Superradiant Phase Transitions and the Standard Description of Circuit QED
Mesoscale and Nanoscale Physics
2011-09-20 v1 Quantum Physics
Abstract
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.
Cite
@article{arxiv.1103.4639,
title = {Superradiant Phase Transitions and the Standard Description of Circuit QED},
author = {Oliver Viehmann and Jan von Delft and Florian Marquardt},
journal= {arXiv preprint arXiv:1103.4639},
year = {2011}
}
Comments
4+6 pages, 3+1 figures