Theoretical Physics

20 February 2013
Time: 15:00 to 16:00
Location: Room 8.90

Joerg Evers (Heidelberg)

X-ray quantum optics

Ideas from quantum optics based on coherence and interference have proven
extremely successful for the study and manipulation of atoms and
molecules, and this success heavily relies on the availability of suitable
light sources. Naturally, upcoming novel coherent x-ray light sources
prompt the question whether similar techniques could also be applied
beyond atoms and molecules.
Motivated by this, I will review recent theoretical and experimental
progress in the deveopment of nuclear quantum optics with hard x-rays. In
particular, I will discuss the manipulation of single x-ray photons, e.g.,
to generate entanglement.  I will then focus on the engineering of
advanced nuclear multi-level schemes in experimentally relevant settings.
These are a basic requirement for the exploration of nonlinear and quantum
effects with nuclei. As main example, I will consider so-called
spontaneously generated coherences. Because of their fascinating
properties, they have been suggested in numerous theoretical works for a
multitude of applications. But stringent conditions on the level scheme so
far hindered an experimental implementation. I will explain how nuclei
embedded in a thin film cavity probed with x-rays in grazing incidence
allow to directly observe SGC, and discuss recent experimental results.



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