Measuring entanglement growth in quench dynamics of bosons in an optical lattice

Daley, A.J. and Pichler, H. and Schachenmayer, J. and Zoller, P. (2012) Measuring entanglement growth in quench dynamics of bosons in an optical lattice. Physical Review Letters, 109 (2). 020505. ISSN 0031-9007

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Abstract

We discuss a scheme to measure the many-body entanglement growth during quench dynamics with bosonic atoms in optical lattices. By making use of a 1D or 2D setup in which two copies of the same state are prepared, we show how arbitrary order Rényi entropies can be extracted by using tunnel coupling between the copies and measurement of the parity of on-site occupation numbers, as has been performed in recent experiments. We illustrate these ideas for a superfluid-Mott insulator quench in the Bose-Hubbard model, and also for hard-core bosons, and show that the scheme is robust against imperfections in the measurements.