In quantum information theory, an entanglement witness is an object of geometric nature which distinguishes an entangled state from separable ones.
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Famous quotes containing the words entanglement and/or witness:
“It would be one of the greatest triumphs of humanity, one of the most tangible liberations from the constraints of nature to which mankind is subject, if we could succeed in raising the responsible act of procreating children to the level of a deliberate and intentional activity and in freeing it from its entanglement with the necessary satisfaction of a natural need.”
—Sigmund Freud (1856–1939)
“No matter what our achievements might be, we think well of ourselves only in rare moments. We need people to bear witness against our inner judge, who keeps book on our shortcomings and transgressions. We need people to convince us that we are not as bad as we think we are.”
—Eric Hoffer (1902–1983)