Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interferometric phase detection at x-ray energies via Fano resonance
  control   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.

21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th