Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 13: Quanteneffekte I

Q 13.2: Vortrag

Samstag, 5. März 2005, 08:45–09:00, HU 1072

Entanglement of Photons with Fractional Orbital Angular Momentum — •D. Voigt¹, S.S.R. Oemrawsingh¹, X. Ma¹, A. Aiello¹, E.R. Eliel¹, G.W. ’t Hooft^1,2, and J.P. Woerdman¹ — ¹Huygens Laboratory, Leiden University, The Netherlands (molphys.leidenuniv.nl/qo) — ²Philips Research Laboratories, Eindhoven, The Netherlands

High-dimensional entanglement gives access to stronger nonlocality, beyond 2-dim. polarization entanglement of twin photons. Orbital angular momentum (OAM) provides a suitable infinite-dimensional Hibert space. Fractional OAM, i.e. a superposition of Laguerre-Gauss modes, exploits these spatial degrees of freedom. We study twin photons that carry mixed screw-edge phase dislocations with half-integer OAM. These photons are detected with oriented spiral phase plates [1] in a 2-port scheme [2], reminiscent to polarization entanglement. We achieve a Clauser-Horne-Shimony-Holt parameter of S=3.06(7), the strongest violation of local realism to date.

[1] S.S.R. Oemrawsingh et al., Appl. Opt. 43, 688 (2004). [2] S.S.R. Oemrawsingh et al., PRL 91, 217901 (2004).