Quantum Cryptography


In the past quantum mechanics has helped us deepen our understanding of the microscopic world and has made a multitude of new and exciting progress possible. Examples for these developments are the laser, superconductivity, and ferro-magnetism just to name a few.

Recently the ability to prepare and control quantum systems has rapidly evolved. For the first time, true applications of quantum mechanics are feasible, i.e. applications based on specific quantum mechanical features such as entanglement and superposition. The overall field of quantum information processing has emerged. This entails topics such as quantum teleportation, quantum computing and quantum cryptography.


The immediate goal of these experiments is the setup of a quantum key distribution system based on the BB84 protocol. We plan to use a heralded single photon source based on spontaneous parametric down-conversion in PPKTP wave guides.

References and Links


Prof. Dr. Thomas Walther

Laser und Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
D-64289 Darmstadt

+49 6151 16-20831 (Sekretariat)

+49 6151 16-20834 (Fax)




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