Condensates beyond mean field theory: quantum backreaction as decoherence

Abstract

We propose an experiment to measure the slow log(N) convergence to mean-field theory (MFT) around a dynamical instability. Using a density matrix formalism, we derive equations of motion which go beyond MFT and provide accurate predictions for the quantum break-time. The leading quantum corrections appear as decoherence of the reduced single-particle quantum state.

4 pages, 4 figures, submitted to Phys. Rev. Lett

References in corpus (1)

• Watching a superfluid untwist itself: Recurrence of Rabi oscillations in a Bose-Einstein condensate

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