AMO Seminar

Title: Collective dynamics in interacting systems of quantum emitters

Speaker: Claudiu Genes, Institute for Theoretical Physics (University of Innsbruck) and Max Plank Institute for the Science of Light (Erlangen)

Abstract:

Time evolution in ensembles of quantum emitters (atoms, molecules, ions, Rydberg atoms, quantum dots etc) at low vs. high densities is fundamentally different. As particles get closer together, strong environment-mediated interactions start playing a large role both in the coherent (such as dipole-dipole interactions) as well as in the incoherent evolution (super- /subradiance).

We aim at exploiting the inherent collective dynamics towards a few goals such as: i) to perform more precise frequency measurements in the context of Ramsey interferometry in the presence of dephasing and decay [1,2,4] and  ii) to selectively and efficiently prepare robust multipartite entangled states [3] .

References:

[1] Protected State Enhanced Quantum Metrology with Interacting Two-Level Ensembles, L. Ostermann, H. Ritsch and C. Genes, Phys. Rev. Lett. 111, 123601 (2013).

[2] Protected subspace Ramsey spectroscopy, L. Ostermann, D. Plankensteiner, H. Ritsch, and C. Genes, Phys. Rev. A 90, 053823 (2014)

[3] Selective protected state preparation of coupled dissipative quantum emitters, D. Plankensteiner, L. Ostermann, H. Ritsch, and C. Genes, Sci. Reps 5, 16231 (2015).

[4] Laser noise imposed limitations of ensemble quantum metrology,  D. Plankensteiner, J. Schachenmayer, H. Ritsch, and C. Genes, arxiv:1605.00874 (2016).

Coffee/tea and bread rolls will be served at 10:00