Stuttgart 2012 – scientific programme
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A: Fachverband Atomphysik
A 34: Kalte Atome: Manipulation und Detektion
A 34.5: Talk
Thursday, March 15, 2012, 15:00–15:15, V7.03
Classicality from the continuous measurement of a BEC in a double-well potential — •Moritz Hiller1,2, Thomas Konrad3,4, Magnus Rehn3, Francesco Petruccione3, and Andreas Buchleitner2 — 1Institute for Theoretical Physics, Vienna University of Technology, Austria — 2Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, Germany — 3Centre for Quantum Technologies, University of KwaZulu-Natal, Durban, South Africa — 4National Institute of Theoretical Physics, South Africa
We study continuous (unsharp) measurements of a Bose-Einstein condensate (BEC) in a double-well potential. We find, that the interplay between measurement and inter-atomic interactions can drastically reduce the complexity of the quantum many-body wave function – to the extent, that the latter resembles a coherent, i.e., a classical state despite the presence of interactions. We demonstrate that in this regime, the dynamics of the system (including the influence of the measurement) can be monitored faithfully after a certain time. That is, the time-evolving state can be inferred from the measurement signal without destroying the BEC.