Another measure of how well a quantum channel preserves information is called channel fidelity, and it arises from fidelity of quantum states.
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Famous quotes containing the words channel and/or fidelity:
“How old the world is! I walk between two eternities.... What is my fleeting existence in comparison with that decaying rock, that valley digging its channel ever deeper, that forest that is tottering and those great masses above my head about to fall? I see the marble of tombs crumbling into dust; and yet I don’t want to die!”
—Denis Diderot (1713–1784)
“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)
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