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Q: Fachverband Quantenoptik und Photonik

Q 4: Photonics I

Q 4.6: Vortrag

Montag, 29. Februar 2016, 12:15–12:30, f342

Coherent single photon frequency conversion for long distance quantum networks — •Tim Kroh¹, Andreas Ahlrichs¹, Otto Dietz¹, Andreas W. Schell², Benjamin Sprenger¹, and Oliver Benson¹ — ¹1Department of Physics, Humboldt-Universität zu Berlin, Germany — ²Department of Electronic Science and Engineering, Kyoto University, Japan

For long-distance quantum cryptographic communication it is convenient to use the existing fiber optical network to transmit single flying quantum bits - that are photons. The concept of a quantum repeater enables the establishment of a quantum communication channel even beyond the absorption limit of less than 100 km for single photon transmission by the successive transfer of entanglement over the whole distance while the participating photons will only travel a small fraction.

To set up a quantum information network using quantum repeaters different building blocks such as quantum gates, memories and sources of entangled photons are required. Bright sources of high quality indistinguishable photons only exist so far at shorter wavelengths, e.g. single quantum dots or a spontaneous parametric process in a nonlinear crystal. We tackle that problem by coherently converting the frequency of single photons emitted by these two sources into the telecom band. Recent results will be presented that demonstrate the preservation of non-classical temporal properties of quantum correlated photon pairs.