Abstract
Entangled states are central to the new field of quantum information, including quantum dense coding, teleportation, and computation. However, only a relatively small class of entangled states has been discussed extensively, much less investigated experimentally. In particular, efforts to date have focussed on two particles entangled in a single degree of freedom, for example polarization, or energy, or momentum direction. Novel phase-matching arrangements in spontaneous parametric down-conversion allow the preparation of pairs of photons that are simultaneously entangled in polarization, momentum-direction, and energy. We shall call such a multiply-entangled state “hyper-entangled”. In addition, an even more general state — a non-maximally entangled state — should be realizable, in which the amplitudes of the contributing terms are not equal.
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Kwiat, P.G. (1997). Production and Uses of Hyper-Entangled States. In: Ferrero, M., van der Merwe, A. (eds) New Developments on Fundamental Problems in Quantum Physics. Fundamental Theories of Physics, vol 81. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5886-2_25
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DOI: https://doi.org/10.1007/978-94-011-5886-2_25
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