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Q: Fachverband Quantenoptik und Photonik
Q 18: Quanteninformation: Photonen I
Q 18.8: Vortrag
Dienstag, 3. März 2009, 12:15–12:30, VMP 6 HS-D
A bright source of indistinguishable triggered single photons — •Yves Rezus, Robert Lettow, Alois Renn, Stephan Götzinger, and Vahid Sandoghdar — ETH Zürich, Laboratory of Physical Chemistry (LPC), 8093 Zürich, Switzerland
At cryogenic temperatures (<2 K) single fluorescent dye molecules embedded in an organic matrix display a number of interesting properties, which make them ideally suited to be used as single photon sources for quantum optical experiments. These properties include a quantum yield of nearly 100 %, a lifetime-limited optical linewidth and an almost infinite photo-stability. We demonstrate that by using pulsed laser excitation it is possible to create a triggered stream of bandwidth-limited single photons with a brightness exceeding 106 cps. By using the Stark effect we are able to shift the emission frequency of our single photon source and bring it into resonance with a second molecule, which is located in a different cryostat. This makes it possible to produce indistinguishable photons using two independent sources. We discuss the possibilities of employing these indistinguishable photons in two-photon interference experiments. Finally we discuss an experiment in which single photons are channeled from one molecule to a second, thereby using one of the molecules as a source and the second as a detector. This effectively provides a scheme for coupling two single molecules that are separated by a macroscopic distance.