Abstract
A pair of photons generated in the nonlinear process of spontaneous parametric down conversion is, in general, entangled so as to contain strong energy, time, polarization, and momentum quantum correlations. This entanglement involving more than one pair of quantum variable, known as hyper-entanglement entanglement, serves as a powerful tool in fundamental studies of foundations of the quantum theory, in the development of novel information processing techniques, and in the construction of new quantum measurement technologies, such as quantum ellipsometry.
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