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)
“As a particularly dramatic gesture, he throws wide his arms and whacks the side of the barn with the heavy cane he uses to stab at contesting bidders. With more vehemence than grammatical elegance, he calls upon the great god Caveat Emptor to witness with what niggardly stinginess these flinty sons of Scotland make cautious offers for what is beyond any question the finest animal ever beheld.”
—Administration in the State of Arka, U.S. public relief program (1935-1943)