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No-go theorem for superradiant quantum phase transitions in cavity QED and counter-example in circuit QED

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  • Pierre Nataf

    (Laboratoire Matériaux ét Phénomènes Quantiques, Université Paris Diderot-Paris 7 and CNRS, Bâtiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.)

  • Cristiano Ciuti

    (Laboratoire Matériaux ét Phénomènes Quantiques, Université Paris Diderot-Paris 7 and CNRS, Bâtiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.)

Abstract

In cavity quantum electrodynamics (QED), the interaction between an atomic transition and the cavity field is measured by the vacuum Rabi frequency Ω0. The analogous term 'circuit QED' has been introduced for Josephson junctions, because superconducting circuits behave as artificial atoms coupled to the bosonic field of a resonator. In the regime with Ω0 comparable with the two-level transition frequency, 'superradiant' quantum phase transitions for the cavity vacuum have been predicted, for example, within the Dicke model. In this study, we prove that if the time-independent light-matter Hamiltonian is considered, a superradiant quantum critical point is forbidden for electric dipole atomic transitions because of the oscillator strength sum rule. In circuit QED, the analogous of the electric dipole coupling is the capacitive coupling, and such no-go property can be circumvented by Cooper pair boxes capacitively coupled to a resonator, because of their peculiar Hilbert space topology and a violation of the corresponding sum rule.

Suggested Citation

  • Pierre Nataf & Cristiano Ciuti, 2010. "No-go theorem for superradiant quantum phase transitions in cavity QED and counter-example in circuit QED," Nature Communications, Nature, vol. 1(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1069
    DOI: 10.1038/ncomms1069
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    Cited by:

    1. Xi Chen & Ze Wu & Min Jiang & Xin-You Lü & Xinhua Peng & Jiangfeng Du, 2021. "Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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