Quantum Communication3 QubitsEntanglement & Classical Feedforward6 Learning Stages
Quantum Teleportation
Transfer arbitrary quantum states across arbitrary distances without moving the physical particle.
Stage 6 Required
Plain-Language Intuition
Imagine Alice has a fragile soap bubble (an unknown quantum state |ψ⟩).
If she tries to look at it or measure it, it pops (measurement collapse).
Because of the No-Cloning Theorem, she cannot even make a photocopy of it!
How can she send this exact bubble to Bob on the other side of the world?
1. Alice and Bob first share an entangled pair of particles (Bell pair).
2. Alice interacts her mystery bubble with her half of the entangled pair and measures them.
3. This creates 2 classical bits (like a phone call message), and destroys Alice's original bubble.
4. Alice calls Bob with the 2 bits. Bob uses these bits to rotate his entangled particle, and miraculously, Alice's exact bubble appears in Bob's hands!