Control in cavity QED with many atoms

Tracy E. Northup, A. David. Boozer, Ryan Miller +3 more

Xinghua Li

A scheme is proposed for teleporting a controlled-not gate via cavity QED.In the scheme,since the frequency of the atomic transition is large detune to the cavity,the cavity is only virtually excited,so that there is no energy exchange between the cavity and the atomic system.Thus the requirement on the quality of the cavity is greatly loosened.

Thomas Wellens, Andreas Buchleitner

Yuanhua Li, Cuicui Li, Xianping Wang +2 more

We propose an experimentally feasible protocol for implementing controlled dense coding with a six-atom cluster state in cavity QED. In the scheme, we investigate that the atoms interact simultaneously with the highly detuned single-mode cavity and the strong classical driving field, and thus our scheme is not sensitive to both the cavity decay and the thermal field. In addition, the four-atom entangled states can be exactly distinguished by performing the single-atom measurements in cavity QED, therefore our scheme might be implemented in a simple way.

Ullrich Martini, Axel Schenzle

Guoqing Yang, Zheng Tan, Bichen Zou +1 more

We show that by manipulating quantum interference in a multi-atom cavity QED system, the nonlinear excitation of the cavity-atom polariton can be resonantly enhanced while the linear excitation is suppressed. Under appropriate conditions, it is possible to selectively enhance or suppress the polariton excitation with two free-pace laser fields. We report an experiment with cold Rb atoms in an optical cavity and present experimental results that demonstrate such interference control of the cavity QED excitation and its direct applications for studies of all-optical switching and cross-phase modulation of the cavity transmitted light.