Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)

TT 56.6: Talk

Wednesday, March 14, 2018, 11:00–11:15, EW 201

Quantum emitter coupled to photonic modes: superradiant to subradiant phasetransition generates a dark state cascade — Michael Gegg, Alexander Carmele, Andreas Knorr, and •Marten Richter — Institut für Theoretische Physik, Technische Universität Berlin, Germany

If an ensemble of quantum emitter like quantum dots, NV centers or atom are coupled to photonic or plasmonic modes, collective effects can lead to collective super- or subradiance. Here, we discuss a type of phase transition, that describes the transition from predominantly superradiant states to subradiant states with applications to quantum information storage. The simulation for a large number of two level systems is made possible by a method exploiting the permutation symmetry for identical system [1,2] available through the library PsiQuaSP [3]. In the described situation the important quantity for the generation of the subradiant states is the cavity decay and not the individual quantum emitter decay. Experimental signatures as well as entanglement properties are discussed.

[1] Phys. Rev. B 91, 035306 (2015)

[2] New J. Phys. 18, 043037 (2016)

[3] Sci. Rep. 7, 16304 (2017)

[4] New J. Phys. (in press), (2017), https://doi.org/10.1088/1367-2630/aa9cdd, arXiv:1705.02889