Hannover 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 17: Quantum effects: Interference and correlations
Q 17.1: Gruppenbericht
Montag, 18. März 2013, 16:30–17:00, F 342
Two-photon interference and complementarity with bright twin beams — Dirk Puhlmann, Axel Heuer, •Carsten Henkel, and Ralf Menzel — Institute of Physics and Astronomy, Universität Potsdam
We discuss experiments performed with bright twin beams produced by spontaneous parametric down-conversion (SPDC) from pump beams in different spatial modes. Two-photon interferences are observed both in polarization and spatially, inserting a Mach-Zehnder interferometer in the signal beam. Our setups are designed to favor conditions where the single-photon signal shows no contrast because Welcher Weg information is available from the idler photon [1, 2]. In the case of a pump mode of odd symmetry (TEM01), we have observed double-slit interference in a mixed coincidence signal (signal far-field, idler near-field), although the strong position correlation in near-near coincidences suggests that the idler carries Welcher Weg information [3]. The interpretation of these results touches upon complementarity, nonlocality in delayed-choice experiments [4], and our understanding of two-photon quantum mechanics [5].
[1] T. J. Herzog & al, Phys. Rev. Lett. 75 (1995) 3034
[2] B.-G. Englert, Phys. Rev. Lett. 77 (1996) 2154
[3] R. Menzel, D. Puhlmann, A. Heuer, and W. P. Schleich, Proc. Natl. Acad. Sci. USA 109 (2012) 9314
[4] A. Peruzzo & al, Science 338 (2012) 634; F. Kaiser & al, Science 338 (2012) 63
[5] M. H. Rubin, & al, Phys. Rev. A 50 (1994) 5122