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Q: Quantenoptik und Photonik
Q 45: Quanteninformation IV
Q 45.3: Talk
Friday, March 26, 2004, 11:45–12:00, HS 101
Photon polarisation entanglement from distant dipole sources — •Almut Beige1,2 and Yuan Liang Lim1 — 1Blackett Laboratory, Imperial College London, London, UK — 2Centre for Quantum Information, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK
It is commonly believed that photon polarisation entanglement can only be obtained via pair creation within the same source or via postselective measurements on photons that overlapped within their coherence time inside a linear optics setup. In contrast to this, we show here that polarisation entanglement can also be produced by distant single photon sources and without the photons ever having to meet, if the detection of a photon does not reveal its origin – the which way information. In the case of two sources, the entanglement arises under the condition of two emissions in certain spatial directions and leaves the dipoles in a maximally entangled state [1].
[1] Y. L. Lim and A. Beige, quant-ph/0308095.