Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 25: Nano-Optics I

Q 25.3: Talk

Tuesday, March 1, 2016, 15:00–15:15, f342

Probing non-Markovian dephasing processes in deterministic quantum-dot microlenses — •Alexander Thoma¹, Peter Schnauber¹, Manuel Gschrey¹, Marc Seifried¹, Janik Wolters¹, Jan-Hindrik Schulze¹, André Strittmatter¹, Sven Rodt¹, Alexander Carmele², Andreas Knorr², Tobias Heindel¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, TU Berlin, Berlin, Germany — ²Institut für Theoretische Physik, TU Berlin, Berlin, Germany

Bright quantum light sources based on single semiconductor quantum dots (QDs) integrated into photonic microstructures are key building blocks for the realization of advanced quantum computation schemes. Further progress toward applications will rely on deterministic fabrication technologies. Despite practical aspects, a profound knowledge of decoherence processes affecting the photon-indistinguishability is crucial for any optimization of future devices. Here, we probe time-dependent dephasing processes in deterministic QD-microlenses [1]. In particular, we explore the photon-indistinguishability as a function of the time δt elapsed between consecutive photon emission events to gain experimental access to the underlying decoherence processes at a ns time-scale. Gradually increasing δt from 2 ns to 12 ns results in a plateau-like behaviour at low δt with visibilities close to unity, while the visibility decreases for larger δt (> 8 ns). Our experimental observations are theoretically described by a non-Markovian noise process in agreement with fluctuating charge carriers in the QD’s vicinity.

[1] Thoma et. al, arXiv:1507.05900 (2015)