Squeezed Light Induced Symmetry Breaking Superradiant Phase Transition

Physical Review Letters
C J ZhuG S Agarwal

Abstract

We theoretically investigate the quantum phase transition in the collective systems of qubits in a high quality cavity, where the cavity field is squeezed via the optical parametric amplification process. We show that the squeezed light induced symmetry breaking can result in quantum phase transition without the ultrastrong coupling requirement. Using the standard mean field theory, we derive the condition of the quantum phase transition. Surprisingly, we show that there exists a tricritical point where the first- and second-order phase transitions meet. With specific atom-cavity coupling strengths, both the first- and second-order phase transition can be controlled by the nonlinear gain coefficient, which is sensitive to the pump field. These features also lead to an optical switching from the normal phase to the superradiant phase by just increasing the pump field intensity. The signature of these phase transitions can be observed by detecting the phase space Wigner function distribution with different profiles controlled by the squeezed light intensity. Such superradiant phase transition can be implemented in various quantum systems, including atoms, quantum dots, and ions in optical cavities as well as the circuit quantum e...Continue Reading

References

Mar 5, 2004·Physical Review Letters·Neill LambertTobias Brandes
Sep 28, 2004·Physical Review Letters·Chiu Fan Lee, Neil F Johnson
Dec 31, 2005·Physical Review Letters·Hongliang MaJing Zhang
Apr 30, 2010·Nature·Kristian BaumannTilman Esslinger
Jan 15, 2011·Physical Review Letters·J CasanovaE Solano
Nov 14, 2015·Physical Review Letters·Myung-Joong HwangMartin B Plenio
Oct 1, 2016·Physical Review Letters·Myung-Joong Hwang, Martin B Plenio
May 19, 2018·Physical Review Letters·M SorienteO Zilberberg
Apr 6, 2019·Physical Review Letters·Farokh MivehvarFrancesco Piazza

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