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Q: Fachverband Quantenoptik und Photonik

Q 40: Quanteneffekte: Interferenz und Korrelationen II

Q 40.6: Talk

Wednesday, March 4, 2009, 17:45–18:00, VMP 6 HS-E

Investigation of spatial correlation of biphotons using a blazed grating — •Dirk Puhlmann and Martin Ostermeyer — Institut of Physics and Astronomy, University of Potsdam, Potsdam, Germany

Correlations between photons can be exploited for resolution improvements in different methods of quantum imaging. Since Fock-states of N-photons of wavelength λ propagate through phase shifts N-times faster as coherent states they can appear as if they had a de Broglie wavelength of λ/N. This can be observed e.g. in diffraction experiments of biphotons at conventional gratings.

Using a blazed grating, different number states could be separated or sorted on the one hand. On the other hand evaluation of the diffraction pattern by the one-photon and two-photon rate allows for an analysis of the spatial correlation between correlated photons. An experimental demonstration of these ideas tested for a biphoton beam will be presented. A comparison to calculated diffraction patterns is carried out. Fraunhofer diffraction patterns for two-photon and one-photon detection were calculated and analyzed using a Fourier-optical approach [1].

[1] Shimizu, R., Edamatsu, K. & Itoh, Phys. Rev. A 74, 013801-10(2006).