Work

Superradiant Phase Transitions and the Standard Description of Circuit QED

Year: 2011

Type: article

Abstract: We investigate the equilibrium behavior 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 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.107.113602

Authors: Oliver Viehmann, Jan von Delft, Florian Marquardt

Institutions: Center for NanoScience, Ludwig-Maximilians-Universität München, Friedrich-Alexander-Universität Erlangen-Nürnberg

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Deutsche Forschungsgemeinschaft

Award: G1116235337