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Quantum dense coding via a two-mode squeezed-vacuum state is proposed, where classical information is encoded in two quadrature components of one mode of a two-mode squeezed-vacuum state. Decoding at a receiver side is performed by simultaneous measurement of two quadrature components of the two-mode state. Since a two-mode squeezed-vacuum state is partially entangled, the information can only be transmitted without error in the strong-squeezing limit.
Masashi Ban (Mon,) studied this question.
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