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Dec 28 2007   2:11AM GMT

Overheard: Quantum computing

Margaret Rouse Margaret Rouse Profile: Margaret Rouse

cat.gif “The fundamental unit of information in quantum computing (called a quantum bit or qubit), is not binary but rather more quaternary in nature, which differs radically from the laws of classical physics.”

Casey Kazan, The Quantum Future of Computing

A qubit can exist not only in a state corresponding to the logical state 0 or 1 as in a classical bit, but also in states corresponding to a blend or superposition of these classical states. In other words, a qubit can exist as a zero, a one, or simultaneously as both 0 and 1, with a numerical coefficient representing the probability for each state. This may seem counterintuitive because everyday phenomenon are governed by classical Newtonian physics, not quantum mechanics — which takes over at the atomic level.

Good explanation of quantum computing here from Cosmos Magazine.

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