Physics – Quantum Physics
Scientific paper
2004-06-18
Rivista del Nuovo Cimento 18(4) (1995) 1-27
Physics
Quantum Physics
28 pages, 3 figures in pdf format. This review paper, which appeared in 1995, is being made available here in view of the rene
Scientific paper
10.1007/BF02743814
Three notions of complementarity - operational, probabilistic, and value complementarity - are reanalysed with respect to the question of joint measurements and compared with reference to some examples of canonically conjugate observables. It is shown that the joint measurability of noncommuting observables is a consequence of the quantum formalism if unsharp observables are taken into account; a fact not in conflict with the idea of complementarity, which, in its strongest version, was originally formulated only for sharp observables. As an illustration of the general theory, the wave-particle duality of photons is analysed in terms of complementary path and interference observables and their unsharp joint measurability.
Busch Paul
Lahti P. J.
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