Quantum mutual information capacity for high-dimensional entangled states |
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Authors: | Dixon P Ben Howland Gregory A Schneeloch James Howell John C |
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Institution: | Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA. |
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Abstract: | High-dimensional Hilbert spaces used for quantum communication channels offer the possibility of large data transmission capabilities. We propose a method of characterizing the channel capacity of an entangled photonic state in high-dimensional position and momentum bases. We use this method to measure the channel capacity of a parametric down-conversion state by measuring in up to 576 dimensions per detector. We achieve a channel capacity over 7 bits/photon in either the position or momentum basis. Furthermore, we provide a correspondingly high-dimensional separability bound that suggests that the channel performance cannot be replicated classically. |
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