Entanglement in the ground state of interacting qubits driven by a quantum field

Details Entanglement in the ground state of interacting qubits driven by a quantum field Entanglement in the ground state of interacting qubits driven by a quantum field

2010-08-16

arxiv.org/abs/1008.2572v2

Physics

Quantum Physics

12 pages, 2 figures

Scientific paper

We study the ground state entanglement properties of a finite size ensemble of interacting qubits driven by a quantized field. In the absence of driving, the system reduces to a Lipkin-Meshkov-Glick model that presents maximal entanglement at the first of a series of quantum phase transitions; i.e. a W-state of the qubit ensemble. We present exact and numerical solutions, within and without the rotating wave approximation, in that order, showing that a large finite probability of having the maximal entangled state in the ground state is preserved in the driven system.

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