Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 14: Interaction with VUV and X-ray light III

A 14.5: Talk

Friday, March 18, 2011, 12:00–12:15, BAR 106

Excitons, polaritons and entanglement with x-ray light — •Adriana Pálffy, Christoph H. Keitel, and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Resonant scattering of monochromatized synchrotron radiation off nuclei can lead to an excitation in the nuclear ensemble that is of excitonic nature such that collective effects determine the coherent reemission. It has been shown experimentally [1] that switching abruptly the direction of the magnetic hyperfine fields can control and even completely suppress the coherent decay channel due to destructive interference.

Based on this switching technique, we investigate more advanced coherent control schemes and show that the accelerated nuclear forward scattering allows for the generation of two correlated coherent decay pulses out of one excitation, providing single-photon entanglement in the keV regime [2]. With a proper choice of switching parameters, specific transitions between hyperfine levels can be restored thus controlling the polarization of the emitted x-ray light [3]. Furthermore, suppression of the coherent decay in resonant x-ray scattering can be used to control the cooperative branching ratio in nuclear systems, and thus the population of nuclear states [4]. Prospects for the population of metastable nuclear states are discussed.

[1] Y. V. Shvyd’ko et al., Phys. Rev. Lett. 77, 3232 (1995)

[2] A. Pálffy, C. H. Keitel and J. Evers, Phys. Rev. Lett. 103, 017401 (2009)

[3] A. Pálffy and J. Evers, J. Mod. Opt. 57, 1993 (2010)

[4] A. Pálffy, C. H. Keitel and J. Evers, arXiv:1010.5134