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Everything about Superdense coding

Two-bit quantum communication protocol

In quantum information theory, superdense coding is a quantum communication protocol to communicate a number of classical bits of information by only transmitting a smaller number of qubits, under the assumption of sender and receiver pre-sharing an entangled resource. In its simplest form, the protocol involves two parties, often referred to as Alice and Bob in this context, which share a pair of maximally entangled qubits, and allows Alice to transmit two bits to Bob by sending only one qubit. This protocol was first proposed by Charles H. Bennett and Stephen Wiesner in 1970 and experimentally actualized in 1996 by Klaus Mattle, Harald Weinfurter, Paul G. Kwiat and Anton Zeilinger using entangled photon pairs. Superdense coding can be thought of as the opposite of quantum teleportation, in which one transfers one qubit from Alice to Bob by communicating two classical bits, as long as Alice and Bob have a pre-shared Bell pair. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Superdense codingA 5-minute orientation
  2. Skim a recent paper: Quantum key secure communication protocol via enhanced superdense codingInfluential work since 2022
  3. Pick up a classic book: Classical and Quantum Information TheoryThe most-reprinted book on the subject
  4. Read the landmark paper: Quantum secure direct communication with high-dimension quantum superdense codingCited 828 times
  5. Go sideways: Monogamy of entanglementA closely related topic
  6. Go sideways: Quantum channelA closely related topic

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🗂️ The subject at a glance

  1. Overview
  2. The protocol
  3. Security
  4. General dense coding scheme
  5. Experimental

🏆 Landmark papers (most cited)

🆕 Influential since 2022

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