. This behavior may be observable by measuring the interference fringes of two condensates evolving in slightly different potentials. |
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| 1 : | Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) |
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Université de Strasbourg – CNRS : UMR7504 |
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| 2 : | CALVI (INRIA Nancy - Grand Est / IECN / LSIIT / IRMA) |
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CNRS : UMR7005 – INRIA – Université de Strasbourg – Université de Lorraine |
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| Domaine | : | Physique/Physique Quantique Physique/Physique/Physique Atomique Physique/Matière Condensée/Gaz Quantiques |
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| Bose-Einstein condensate – quantum fidelity – Loschmidt echo – quantum coherence |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00596643, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00596643 | |
| oai:hal.archives-ouvertes.fr:hal-00596643 | |
| Contributeur : Paul-Antoine Hervieux | |
| Soumis le : Dimanche 29 Mai 2011, 15:19:29 | |
| Dernière modification le : Mercredi 29 Juin 2011, 10:36:50 | |
