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arXiv · 2005.14438

Decay of symmetry-protected quantum states

A. A. Bychek·D. N. Maksimov·A. R. Kolovsky
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Abstract

We study the decay of bosonic many-body states in the three well Bose-Hubbard chain where bosons in the central well can escape into a reservoir. For vanishing inter-particle interaction this system supports a non-decaying many-body state which is the antisymmetric Bose-Einstein condensate with particles occupying only the edge wells. In the classical approach this quantum state corresponds to a symmetry protected non-decaying state which is stable even at finite interaction below a certain intensity threshold. Here we demonstrate that despite the classical counterpart is stable the antisymmetric Bose-Einstein condensate is always metastable at finite interatomic interactions due to quantum fluctuations.

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A. A. Bychek, D. N. Maksimov, A. R. Kolovsky. 2020-05-29. Decay of symmetry-protected quantum states. https://doi.org/10.1103/physreva.102.033324

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