Photodetection and causality II

M. de Haan

Physica A: Statistical Mechanics and its Applications, 1985, vol. 132, issue 2, 397-420

Abstract: We continue in this paper the investigation of the link between the measurement process in quantum mechanics and causality associated with a finite velocity of field propagation. We focalize on the multiple photodetection and we prove that the surmise of our previous paper is indeed confirmed: when multiple measurements are involved, quantum mechanics violates causality at the macroscopic level. We illustrate how such a paradox disappears by going to a semigroup description. The evolution of the density matrix is then described in terms of a non-factorizable and non-unitary operator, in contrast with the solution of the Liouville-von Neumann equation.

Date: 1985
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:132:y:1985:i:2:p:397-420

DOI: 10.1016/0378-4371(85)90018-4

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