Photon polarisation entanglement from distant dipole sources

Yuan Liang Lim; Almut Beige

doi:10.1088/0305-4470/38/1/L02

Photon polarisation entanglement from distant dipole sources

Quantum Physics 2009-11-10 v2

Authors: Yuan Liang Lim , Almut Beige

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Abstract

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 in free space 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.

Keywords

polarization optics polarization quantum entanglement

Cite

@article{arxiv.quant-ph/0308095,
  title  = {Photon polarisation entanglement from distant dipole sources},
  author = {Yuan Liang Lim and Almut Beige},
  journal= {arXiv preprint arXiv:quant-ph/0308095},
  year   = {2009}
}

Comments

7 pages, 2 figures, revised version, accepted for publication in J. Phys. A

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