Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quanteninformation: Photonen und nichtklass. Licht

Q 12.1: Vortrag

Montag, 12. März 2012, 14:00–14:15, V7.02

Continuous-variable cluster state generation with cylindrical vector beams — •Stefan Berg-Johansen1,2, Ioannes Rigas1,2, Christian Gabriel1,2, Andrea Aiello1,2, Peter van Loock1,2, Christoph Marquardt1,2, and Gerd Leuchs1,21Max Planck Institute for the Science of Light, Erlangen, Germany — 2Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Germany

An intriguing property of cylindrically polarized beams of light is that their polarization and spatial degrees of freedom cannot be factorized even in a classical description. In the quantum treatment, this structural inseparability leads to spatial and polarization entanglement as well as entanglement between these two degrees of freedom when the beam is quadrature squeezed [1]. In this talk we present several schemes for the generation of four-node cluster states using such beams. A careful analysis of the properties of the resulting clusters reveals that cylindrically polarized modes are indeed well-suited for this purpose. We also report first steps towards the experimental realization of a cluster state. To this end, we generate amplitude squeezed radially and azimuthally polarized beams which form the backbone of our cluster state schemes. In a first implementation of one such scheme we have verified the predicted amplitude quantum correlations between the four resulting nodes.

[1] C. Gabriel et al., Phys. Rev. Lett. 106, 060502 (2011)

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