Superfluorescence from an initial squeezed vacuum state

Martin F. H. Schuurmans, D. Polder

Li You, Marek Trippenbach, J. Cooper

An alternative treatment for the initiation of superfluorescence is given. It is explicitly demonstrated that superfluorescence can be initiated by the fluctuation of either the medium or the vacuum field, depending on the calculation scheme used. An alternative numerical simulation using a stochastic field input is shown to be equivalent to that of the usual initial fluctuating dipole distribution over the medium. In some cases this alternative treatment may be more convenient.

Alina-Mihaela Stoica, Аурелиан Исар

Abstract Hellinger geometric quantum discord and interferometric power are investigated for an open system consisting of two bosonic modes interacting with four different environments: vacuum, squeezed vacuum, thermal and squeezed thermal, taking the initial state of the system either a single-mode squeezed state, which presents no correlations, or a squeezed vacuum state. The description of the evolution of the correlations is formulated in the framework of the theory of open systems, based on completely positive quantum dynamical semigroups, using the Gorini-Kossakowski-Lindblad-Sudarshan master equation. We show that both quantum correlations can be generated from an initial factorized state and even amplified, while also studying the back and forth impact of the squeezing parameters on the considered correlations; specifically, for the squeezed vacuum environment, the competition between the influences exerted by the squeezing of the initial state and the squeezing of the environment leads to the decreasing, and even destruction of the correlations, or to their enhancement. In the case of an initial squeezed vacuum state in interaction with the squeezed vacuum environment, for specific conditions one can achieve decoherence-free states (DFS), while for the interaction with a thermal environment there exist regimes of enhancing or decreasing the considered correlations, depending on the parameters of both open system and environment.

Quirin H. F. Vrehen, J. J. der Weduwe

Lingyu Wan

The quantum fluctuations of the voltage and the current in each branch of the quantized generalized mesoscopic RLC parallel circuit in squeezed vacuum state were studied.The factors affecting the fluctuations in each branch were also analyzed.The results show that the quantum fluctuations in each branch of the circuit in squeezed vacuum state are related to the factors which are the elements of the circuit,the parameters of the squeezed vacuum state and the time.All the quantum fluctuations of the voltage and the current in each branch of the circuit decay with time exponentially.The decay rates are related to the elements of the circuit only,not to the parameters of the squeezed vacuum state.The amplitude of the fluctuations at the initial stage depends on the elements of the circuit and the parameters of the squeezed vacuum state.

F. P. Mattar, E. A. Watson, H. M. Gibbs +4 more