TY  - JOUR
AU  - Heeg, K. P.
AU  - Ott, C.
AU  - Schumacher, D.
AU  - Wille, H.-C.
AU  - Röhlsberger, R.
AU  - Pfeifer, T.
AU  - Evers, J.
TI  - Interferometric Phase Detection at X-Ray Energies via Fano Resonance Control
JO  - Physical review letters
VL  - 114
IS  - 20
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - PUBDB-2015-02104
SP  - 207401
PY  - 2015
AB  - 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. The nuclei are initially prepared in a superposition state. Subsequently, the relative phase of this superposition is interferometrically reconstructed from the emitted x rays. Our results form a first step towards x-ray quantum state tomography and provide new avenues for structure determination and precision metrology via x-ray Fano interference.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000354969900009
C6  - pmid:26047250
DO  - DOI:10.1103/PhysRevLett.114.207401
UR  - https://bib-pubdb1.desy.de/record/220110
ER  -