An entanglement-assisted communication protocol that encodes two classical bits into one transmitted qubit.
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Superdense coding complements teleportation by making the communication direction and resource assumptions visible.
No input port at this edge: the record publishes no gate sequence and no register, so there is nothing here to read one off — and unlike a declared hole, nothing has been recorded about what belongs here.
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No output port at this edge: the record publishes no gate sequence and no register, so there is nothing here to read one off — and unlike a declared hole, nothing has been recorded about what belongs here.
Nothing in the Atlas meets this end.
This record publishes no gate sequence and no register, so there is nothing here to read an interface off. Absent rather than empty. See all 152 →
Superdense coding sends two classical bits using one qubit, given a pre-shared Bell pair . To send message , Alice applies to her half only, mapping the shared state to one of four orthogonal Bell states. She sends her single qubit to Bob, who now holds both halves and applies then to disentangle the pair into a computational basis state that decodes exactly to — the decoding circuit this record checks. Only one physical qubit travels, but the protocol depends on the Bell pair having been distributed beforehand; it does not transmit two arbitrary qubits' worth of quantum information over one qubit, matching the entry's own caveat that a pre-shared entangled resource, not raw channel capacity, is what is being spent.
from qiskit import QuantumCircuit
message = '10'
qc = QuantumCircuit(2, 2)
qc.h(0)
qc.cx(0, 1)
if message[0] == '1': qc.z(0)
if message[1] == '1': qc.x(0)
qc.cx(0, 1)
qc.h(0)
qc.measure([0, 1], [0, 1])
FINAL_CIRCUIT = qcCompare Entanglement and communication with the strongest classical method for the same instance, input budget, and output metric.
This reference exposes a quantum circuit pattern; it does not imply an application-level speedup without a matched benchmark.
Report input loading, circuit depth, repetitions, classical preprocessing, post-processing, and wall-clock time together.
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Original superdense-coding protocol: encoding two classical bits into one transmitted qubit using a shared entangled pair.
doi.org/10.1103/physrevlett.69.2881 ↗Standard graduate textbook covering the single- and two-qubit gate definitions, matrix identities, and circuit primitives this record states.
doi.org/10.1017/cbo9780511976667 ↗