European XFEL Science Seminar

# "When X-rays go Quantum: New Perspectives for Spectroscopy and Imaging"

## by Ralf Röhlsberger (DESY)

Tuesday, May 8, 2018 from to (Europe/Berlin)
at Campus Schenefeld, XHQ ( E1.173 )
 Description In recent years we have witnessed the transfer of concepts in quantum and nonlinear optics into the regime of hard X-rays. A particular role in this field has been taken by the ultrasharp resonances of Mössbauer isotopes as almost ideal two-level systems to explore quantum optical concepts. In the first part of my talk I will review recent developments in nuclear quantum optics and give a perspective on future applications at synchrotrons and X-ray lasers sources. Another boost in this field has been initiated by applying the quantum theory of optical coherence to the X-ray regime. We have shown recently that intensity correlations within incoherently scattered radiation can be used for imaging applications with radiation from free-electron lasers. The methods promises atomic-resolution images by using fluorescence radiation emitted from metal atoms in biomolecules, for example.