Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics IV
Q 58.6: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Decay properties of an atom coupled to a disordered 1D waveguide — •Michael P. Schneider1, Christoph Martens1, Tobias Sproll1, and Kurt Busch1,2 — 1Max-Born-Institut, Max-Born-Str. 2A, 12489 Berlin, Germany — 2Humboldt-Universität zu Berlin, Institut für Physik, AG Theoretische Optik & Photonik, Newtonstr. 15, 12489 Berlin
Single atoms coupled to one-dimensional (1D) waveguides are systems that are experiencing growing interest over the last years. They can be thought of as building blocks for quantum networks, where the entanglement between the atoms is distributed by means of single photons. These systems can be combined with structured waveguides, which exhibit a nonlinear dispersion relation, including band edges. In this case, the coupled atom-waveguide system supports an atom-photon bound state in the band gap. This is a polaritonic eigenstate of the system, which can be used for example to trap light.
We analyze the decay properties of a two-level system (TLS) coupled to a 1D waveguide with (fabricational) disorder. With the help of disorder-averaged Green’s functions, also backed up by numerical calculations, we find that the atom-photon bound state is unstable for large enough disorder. Within the framework of a newly developed formalism we associate this effect to the disorder-induced smearing of the waveguides density of states. Additionally, we identify a special set of diagrams which are dominant for energies far away from the band edge. These diagrams introduce a new timescale in the decay process and thus render the system non-Markovian.