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Pure qubit state (259 words) |
 | In quantum information processing, a pure qubit state is a linear superposition[?] of two basis states, conventionally written 0⟩ and 1⟩ (ket 0 and ket 1). |
| A pure qubit state is often written as the sum a 0⟩ + b 1⟩, or as a column vector (a, b) where a and b are the complex amplitudes associated with 0⟩ and 1⟩, respectively. |
| If the state 0⟩ is measured, a is changed to a magnitude of 1 and b is changed to a magnitude of 0 (see magnitude of complex numbers). |
| PlanetMath: state (190 words) |
| A state is pure if it is not a convex combination of two other states. |
| Pure states are the extreme points of the convex set of states. |
| This is version 5 of state, born on 2003-08-11, modified 2006-11-21. |
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