Tuesday, January 15, 2013

1301.2973 (Wassilij Kopylov et al.)

Counting statistics of the Dicke superradiance phase transition    [PDF]

Wassilij Kopylov, Clive Emary, Tobias Brandes
We consider a driven single mode Dicke-Hamiltonian coupled to a dissipative zero-temperature bath. We derive the cumulant generating function for emitted photons of this quantum-critical system by using a $P$-representation of the master equation in the thermodynamic limit. This cumulant generating function is shown to consist of two parts: a macroscopic component, which is Poissonian in nature with characteristic rate proportional to the order parameter of the system; and a part describing fluctuations which is non-trivial in form and divergent around the quantum phase transition.
View original: http://arxiv.org/abs/1301.2973

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