Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 5: Quantum Optics I

Q 5.8: Vortrag

Montag, 29. Februar 2016, 12:45–13:00, f442

Quantum imaging via frustrated two photon generation — •Axel Heuer and Florian Krause — Experimentelle Quantenphysik, Institut für Physik und Astronomie, Universität Potsdam, D-14469 Potsdam, Germany

Recently, G. B. Lemos et al. [1] presented a quantum imaging setup which allows for image reconstruction using single photons which do not interact with the object. The basic concept of this imaging setup is induced coherence without stimulated emission between two separately pumped nonlinear down-conversion crystals. Here we introduce a related quantum imaging scheme based on frustrated two photon generation [2]. Our setup uses a single down-conversion crystal in conjunction with mirrors. The down converted signal and idler photons as well as the pump light are back-reflected into the crystal by three different mirrors, one for each beam. The arrangement allows for two indistinguishable paths, forwards and reflected beam, by which a photon pair can be created. If both paths are overlapped and the time delays are equal, the interference between these alternative ways produces suppression or enhancement of the pair creation. This interference can be detected in coincidence as well as a single photon signal with one detector only. Imaging is achieved by placing an object in the return path of either the signal or the idler photons.

[1] G. B. Lemos,V. Borish, G. D. Cole, S. Ramelow, R. Lapkiewicz and A. Zeilinger, Nature (London) 512, 409 (2014).

[2] T. J. Herzog, J.G. Rarity, H. Weinfurter and A. Zeilinger , PRL 72, 629 (1994)