Coherent control of single x-ray photons
Wednesday, 12 Sep. 2012, 14:00 - 15:00
Presenter: Adriana Palffy, Max Planck Institute for Nuclear Physics, Heidelberg, D
Host: Markus Aspelmeyer
Where: Schrödingerroom, Faculty of Physics, Boltzmanngasse 5, 4th floor, 1090 Wien
Abstract: Resonant scattering of light off nuclei in a crystal may lead under certain conditions to the formation of a collective nuclear excitation, often denoted as nuclear exciton. The coherent light reemission is then determined by collective effects and is superradiant in nature. Fast rotations of the direction of the magnetic hyperfine fields have been experimentally used to control and even completely suppress the coherent decay channel via destructive interference effects. Applications of this technique to achieve x-ray single photon entanglement or control the branching ratio of specific nuclear transitions are proposed. Furthermore, we investigate theoretically the coherent storage and phase modulation of x-ray single-photon wave packets in resonant scattering of light off nuclei. We show that phase-sensitive storage of photons in the keV regime can be achieved by switching off and on again the magnetic field in the nuclear sample. The development of such x-ray single-photon control techniques is a first step towards forwarding quantum optics and quantum information to shorter wavelengths and more compact photonic devices.