Entanglement at the boundary of spin chains near a quantum critical point and in systems with boundary critical points

Details Entanglement at the boundary of spin chains near a quantum critical point and in systems with boundary critical points Entanglement at the boundary of spin chains near a quantum critical point and in systems with boundary critical points

2004-03-18

arxiv.org/abs/quant-ph/0403135v1

Phys. Rev. A 70, 022313 (2004)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevA.70.022313

We analyze the entanglement properties of spins (qubits) attached to the boundary of spin chains near quantum critical points, or to dissipative environments, near a boundary critical point, such as Kondo-like systems or the dissipative two level system. In the first case, we show that the properties of the entanglement are significantly different from those for bulk spins. The influence of the proximity to a transition is less marked at the boundary. In the second case, our results indicate that the entanglement changes abruptly at the point where coherent quantum oscillations cease to exist. The phase transition modifies significantly less the entanglement.

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