Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 79: Quantum dots and wires IV

HL 79.1: Vortrag

Freitag, 20. März 2020, 09:30–09:45, POT 151

Controlling entanglement in different realms — •Kisa Barkemeyer1, Samir Bounouar2, Stephan Reitzenstein2, Andreas Knorr1, and Alexander Carmele11Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Entanglement lies at the heart of many applications in the field of quantum information processing. As a platform for their implementation, photonic degrees of freedom are promising candidates. Thus, the ability to efficiently control and tailor quantum optical properties is a central goal.

Photon pairs entangled in their polarization degrees of freedom are, for example, generated in a quantum dot biexciton cascade. We study how the measured degree of entanglement is influenced by the properties of the quantum dot as well as by the measurement setup itself [1]. For this system, it is possible to control the entanglement properties using coherent time-delayed feedback [2]. We aim to extend this scheme to a new realm by focussing on energy-time entanglement inspired by the paradigmatic Franson interferometer [3].

[1] S. Bounouar et al., manuscript in preparation.

[2] K. Barkemeyer, R. Finsterhölzl, A. Knorr, and A. Carmele, Adv.

 Quantum Technol. 1900078 (2019).

[3] J. D. Franson, Phys. Rev. Lett. 62, 2205 (1989).

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