The superdense coding protocol operates on the principle that entanglement allows for the transmission of classical information exceeding standard channel capacity limits through high-level quantum state manipulation and measurement theory. This concept belongs to Quantum Information Theory, specifically utilizing Bell states as fundamental resources where local unitary operations map distinct two-bit inputs onto orthogonal four-dimensional basis vectors in a shared entangled subspace. The protocol demonstrates that by preparing an initial maximally entangled state and applying specific conditional gates (Identity, X, Z, or ZX), the sender enables the receiver to distinguish all possible states via CNOT-Hadamard sequences followed by computational basis measurement.
The superdense coding protocol operates on the principle that entanglement allows for the transmission of classical information exceeding standard channel capacity limits through high-level quantum s…