Abstract
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 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 nontrivial in form and divergent around the quantum phase transition.
- Received 14 January 2013
DOI:https://doi.org/10.1103/PhysRevA.87.043840
©2013 American Physical Society