# Stuttgart 2012 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 9: Quanteneffekte: Interferenz und Korrelationen

### Q 9.1: Vortrag

### Montag, 12. März 2012, 14:00–14:15, V7.01

**Superradiance from entangled atoms** — Ralph Wiegner^{1}, •Joachim von Zanthier^{1}, and Girish Agarwal^{2} — ^{1}Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Erlangen — ^{2}Department 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 [1]. 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.

[1] R. Wiegner, J. von Zanthier, and G. S. Agarwal, Phys. Rev A 84, 023805 (2011).