Entanglement in the ground state of interacting qubits driven by a quantum field
B. M. Rodríguez-Lara, Ray‐Kuang Lee · arXiv (Cornell University) · 2010
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.