Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantum Repeater and Quantum Communication
Q 17.8: Vortrag
Dienstag, 7. März 2017, 12:45–13:00, P 3
Towards two-photon interference with a whispering gallery photon pair source — •Gerhard Schunk1, Golnoush Shafiee1, Ulrich Vogl1, Dmitry Strekalov1, Alexander Otterpohl1, Florian Sedlmeir1, Harald G. L. Schwefel1,2, Gerd Leuchs1, and Christoph Marquardt1 — 1Max Planck Institute for the Science of Light, Institute for Optics, Information and Photonics, University Erlangen-Nuremberg, Erlangen, Germany — 2The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, Dunedin, New Zealand
Single photons and photon pairs are an important resource for quantum information processing. We use parametric down-conversion (PDC) in a whispering-gallery resonator (WGR) made of lithium niobate to generate photon pairs [1] and squeezed light [2]. Single-mode operation of this source has been shown [4]. We recently demonstrated coupling of heralded single photons with MHz-bandwidth to different atomic transitions in the near-infrared [4,5].
Currently, we investigate PDC in counter-propagating modes of one WGR. Here we study interference of the counter-propagating signals above and below the oscillation threshold. This system opens up novel possibilities for the creation of polarization-entangled photon pairs for 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] M. Förtsch et al., Phys. Rev. A 91, 023812 (2015). [4] G. Schunk et al., Optica 2, 773 (2015). [5] G. Schunk et al., J. Mod. Opt. 63, 2058 (2016)