Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 38: Interaction with VUV and X-ray light II
A 38.1: Hauptvortrag
Freitag, 27. März 2015, 11:00–11:30, C/HSW
X-ray quantum optics: From Mössbauer to Fano — Kilian P. Heeg1, Christian Ott1, Daniel Schumacher2, Hans-Christian Wille2, Ralf Röhlsberger2, Thomas Pfeifer1, and •Jörg Evers1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Deutsches Elektronen-Synchrotron DESY, Hamburg
Modern x-ray light sources promise access to structure and dynamics of matter in largely unexplored spectral regions. However, the desired information is encoded in the light intensity and phase, whereas detectors register only the intensity. This phase problem is ubiquitous in crystallography and imaging, and impedes the exploration of quantum effects at x-ray energies. Here, we demonstrate phase-sensitive measurements characterizing the quantum state of a nuclear two-level system at hard x-ray energies [1]. This system comprises a large ensemble of nuclei in a x-ray cavity. The nuclei are initially prepared in a superposition state via a short x-ray pulse. Subsequently, the relative phase of this superposition is interferometrically reconstructed from the emitted x-rays via the cavity. Next to phase-sensitive measurements, also control of spectroscopic line shapes at hard x-ray energies is enabled via the tunable Fano interference [2].
[1] K. P. Heeg et al., arXiv:1411.1545 [quant-ph]
[2] C. Ott et al., Science 340, 716 (2013)