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Phys Rev Lett. 2000 Jun 5;84(23):5304-7.

Continuous frequency entanglement: effective finite hilbert space and entropy control

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Center for Quantum Information, University of Rochester, Rochester, New York 14627 and Rochester Theory Center for Optical Science and Engineering and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.


We examine the quantum structure of continuum entanglement and in the context of short-pulse down-conversion we answer the open question of how many of the uncountably many frequency modes contribute effectively to the entanglement. We derive a set of two-photon mode functions that provide an exact, discrete, and effectively finite basis for characterizing pairwise entanglement. Our analysis provides a basis for entropy control in two-photon pulses generated from down-conversion.

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