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[[File:Superdense coding.png|right|frame|When the sender and receiver share a bell pair, two classical bits can be packed into one qubit.]]
In [[quantum information theory]], '''superdense coding''' is a technique used to send two bits of classical information using only one [[qubit]]<ref name="NielsenChuang2010">{{cite book|author1=Michael A. Nielsen|author2=Isaac L. Chuang|title=Quantum Computation and Quantum Information: 10th Anniversary Edition|url=http://books.google.com/books?id=-s4DEy7o-a0C|date=9 December 2010|publisher=Cambridge University Press|isbn=978-1-139-49548-6 |page=97 |section=2.3 Application: superdense coding}}</ref>. It is the dual of [[quantum teleportation]], which sends one qubit with two classical bits. Both superdense coding and quantum teleportation require, and use up, [[quantum entanglement|entanglement]] between the sender and receiver in the form of [[bell state|bell pairs]].
== Overview ==
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