Interaction of Light with Atoms

Crispin W. Gardiner

Bing Yuan

For the interaction of two entangled atoms with the two-mode squeezed light field,the entanglements between the atom with the light field and that between the two-modes of the light field are studied.Setting that one atom is outside the cavity and the other atom enters the cavity to interact with the light field,generally the entanglement changes periodically and the period is not affected by the rotation angle of the outside atom and the phase difference in the atomic entangled state.But,if the squeezing parameter of the light field and the rotation angle of the atom outside the cavity satisfy a certain relation,atom and the light field will be disentangled forever.

Servet Bayram, A. M. Lyyra, Noureddine Melikechi

Zeyang Li, Boris Braverman, Simone Colombo +6 more

The interaction between an atomic ensemble and a light mode in a high-finesse optical cavity can easily reach the strong-coupling regime, where quantum effects dominate.In this regime, the interaction can be used to generate both atom-light and atom-atom entanglement.We analyze the dominant effects on the collective atomic state and the light field, and derive a unified approach that can account for atomic entanglement induced both by measurements on the light field, and by ignoring the state of the light field altogether.We present analytical expressions for the entanglement induced by the interaction, and determine the conditions that maximize the entanglement-induced gain over the standard quantum limit in quantum sensors and atomic clocks.

Jonathan D. Pritchard

Mai-Lin Liang, Bing Yuan, Zhong Kaisheng

The interaction of the light field with two level atoms possessing dipole dipole interaction is studied. It is shown that a light field at coherent state can produce a squeezed atom laser.