Three different systems of two noninteracting parts

Figure 1. Three different systems of two noninteracting parts. A composite reservoir (two grey circular plates) mediates between the two parts of the system. A blue plate stands for a cavity field while a red plate represents an atomic ensemble. A line denotes the system–reservoir interaction. (a) A dual atomic reservoir enters between two cavity fields [27]. (b) A dual cavity reservoir is used between two atomic ensembles [32]. (c) An atom–cavity reservoir mediates between an atomic ensemble and a cavity field. The last scheme has not been explored yet and will be addressed in the present work.

Abstract

We show that it is possible to use an atom–cavity reservoir to prepare the two-mode squeezed and entangled states of a hybrid system of an atomic ensemble and an optical field, which do not directly interact with each other. The essential mechanism is based on the combined effect of a two-mode squeezing interaction and a beam–splitter interaction between the system and the reservoir. The reservoir mechanism is important for quantum networking in that it allows an interface between a localized matter-based memory and an optical carrier of quantum information without direct interaction.