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.
Read more about Fidelity Of Quantum States: Motivation, Definition, Fidelity of Quantum Measurements
Famous quotes containing the words fidelity, quantum and/or states:
“The genius of American culture and its integrity comes from fidelity to the light. Plain as day, we say. Happy as the day is long. Early to bed, early to rise. American virtues are daylight virtues: honesty, integrity, plain speech. We say yes when we mean yes and no when we mean no, and all else comes from the evil one. America presumes innocence and even the right to happiness.”
—Richard Rodriguez (b. 1944)
“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)
“I asked myself, “Is it going to prevent me from getting out of here? Is there a risk of death attached to it? Is it permanently disabling? Is it permanently disfiguring? Lastly, is it excruciating?” If it doesn’t fit one of those five categories, then it isn’t important.”
—Rhonda Cornum, United States Army Major. As quoted in Newsweek magazine, “Perspectives” page (July 13, 1992)