Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum information: Photons and nonclassical light III

Q 51.2: Talk

Thursday, March 20, 2014, 16:45–17:00, UDL HS3038

Characterisation of Spatial Correlations of PDC in Waveguide Arrays — •Regina Kruse, Fabian Katzschmann, Benjamin Brecht, Linda Sansoni, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Integrated optics form a compact, stable and flexible platform for the development of quantum information devices. Especially arrays of weakly coupled waveguides became the focus of attention in the context of continuous-time quantum walks [1,2]. Integrating the photon-pair generation into the quantum walk geometry allows for a flexible generation of highly complex photonic quantum states [2,3].

Here, we investigate the spatially resolved second-order correlation function of a parametric down-conversion process, integrated into a coupled waveguide array. We develop a theoretical framework to analyse spatial correlations and present a fully integrated, loss-independent correlation measurement scheme.

[1] A. Peruzzo et al., Science 329 (1500), 2010

[2] A. Solntsev et al., PRL 108 (023601), 2012

[3] R. Kruse et al., NJP 15 (083046), 2013