Quantum Teleportation Protocol | Disembodied State Transfer
Quick Technical Answer:
Quantum teleportation transmits an unknown quantum state |ψ⟩ from a sender (Alice) to a receiver (Bob) using a pre-shared entangled Bell pair and 2 classical bits of communication without physically moving the qubit or violating the no-cloning theorem.
Formula / Unitary:
|\psi\rangle |\Phi^+\rangle = \frac{1}{2} \sum_{i=0}^3 |\beta_i\rangle (\sigma_i |\psi\rangle)
Simulate this in Itachi Quantum Studio
Inspect state amplitudes, 3D Bloch sphere vector, and OpenQASM code live.
Protocol Execution Steps
1. Alice and Bob share an entangled Bell pair (|00⟩ + |11⟩)/√2.
2. Alice performs a Bell state measurement (CNOT followed by Hadamard) on her unknown qubit |ψ⟩ and her half of the Bell pair.
3. Alice measures both qubits, obtaining 2 classical bits (00, 01, 10, or 11).
4. Alice transmits the 2 bits to Bob over a classical channel.
5. Bob applies conditional Pauli corrections (I, X, Z, or XZ) to reconstruct the exact state |ψ⟩.
Frequently Asked Questions
Does quantum teleportation allow faster-than-light communication?
No. Bob cannot reconstruct the state until he receives the 2 classical bits from Alice, which travel at or below the speed of light.