Holevo's theorem
Upper bound on the knowable information of a quantum state / From Wikipedia, the free encyclopedia
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Holevo's theorem is an important limitative theorem in quantum computing, an interdisciplinary field of physics and computer science. It is sometimes called Holevo's bound, since it establishes an upper bound to the amount of information that can be known about a quantum state (accessible information). It was published by Alexander Holevo in 1973.