https://quantum.cloud.ibm.com/learning/en/courses/utility-scale-quantum-computing/teleportation
- Quantum Teleportation: send unknown quantum state using shared entangled state (e-bit); require classical communication
- Quantum Superdense Coding: send 2 bits of information using a single qubit (still using shared entangled qubits)
How to send quantum state from Alice to Bob?
Protocol:
- Goal: To send unknown quantum state $|\psi \rangle$ from Alice to Bob.
- Pre-condition: Alice and Bob shares 2-qubit entangled state (e-bit); One part with each.
- Alice uses her part of e-bit to entangle $|\psi \rangle$ using CNOT gate.
- Further applies Hadamard gate to $|\psi \rangle$ and performs measurment both qubits.
- The results are sent to Bob.
- Bob performs correction on Alice’s two bit information.
- If everything correct, Bob’s e-bit part becomes $|\psi \rangle$.
https://quantum.microsoft.com/en-us/insights/education/concepts/quantum-teleportation