Quantum Measurements and Information Theory
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Max Born  (1926) has proposed the statistical interpretation of quantum mechanics and there is no doubt that it well describes the statistics of pointer readings. Is this knowledge sufficient for to understand the physical reality of microparticles, i.e. can a physical theory be complete if nothing behind the statistics of pointer readings is assumed? Such questions arose shortly after Max Born’s proposal in the Bohr-Einstein debate which culminated in the famous Einstein-Podolsky-Rosen paradox . Later investigations have led to the Bell type inequalities . The experimental tests by A. Aspect and his coworkers gave deep insight into the physical situation: IT somebody believes in the physical reality of accidental properties of a single microparticle described by some kind of hidden variables, then he has to assume the existence of actions at a distance.
KeywordsPure State Positive Operator Density Operator Physical Reality Quantum Measurement
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