Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Effects: Interference and Correlations II / Entanglement and Decoherence I

Q 8.6: Talk

Monday, March 8, 2010, 18:00–18:15, A 310

Quantum entanglement in dense multiparticle samples — •Mihai Macovei, Joerg Evers, and Christoph H. Keitel — Max-Planck-Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany

The existence of entanglement in multi-particle samples is an important fundamental problem. Here, we discuss the pairwise entanglement of atoms randomly extracted from a laser-driven dense multi-particle sample [1]. Our model includes a control laser field as well as quantum dissipation due to spontaneous emission. We find that the dipole-dipole interaction between the particles shifts the laser-qubit resonance frequency and consequently modifies the quantum entanglement. By means of an appropriate tuning of the laser frequency, one can optimize the entanglement in this system. For large ensembles, the maximum entanglement occurs near the laser parameters where the steady-state sample exhibits phase transition phenomena.

[1] M. Macovei, J. Evers, C. H. Keitel, arXiv:0911.1223v1 [quant-ph].