06 · A resource
Teleport
Entanglement is not a vibe. It is a consumable: a Bell pair plus two classical bits move an unknown qubit. The original is gone. No cloning was involved.
In English
Teleportation does not fax a particle. Alice and Bob share an entangled pair. Alice measures her unknown qubit together with her half of the pair, calls Bob with two ordinary bits, and Bob tweaks his half. The unknown state is now his. Hers is gone.
- Try this
- Prepare Alice’s state. Run the protocol. Bob’s Bloch sphere should match what Alice had, and Alice’s should not.
- Keep this
- Teleportation consumes entanglement and two classical bits. Nothing is cloned.
Lab · consume a Bell pair
Alice’s unknown state
θ
φ
Alice’s qubit on q0, Bob idle
0.71|000⟩ + 0.71|100⟩
|000⟩0.7150%|100⟩0.7150%|010⟩00%|110⟩00%|001⟩00%|101⟩00%|011⟩00%|111⟩00%
Alice (original)
Bob (waiting)
Teleportation is a compiler primitive: move a qubit across a chip without a SWAP chain, or between nodes of a network, by spending ebits and two bits of a classical channel.
The Bell pair has to be there already. Distributing those pairs — entanglement purification, repeaters — is the networking problem. The circuit in this lab assumes the pair is fresh.