SAMOP 2021 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Effects

Q 17.1: Poster

Thursday, September 23, 2021, 16:30–18:30, P

Inverse design of artificial two-level systems with Mössbauer nuclei in thin-film cavities — •Oliver Diekmann, Dominik Lentrodt, and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

We theoretically investigate the platform of Mössbauer nuclei in thin-film cavities for applications in x-ray quantum optics. Thin-film cavities are stacks of layers of different materials. One or several of the layers consist of a Mössbauer isotope (typically Fe57), i.e. the nuclei within this layer have a spectrally very narrow nuclear transition. At low probing intensities, the nuclei-cavity system is equivalent to a quantum few-level scheme, e.g. a single, thin layer of Mössbauer nuclei in the cavity forms an artificial two-level system (TLS) whose transition frequency and decay constant we can tune by e.g. modifying the surrounding cavity. The capabilities of the platform have already been hinted in a number of experiments.

While it is possible to ab initio calculate the quantum optical system simulated by a cavity structure, the inverse problem of finding the cavity structure to realize a desired level scheme is an open problem. Using a quantum optical framework based on the electromagnetic Green function, we could recently solve this problem for the TLS case, and determined its full tuning capabilities while taking into account practical considerations. The approach will also allow for extensions to multi-level schemes, otherwise inaccessible at hard x-ray energies, and, thus, promises to further the field of x-ray quantum optics towards applications in spectroscopy and x-ray based quantum technologies.