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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster: Quantum Optics and Photonics II

Q 41.32: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

Spectral characterization of a entangled photon pair source for QKD — •Daniel Hofmann, Erik Fitzke, Oleg Nikiforov, and Thomas Walther — AG Laser und Quantenoptik, Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany

We are developing a quantum key distribution system with energy-time entangled photon pairs. Our system enables quantum-secure communication in real-world standard telecommunication networks. In order to achieve stable operation under realistic environmental conditions, the influence of the transmission through several kilometers of real telecommunication-fiber on the photons needs to be investigated and the quantum bits need to be characterized.

Thus, we developed tools to be applied outside of a controlled laboratory environment. We present a method for the spectral characterization of the photons based on chromatic dispersion in a fiber in combination with measurement of the arrival time of photons. We compare the results to measurements conducted by other techniques such as using a spectrograph or a Hong-Ou-Mandel interferometer.