Generation of hyperentangled photon pairs

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, spati...

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Bibliographic Details
Published inPhysical review letters Vol. 95; no. 26; p. 260501
Main Authors Barreiro, Julio T, Langford, Nathan K, Peters, Nicholas A, Kwiat, Paul G
Format Journal Article
LanguageEnglish
Published United States 31.12.2005
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Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.95.260501