Solution (source code)

= Solution

<Quantum teleportation> transfers the <quantum state> of an unknown <qubit> from a sender's carrier to a receiver's carrier. It also transfers correlations with any external reference. It does not determine classical amplitudes or send the original particle.

The standard deterministic protocol consumes \b[one shared maximally entangled Bell pair and two classical bits] from Alice to Bob. Alice performs a local <Bell-basis measurement> on the input and her half of the pair; Bob applies the corresponding local <Pauli gate>. The classical message is essential: before receiving it, Bob has the outcome-averaged <density operator> $I/2$ and cannot recover or detect the unknown state. The original input is consumed by the measurement, so <quantum teleportation> is compatible with the <no-cloning theorem>.