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dmtr

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From the http://physicsworld.com/cws/article/news/23637

How can that be possible? Isn't that a violation of the No-cloning theorem?

The effect could be used to read out quantum bits (qubits) in a reliable way because the quantum capacitance of the excited state of the qubit has the opposite sign to the ground state. These states could be used as the "1s" and "0s" in a quantum computer. Indeed Hakonen and colleagues have already used this approach to read the value of a qubit without changing its value -- which is almost always a problem when measuring the quantum state of any system.

How can that be possible? Isn't that a violation of the No-cloning theorem?

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