Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.66: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

X-ray cavity QED beyond the input-output formalism — •Dominik Lentrodt, Kilian P. Heeg, Christoph H. Keitel, and Jörg Evers — MPI für Kernphysik, Heidelberg

The input-output formalism has been one of the main theoretical models in cavity QED, since it allows to describe the atom-cavity dynamics in terms of a few constants, such as resonance energies and decay time scales of the cavity. This is invaluable in understanding the mechanisms behind experimental results, since the constants can be fitted to data. However, in particular in the bad cavity regime or when multiple cavity modes are involved in the dynamics, this method does not always yield a unique explanation of the underlying processes. Indeed the use of input-output formalism for loss-dominated cavities has been debated theoretically and spectroscopic experiments using x-ray cavities doped with Mössbauer nuclei have shown that heuristic extensions to the input-output formalism, such as additional phase shifts, are required in order to successfully model collective Lamb shifts in the system [1,2].

We employ a recently developed method that links ab-initio quantisation to the input-output formalism to predict x-ray spectra in the nuclei-cavity system from the cavity geometry. Within this formalism, the additional phase shifts can now be understood as a multi-mode interference effect, enabled by crucial differences to standard assumptions in the input-output model approach. [1] Röhlsberger, R. et al. (2010). Science, 328, 1248-1251. [2] Heeg, K. P. & Evers, J. (2015). Phys. Rev. A, 91, 063803.