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Circuit QED scheme for the realization of the Lipkin-Meshkov-Glick model
Stockholm University, Faculty of Science, Department of Physics.
2010 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 90, no 5, 54001- p.Article in journal (Refereed) Published
Abstract [en]

We propose a scheme in which the Lipkin-Meshkov-Glick model is realized within a circuit QED system. An array of N superconducting qubits interacts with a driven cavity mode. In the dispersive regime, the cavity mode is adiabatically eliminated generating an effective model for the qubits alone. The characteristic long-range order of the Lipkin-Meshkov-Glick model is here mediated by the cavity field. For a closed qubit system, the inherent second-order phase transition of the qubits is reflected in the intensity of the output cavity field. In the broken symmetry phase, the many-body ground state is highly entangled. Relaxation of the qubits is analyzed within a mean-field treatment. The second-order phase transition is lost, while new bistable regimes occur.

Place, publisher, year, edition, pages
2010. Vol. 90, no 5, 54001- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-48970DOI: 10.1209/0295-5075/90/54001ISI: 000280061500011OAI: diva2:376335
authorCount :1Available from: 2010-12-10 Created: 2010-12-10 Last updated: 2010-12-14Bibliographically approved

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Larson, Jonas
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