ExperimentsExperiment 10 · Quantum information
Quantum Teleportation
Move a quantum state using entanglement plus two classical bits.
- 1. Learn
- 2. Watch
- 3. Interact
- 4. Predict
- 5. Run
- 6. Observe
- 7. Record
- 8. Answer
- 9. Research
① What is the problem?
Can Alice send an unknown qubit state to Bob without sending the qubit?
② How does a classical computer approach it?
She cannot measure it to learn α and β — measurement destroys the state.
③ How does the quantum approach differ?
Using a shared entangled pair, a Bell-basis measurement, 2 classical bits and a correction, Bob's qubit ends in exactly |ψ⟩.
④ What is happening mathematically?
|ψ⟩|Φ⁺⟩ = ½ Σ |Bell_ij⟩ XʲZⁱ|ψ⟩ — each outcome leaves Bob with |ψ⟩ up to a known Pauli.
⑤ What does the simulation show?
The circuit step by step, Alice's and Bob's Bloch vectors, and the fidelity — all from simulation.
⑥ What did we learn?
Teleportation moves information, not matter, and it cannot be faster than light (it needs the classical bits).
⑦ What can you experiment with?
Run it several times: the measured bits change, but the fidelity is always 1.