Fidelity Decay in Trapped Bose-Einstein Condensates
Journal Article
·
· Physical Review Letters
- Institut de Physique et Chimie des Materiaux, CNRS and Universite Louis Pasteur, BP 43, F-67034 Strasbourg (France)
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.
- OSTI ID:
- 21024702
- Journal Information:
- Physical Review Letters, Vol. 100, Issue 5; Other Information: DOI: 10.1103/PhysRevLett.100.050405; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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