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@Dänu: there is more than one way to represent a qubit. Some of the representations involve more redundant information than others, which may obfuscate similarities between states but which makes it easier to compose transformations. Twistor59's answer here accurately describes the minimal representation for pure states, and is fairly standard. The other, involving two complex numbers, extends more easily to performing linear transformations describing the evolution of states. It's not really an enormous amount of overhead in the big scheme of things.

This post imported from StackExchange Physics at 2015-01-03 19:22 (UTC), posted by SE-user Niel de Beaudrap
commented Jan 2, 2013 by Niel de Beaudrap (270 points) [ no revision ]




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