Entanglement in the XX spin chain with an energy current

Details Entanglement in the XX spin chain with an energy current Entanglement in the XX spin chain with an energy current

2004-12-15

arxiv.org/abs/quant-ph/0412118v2

PRA 71, 042318 (2005)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.71.042318

We consider the ground state of the XX chain that is constrained to carry a current of energy. The von Neumann entropy of a block of $L$ neighboring spins, describing entanglement of the block with the rest of the chain, is computed. Recent calculations have revealed that the entropy in the XX model diverges logarithmically with the size of the subsystem. We show that the presence of the energy current increases the prefactor of the logarithmic growth. This result indicates that the emergence of the energy current gives rise to an increase of entanglement.

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