24
October 2002
Quantum computing: Qubit parts
The 'bit' of information in a classical computer flips between 1 and 0, a system known as a logical NOT gate. Quantum information is a bit more complex, being represented by qubits which are two-level systems that can be in either level but also in any superposition of them. So the report this week of the experimental realization of a system closely approximating a universal NOT gate is a significant development in quantum computing. The work also enters the realm of approximate quantum cloning.
Experimental
realization of the quantum universal NOT gate
F.
DE MARTINI, V. BUZEK, F. SCIARRINO & C. SIAS
Nature 419,
815–818 (2002); doi:10.1038/nature01093
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Quantum physics: NOT logic
NICOLAS
GISIN
A direct quantum equivalent of an electronic NOT gate is impossible.
But the best possible approximation to the universal NOT transformation has now
been demonstrated using photons.
Nature 419, 797–798 (2002);
doi:10.1038/419797a
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