Fidelity Of Quantum States
In quantum information theory, fidelity is a measure of the "closeness" of two quantum states. It is not a metric on the space of density matrices, but it can be used to define the Bures metric on this space.
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Famous quotes containing the words fidelity, quantum and/or states:
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—Hannah Arendt (1906–1975)
“A personality is an indefinite quantum of traits which is subject to constant flux, change, and growth from the birth of the individual in the world to his death. A character, on the other hand, is a fixed and definite quantum of traits which, though it may be interpreted with slight differences from age to age and actor to actor, is nevertheless in its essentials forever fixed.”
—Hubert C. Heffner (1901–1985)
“On the whole, the great success of marriage in the States is due partly to the fact that no American man is ever idle, and partly to the fact that no American wife is considered responsible for the quality of her husband’s dinners.”
—Oscar Wilde (1854–1900)