Abstract
We study theoretically the dynamics of two weakly coupled Bose-Josephson junctions, prepared with the same particle number $N$ and Josephson excitation number $\ensuremath{\nu}$ but with different reduced one-particle purity $\ensuremath{\gamma}$. An entropy oscillation mode is predicted, in which one-particle coherence is transferred between the Bose-Hubbard dimers with no particle or energy transfer. We explain this purity oscillation using a semiclassical picture.
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