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Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 20: Symposium: Single Photon Sources and Spectroscopy of Individual Quantum Systems

HL 20.2: Talk

Saturday, March 5, 2005, 11:15–11:45, TU P270

Solid-state single-photon-sources for quantum cryptography — •H. Weinfurter1, Ch. Wang1, Ch. Braig1, P. Zarda1, and Ch. Kurtsiefer21Department für Physik, Ludwig-Maximilians-Universität, D-80799 München — 2Department of Physics, National University of Singapore, Singapore 117542, Singapore

Color centers in diamond turned out to be simple and reliable sources of single photons. Based on confocal microscope set-up, these sources can be operated at room-temperature without any sign of bleaching. For example the N-V (nitrogen-vacancy) center was already used in experiments on the complementarity principle and for quantum cryptography. Its disadvantages, in particular the broad emission spectrum, can be avoided when using different centers studied more recently. The talk introduces the method of creating single photons and gives an overview of experiments applying these novel sources.

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