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Phys Rev Lett. 2005 Dec 31;95(26):260501. Epub 2005 Dec 19.

Generation of hyperentangled photon pairs.

Author information

1
Department of Physics, University of Illinois at Urbana-Champaign, 61801-3080, USA.

Abstract

We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled). Using pairs of photons produced in spontaneous parametric down-conversion, we verify entanglement by observing a Bell-type inequality violation in each degree of freedom: polarization, spatial mode, and time energy. We also produce and characterize maximally hyperentangled states and novel states simultaneously exhibiting both quantum and classical correlations. Finally, we report the tomography of a 2 x 2 x 3 x 3 system (36-dimensional Hilbert space), which we believe is the first reported photonic entangled system of this size to be so characterized.

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