Protective measurements: probing single quantum systems.

Making measurements on single quantum systems is considered difficult, almost impossible if the state is a priori unknown. Protective measurements suggest a possibility to measure single quantum systems and gain some new information in the process. Protective measurement is described here, both in the original and generalized form. The degree to which the system and the apparatus remain entangled in a protective measurement, is assessed. Possible experimental tests of protective measurements are also discussed. [ABSTRACT FROM AUTHOR]

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