Volume 116, Number 5, December 2016
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||20 January 2017|
Quantum phase transitions in the driven dissipative Jaynes-Cummings oscillator: From the dispersive regime to resonance
Department of Physics and Astronomy, University College London - Gower Street, London, WC1E 6BT, UK
Received: 19 October 2016
Accepted: 16 December 2016
We follow the passage from complex amplitude bistability to phase bistability in the driven dissipative Jaynes-Cummings oscillator. Quasi-distribution functions in the steady state are employed, for varying qubit-cavity detuning and drive parameters, in order to track a first-order dissipative quantum phase transition up to the critical point marking a second-order transition and spontaneous symmetry breaking. We demonstrate the photon blockade breakdown in the dispersive regime, and find that the coexistence of cavity states in the regime of quantum bistability is accompanied by pronounced qubit-cavity entanglement. Focusing on the effect of quantum-activated switching for both coupled degrees of freedom, we move from a region of minimal entanglement in the dispersive regime, where we derive analytical perturbative results, to the threshold behaviour of spontaneous dressed-state polarization at resonance.
PACS: 42.50.Ct – Quantum description of interaction of light and matter; related experiments / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 03.65.Yz – Decoherence; open systems; quantum statistical methods
© EPLA, 2016
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