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Physics
Quantum Physics
Quantum Teleportation: Exploiting Entanglement & No Cloning Theorem
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[QUOTE="Strilanc, post: 5805387, member: 96470"] Quantum teleportation [URL='http://algassert.com/post/1624']is really really similar to a classical encryption method called the one-time pad[/URL]. That's one way to understand what teleportation is doing. Another way to understand what teleportation is doing is by [URL='http://algassert.com/post/1628']starting with a quantum circuit that swaps two qubits and making trivially correct changes to the circuit until you're left with teleportation[/URL]. [ATTACH=full]207365[/ATTACH] The measurement is what "destroys" the sender's "copy" of the state. But this is a bit misleading; even if you omitted the measurement, the teleportation circuit would simply replace the sender's qubit's state with the state ##|0\rangle + |1\rangle##. There's never actually a true copy of the state. No, it definitely has a direction. The sender is the one doing the Bell basis measurement and broadcasting the results, and the receiver is the one applying a fixup operation based on the outcome of the measurement. The [I]entanglement[/I] used by teleportation is directionless, though. An EPR pair can be used to send a qubit in either direction. Also you could easily create a (more complicated and requiring more entanglement) two-way teleportation that was completely symmetric and swapped a qubit at A for a qubit at B. [/QUOTE]
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Quantum Teleportation: Exploiting Entanglement & No Cloning Theorem
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