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:
“Wherever there is a channel for water, there is a road for the canoe.”
—Henry David Thoreau (1817–1862)
“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)