Hamburg 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.36: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Experimental Higher Dimensional Entanglement — •Daniel L. Richart1, 2, Witlef Wieczorek1,2, and Harald Weinfurter1,2 — 1MPI für Quantenoptik, Hans Kopfermannstr. 1, 85748 Garching — 2Ludwig-Maximilians-Universität, Schellingstr. 4, D-80797 München, Germany
Higher dimensional states (qudits) allow to implement quantum communication schemes of increasing complexity, as e.g. superdense coding. Similarly, qudits allow further research into the fundaments of quantum theory.
Here we report on first steps towards the implementation of states with correlated photon pairs in a 2x8 dimensional Hilbert space. To this end the photon pairs are prepared in the energy-time basis, as initially proposed in [1]:
Using unbalanced interferometers, information can be encoded in the different arrival times of the photon pairs, early and late, as was experimentally realized in [2]. Here, we extend this scheme by proposing and characterizing a scalable multiple time delay interferometer. This interferometer system allows an exponential increase in the dimensionality of the entangled state with only a linear increase in the optical components used.
Using the proposed interferometer system, first experimental tests on a two-dimensional state yielded a violation of a Bell inequality by four standard deviations.
J. D. Franson, Phys. Rev. Lett. 62, 2205 (1989); [2] W. Tittel et al., Phys. Rev. A 57, 3229 (1998)