Generation of hyperentangled photon pairs |
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Authors: | Barreiro Julio T Langford Nathan K Peters Nicholas A Kwiat Paul G |
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Institution: | Department of Physics, University of Illinois at Urbana-Champaign, 61801-3080, USA. |
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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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