Superradiant Phase Transitions and the Standard Description of Circuit QED

Details Superradiant Phase Transitions and the Standard Description of Circuit QED Superradiant Phase Transitions and the Standard Description of Circuit QED

2011-03-23

arxiv.org/abs/1103.4639v1

Phys. Rev. Lett. 107, 113602 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+6 pages, 3+1 figures

Scientific paper

10.1103/PhysRevLett.107.113602

We investigate the equilibrium behaviour of a superconducting circuit QED system containing a large number of artificial atoms. It is shown that the currently accepted standard description of circuit QED via an effective model fails in an important aspect: it predicts the possibility of a superradiant quantum phase transition, even though a full microscopic treatment reveals that a no-go theorem for such phase transitions known from cavity QED applies to circuit QED systems as well. We generalize the no-go theorem to the case of (artificial) atoms with many energy levels and thus make it more applicable for realistic cavity or circuit QED systems.

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