User talk:Djobes/SDC

In quantum information theory, superdense coding is a quantum communication protocol to transmit two classical bits of information (i.e., either 00, 01, 10, or 11) from a sender (often called Alice or referred to as "A") to a receiver (often called Bob or "B"), by sending only one qubit from Alice to Bob, under the assumption of Alice and Bob pre-sharing an entangled state. Suggestion: describe the settings under which Alice and Bob are communicating, for example: do they need to be close together? Rronk96 (talk) 22:18, 19 November 2018 (UTC)

By performing one of four quantum gate operations on the (entangled) qubit she possesses, Alice can prearrange the measurement Bob makes. After receiving Alice's qubit, operating on the pair and measuring both, Bob has two classical bits of information. If Alice and Bob do not already share entanglement before the protocol begins, then it is impossible to send two classical bits using 1 qubit, as this would violate Holevo's theorem. Which four quantum gate operations?' Brief explanation of Holevo's Theorem? Rronk96 (talk) 22:18, 19 November 2018 (UTC)

Superdense coding is the underlying principle of secure quantum communication. The necessity of having both qubits to decode the information being sent eliminates the risk of eavesdroppers intercepting messages. Rronk96 (talk) 22:18, 19 November 2018 (UTC)