# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 15: Poster: Quantum Optics and Photonics I

### Q 15.77: Poster

### Montag, 23. März 2015, 17:00–19:00, C/Foyer

**gravitational and special-relativistic actions on x-ray superradiance** — •wen-te liao^{1,2,3} and sven ahrens^{1,4} — ^{1}Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany — ^{2}Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany — ^{3}Center for Free Electron Laser Science, 22607 Hamburg, Germany — ^{4}Beijing Computational Science Research Center, 100084 Beijing, China

Einstein’s theories of relativity can be verified also in quantum systems, for example by using atomic clocks at high speeds. Such experiments offer a deeper understanding of the underlying physical phenomena. However, many challenges still remain on finding novel methods for detecting effects of gravity and of special relativity and their roles in light-matter interaction. Here we introduce a scheme of x-ray quantum optics that allows for a millimeter-scale investigation of the relativistic redshift by means of nuclei embedded in a crystal matrix. The nuclear crystal can be probed by x-rays while being held fixed in Earth’s gravitational field. Alternatively, a compact rotating nuclear crystal can be used to force the interacting x-rays to experience inhomogeneous clock tick rates throughout the sample. We find that an association of gravitational or special-relativistic time dilation with quantum interference will manifest via measurable deflections of x-ray photons [1]. Our protocol suggests a new and feasible tabletop solution for probing effects of gravity and special relativity in the quantum world.

[1] W.-T. Liao and S.Ahrens, arXiv:1411.7634 (2014).