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TUE: Tuesday Contributed Sessions
TUE 11: Quantum Optics and Quantum Computation
TUE 11.5: Talk
Tuesday, September 9, 2025, 15:15–15:30, ZHG104
Measuring nuclear resonant phase shifts with a nanoscale double-slit experiment — •Leon Merten Lohse1,3, Ralf Röhlsberger4,5,6,3, and Tim Salditt2 — 1Universität Hamburg — 2Georg-August-Universität Göttingen — 3Deutsches Elektronen-Synchrotron DESY, Hamburg — 4Friedrich-Schiller-Universität Jena — 5Helmholtz-Institut Jena — 6GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
An electromagnetic wave scattering with atoms experiences a phase shift that encodes information about the atoms’ quantum states and photon-matter interaction. While interferometers are readily available in the optical regime, measuring phase shifts in the x-ray regime is notoriously challenging, especially at the nanometer scale. To that end, we have devised and implemented a double-waveguide interferometer on the nanometer scale, reminiscent of Thomas Young’s celebrated experiment from 1801. The interferometer has enabled us to measure the phase shift that an ultrathin layer of 57Fe Mössbauer nuclei coherently imprints onto x-ray photons propagating through a single-mode x-ray waveguide. Using the extracted phase shift, we were able to accurately quantify the coupling strength between photons and nuclei. Based on this, one can envision to actively control the phase in x-ray nanophotonic devices.
Keywords: Double-slit experiment; nuclear resonances; waveguides; x-ray; interferometer