Stuttgart 2012 – wissenschaftliches Programm
Q 9.1: Vortrag
Montag, 12. März 2012, 14:00–14:15, V7.01
Superradiance from entangled atoms — Ralph Wiegner1, •Joachim von Zanthier1, and Girish Agarwal2 — 1Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Erlangen — 2Department of Physics, Oklahoma State University, Stillwater, USA
The progress in the preparation of entangled emitters, particularly in chains of trapped ions, opens the way to investigate new aspects of optics. For example, one could ask how the radiative properties of atoms in entangled states differ from those of atoms prepared in separable states. We consider a system of N independent atoms with an interatomic distance much larger than the emission wavelength prepared in well characterized entangled states and discuss their far-field radiation pattern. We show that the entangled state displays enhanced spontaneous emission and trace this enhancement back to interferences of multiple photon quantum path ways . This framework is especially useful as separable initially excited states obviously do not display interferences at the level of the mean radiated intensity as their dipole moment is zero. The considered entangled states have also zero dipole moment. However the quantum path framework which is not based on the dipole moment can physically explain the enhanced radiation where a classical antenna interpretation is not applicable.
 R. Wiegner, J. von Zanthier, and G. S. Agarwal, Phys. Rev A 84, 023805 (2011).