Direct equivalence between quantum phase transition phenomena in radiation-matter and magnetic systems: Scaling of entanglement

J. Reslen, L. Quiroga, N. F. Johnson

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)8-14
Number of pages7
JournalEurophysics Letters
Volume69
Issue number1
DOIs
StatePublished - Jan 1 2005

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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