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Q: Fachverband Quantenoptik und Photonik
Q 16: Quanteneffekte (Interferenz und Korrelationen)
Q 16.3: Talk
Monday, March 19, 2007, 17:00–17:15, 5E
Two-Photon Optics — •Daniel Schlenk1 and Harald Weinfurter1,2 — 1Department für Physik der LMU, Schellingstraße 4/III, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
The properties of imaging systems can be described by the point-spread function, which is determined by diffraction. A shorter wavelength results in a smaller diffraction pattern and therefore allows (in principle) a better resolution. It has been shown [1,2,3] that entangled n-photon states offer diffraction effects of the wavelength divided by n, if a n-photon detection is performed.
Here we use this feature to enhance the resolution of an imaging system. An image of the biphotons (signal and idler) created in a type I collinear down conversion is formed by a lens, and recorded by scanning a single mode fiber through the image plane and detecting pairs of photons (coincidences) behind a beam splitter with avalanche photodiodes. The point-spread function of the biphotons was by a factor of 1.7 smaller than the one of single photons.
[1] Ph. Walther et al., Nature 429, 158 (2004)
[2] M. W. Mitchell et al., Nature 429, 161 (2004)
[3] M. C. Teich and B. A. E. Saleh, Cesk. Cas. Fyz 47, 3-8 (1997)