Electrodynamic Displacement of Atomic Energy Levels

V. N. Streltsov

E. S. Guerra, J. C. Retamal

In this work we propose a scheme in which it is possible to generate atomic Greenberger—Horner—Zeilinger (GHZ) states by letting three-level atoms in a lambda configuration interact with a cavity field followed by a displacement of the cavity field and selective measurements on two-level atoms which disentangle the atoms and field states. We also propose a GHZ test based on such states.

Shi Mei-Zhen, Chuangshe Li, Zuo Cui-Cui +6 more

We demonstrate our experiment of controlling spatial displacements of the probe beam induced by the cross-Kerr effect in a three-level V-type atomic system. By increasing the atomic density or the intensity of strong control laser beams, spatial displacements are enhanced. We further study the difference of effects from the atomic density and the laser intensity. In addition, the spatial displacement efficiencies of the probe beam in different energy level atomic systems are compared. Such studies of controlling spatial displacements can have potential applications in soliton deflection, spatial optical switch and generating spatially correlated (entangled) laser beams in multi-level EIT systems.

John Stuart Foster

Bryan J. Dalton, M. Babiker

We extend previous work on macroscopic canonical quantization leading to a multipolar Hamiltonian appropriate for application to quantum optics and cavity QED situations involving classical optical devices. In particular, we show that the electric displacement is the negative of the conjugate momentum field and that the Coulomb and polarization energies are equal to the sum of intra-atomic Coulomb and polarization energies and interatomic contact energies. The quantum Hamiltonian is now in a form in which the theory is manifestly gauge invariant.

Georges Lochak