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{{Use American English|date=January 2019}}{{Short description|Two-bit quantum communication protocol
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{{multiple issues|{{more footnotes|date=August 2013}}
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[[File:Superdense coding.png|right|frame|When the sender and receiver share a Bell state, two classical bits can be packed into one qubit. In the diagram, lines carry [[qubit]]s, while the doubled lines carry classic [[bit]]s. The variables b<sub>1</sub> and b<sub>2</sub> are classic boolean, and the zeroes at the left hand side represent the pure [[quantum state]] <math>|0\rangle</math>. See the section named "[[Superdense coding#The protocol|The protocol]]" below for more details regarding this picture.]]
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