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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Focus: Whispering-Gallery-Mode Resonators

KFM 4.8: Vortrag

Montag, 1. April 2019, 12:30–12:50, H47

Single photon generation in a whispering gallery mode resonator — •Golnoush Shafiee^1,2, Florian Sedlmeir^1,2, Gerhard Schunk^1,2, Alexander Otterpohl^1,2, Ulrich Vogl^1,2, Dmitry Strekalov^1,2, Harald G. L. Schwefel^3,4, Gerd Leuchs^1,2, and Christoph Marquardt^1,2 — ¹MPL, Erlangen, Germany — ²FAU, Erlangen, Germany — ³University of Otago, Dunedin, New Zealand — ⁴Dodd-Walls Centre for Photonic and Quantum Technologies, New Zealand

A whispering gallery resonator (WGR) is a versatile source of tunable, narrow-band and efficient single photons which can be used for quantum information processing [1,2,3]. Our WGR is made of nonlinear lithium niobate and its working principle is based on spontaneous parametric down-conversion where a pump photon decays into two cavity modes of different wavelengths named signal and idler. Here, we investigate parametric down-conversion in counter-propagating modes of one WGR. The interference of two photons from different propagation directions opens up the possibility of generating polarization-entangled states using only one resonator. A source of polarization-entangled states can greatly enhance the success rates of the proposed quantum repeaters. [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).