Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics III

Q 42.37: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Two-photon interference with a non-degenerate photon-pair source — Gerhard Schunk, •Golnoush Shafiee, Ulrich Vogl, Dmitry Strekalov, Alexander Otterpohl, Navid Soltani, Florian Sedlmeir, Harald G. L. Schwefel, Gerd Leuchs, and Christoph Marquardt — Max Planck Institute for the Science of Light, Institute for Optics, Information and Photonics, University Erlangen-Nuremberg, Erlangen, Germany

Single photons and photon pairs are an important resource for quantum information processing. Our compact source of photon pairs [1] and squeezed light [2] is based on spontaneous parametric down conversion (SPDC) in a triply resonant whispering-gallery resonator (WGR) made of lithium niobate. Single-mode operation of this source has been shown. We recently demonstrated the tuning of our SPDC source to different narrowband atomic transitions in the near-infrared, which makes our source compatible with a wide range of atomic quantum memories [3].

We currently investigate SPDC in counter-propagating modes in one WGR, which can be viewed as two identical photon-pair sources. Here we study entanglement creation via the interference of two heralded signal photons. This system opens up novel possibilities to realize proposed quantum repeater schemes.

[1] M. Förtsch et al., Nat. Commun. 4, 1818 (2013). [2] J. U. Fürst et al., Phys. Rev. Lett. 106, 113901(2011). [3] G. Schunk et al., Optica 2, 773-778 (2015).