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:
“Total loyalty is possible only when fidelity is emptied of all concrete content, from which changes of mind might naturally arise.”
—Hannah Arendt (1906–1975)
“But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.”
—Antonin Artaud (1896–1948)
“My opinion is that the Northern states will manage somehow to muddle through.”
—John Bright (1811–1889)