Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 56: Quanteninformation (Photonen und nichtklassisches Licht I)
Q 56.1: Talk
Friday, March 14, 2008, 11:00–11:15, 1A
Two-mode single-atom laser as a source of entangled light — •Martin Kiffner1, M. Suhail Zubairy1,2, Jörg Evers1, and Christoph H. Keitel1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Institute for Quantum Studies and Department of Physics, Texas A&M University, College Station, Texas 77843, USA and Texas A&M University at Qatar, Education City, P. O. Box 23874, Doha, Qatar
Continuous variable entanglement is a key resource in many applications of quantum information and quantum computation theory. We theoretically investigate a single atom trapped inside a doubly resonant cavity as a source of entanglement in macroscopic light. The four-level gain medium atom interacts with two (nondegenerate) cavity modes on separate transitions, while the two other transitions are driven by control laser fields. Spontaneous decay of the atomic levels as well as cavity losses are included in our model. We employ an inequality [1] based on the correlation of the field operators as a sufficient criterion for the entanglement of the cavity field. It is shown that the considered two-mode single-atom laser gives rise to an entangled state of the cavity modes with a macroscopic number of photons over a wide range of control parameters and initial states of the cavity field [2].
[1] L.-M. Duan, G. Giedke, J. I. Cirac, and P. Zoller, Phys. Rev. Lett. 84, 2722 (2000).
[2] M. Kiffner, M. S. Zubairy, J. Evers, and C. H. Keitel, Phys. Rev. A 75, 033816 (2007).