Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-06-28
Europhysics Letters 69, 8 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures. Minor changes. Published version
Scientific paper
10.1209/epl/i2004-10313-4
We show that the quantum phase transition arising in a standard radiation-matter model (Dicke model) belongs to the same universality class as the infinitely-coordinated, transverse field XY model. The effective qubit-qubit exchange interaction is shown to be proportional to the square of the qubit-radiation coupling. A universal finite-size scaling is derived for the corresponding two-qubit entanglement (concurrence) and a size-consistent effective Hamiltonian is proposed for the qubit subsystem.
Johnson Neil F.
Quiroga Luis
Reslen Jose
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