Quantum instability and edge entanglement in a quasi-long-range order

Details Quantum instability and edge entanglement in a quasi-long-range order Quantum instability and edge entanglement in a quasi-long-range order

2008-07-10

arxiv.org/abs/0807.1602v2

Phys. Rev. A 79, 022302 (2009)

Physics

Quantum Physics

5pages and 6 figures

Scientific paper

10.1103/PhysRevA.79.022302

We investigate the build-up of quasi-long-range order in the XX chain with transverse magnetic field at finite size. As the field is varied, the ground state of the system displays multiple level crossings producing a sequence of entanglement jumps. Using the partial fidelity and susceptibility, we study the transition to the thermodynamic limit and argue that the topological order can be described in terms of kink-antikink pairs and marked by edge spin entanglement.

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