Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 64: Quanteneffekte: Verschränkung
Q 64.10: Talk
Friday, March 6, 2009, 16:15–16:30, VMP 6 HS-D
Creation and control of atomic entanglement by means of optical cavities — •Denis Gonta1 and Stephan Fritzsche2,3 — 1Max–Planck–Institut für Kernphysik, Postfach 103980, D–69029 Heidelberg — 2Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, D-69120 Heidelberg — 3Frankfurt Institute for Advanced Studies, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main
Cavity QED provides an excellent tool to control the interaction between two distant neutral atoms, for example, when the atoms pass through the cavity and are coupled simultaneously to the same cavity mode. This opens a route towards the implementation of entanglement and quantum gates via cavity-mediated atom-atom interactions.
In this contribution, a scheme is proposed to generate a entangled state between two (Λ-type) four-level atoms, which are interacting effectively by means of an off-resonant optical cavity and a laser beam. We show how the degree of entanglement for two atoms passing subsequently through the cavity depends on their velocity and the (initial) distance between the atoms. In addition, we suggest schemes to implement various two-qubit gates within the framework of the proposed atom-cavity-laser setup. For all these schemes, we display and discuss the atomic velocities and inter-atomic distances for which these gates are realized.