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quant-ph2004★ 58 cited
Entanglement in the XX spin chain with an energy current
V. Eisler, Z. Zimboras
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 neighboring spins, describing entanglement…
quant-ph2003★ 13 cited
Mixed State Geometric Phase from Thomas Rotations
Péter Lévay
It is shown that Uhlmann's parallel transport of purifications along a path of mixed states represented by density matrices is just the path ordered product of Thomas r…