Journal
OPTICS EXPRESS
Volume 20, Issue 21, Pages 23589-23597Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.023589
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Funding
- Canada Excellence Research Chairs program
- US DARPA InPho program
- Royal Society
- NRF
- CSIR
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Orbital angular momentum (OAM) entanglement is investigated in the Bessel-Gaussian (BG) basis. Having a readily adjustable radial scale, BG modes provide an alternative basis for OAM entanglement over Laguerre-Gaussian modes. We show that the OAM bandwidth in terms of BG modes can be increased by selection of particular radial wavevectors and leads to a flattening of the spectrum, which allows for higher dimensionality in the entangled state. We demonstrate entanglement in terms of BG modes by performing a Bell-type experiment and showing a violation of the Clauser-Horne-Shimony-Holt inequality for the l = +/- 1 subspace. In addition, we use quantum state tomography to indicate higher-dimensional entanglement in terms of BG modes. (C) 2012 Optical Society of America
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