![]() In other words, quantum states cannot be measured reliably. Similarly, cloning would violate the no teleportation theorem, which says classical teleportation (not to be confused with entanglement-assisted teleportation) is impossible.In 1995, Shor and Steane revived the prospects of quantum computing by independently devising the first quantum error correcting codes, which circumvent the no-cloning theorem. Error correction is vital for practical quantum computing, and for some time this was thought to be a fatal limitation. For example, we cannot create backup copies of a state in the middle of a quantum computation, and use them to correct subsequent errors. ![]() ![]()
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