'Measurement of Quantum Mechanical Operators' Revisited

Details 'Measurement of Quantum Mechanical Operators' Revisited 'Measurement of Quantum Mechanical Operators' Revisited

2010-12-20

arxiv.org/abs/1012.4362v2

Physics

Quantum Physics

Version 2 contains some corrections and improvements suggested by an anonymous referee

Scientific paper

10.1140/epjd/e2011-10714-3

The Wigner-Araki-Yanase (WAY) theorem states a remarkable limitation to quantum mechanical measurements in the presence of additive conserved quantities. Discovered by Wigner in 1952, this limitation is known to induce constraints on the control of individual quantum systems in the context of information processing. It is therefore important to understand the precise conditions and scope of the WAY theorem. Here we elucidate its crucial assumptions, briefly review some generalizations, and show how a particular extension can already be obtained by a simple modification of the original proofs. We also describe the evolution of the WAY theorem from a strict no-go verdict for certain, highly idealized, precise measurements into a quantitative constraint on the accuracy and approximate repeatability of imprecise measurements.

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