Superdense coding is a quantum communication protocol that allows two parties to communicate more information than is typically possible using classical bits. It is based on the principles of quantum mechanics, particularly the phenomenon of entanglement. In superdense coding, two parties (often referred to as Alice and Bob) share an entangled pair of qubits.
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Superdense coding uses a shared Bell state to communicate two classical bits by transmitting one qubit. The sender selects one of four orthogonal Bell states with a local Pauli operator, and the receiver performs a Bell-basis measurement. For an ideal shared Bell pair, the transmitted qubit alone has a maximally mixed state for every message and reveals no information about the chosen encoding.