Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 1: Whispering Gallery Mode Resonators I
KFM 1.7: Vortrag
Montag, 12. März 2018, 12:10–12:30, EMH 025
Single photon generation in a whispering gallery mode resonator — •Golnoush Shafiee1,2, Gerhard Schunk1,2, Florian Sedlmeir1,2, Alexander Otterpohl1,2, Ulrich Vogl1,2, Dmitry Strekalov1,2, Harald G. L. Schwefel3, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1MPL, Erlangen, Germany — 2FAU, Erlangen, Germany — 3University of Otago, Dunedin, New Zealand
Single photons are an important resource for quantum information processing since they are reliable long distance carriers for quantum information. The generation of high quality single photons with controllable narrow spectral bandwidths and central frequencies is key to facilitate efficient coupling of any atomic system to non-classical light fields. Here, we report on a fully tunable, narrow band and efficient source of non-classical light, in particular single photons [1,2], based on a crystalline whispering gallery mode resonator. It is made of lithium niobate and works based on spontaneous parametric down-conversion where a pump photon decays due to material nonlinearties into two single cavity modes of different wavelengths. The central wavelength of the emitted light can be tuned over hundreds of nanometers [3].
Currently, we are working on generating polarization entangled photon states with our compact and monolithic source, which opens up novel possibilities for creating the central building block 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] G. Schunk et al., Optica 2, 773-778 (2015).