Free motion time-of-arrival operator and probability distribution

Details Free motion time-of-arrival operator and probability distribution Free motion time-of-arrival operator and probability distribution

1999-05-07

arxiv.org/abs/quant-ph/9905023v1

Phys.Rev.A61:012104,1999

Physics

Quantum Physics

10 a4 pages, no figures

Scientific paper

10.1103/PhysRevA.61.012104

We reappraise and clarify the contradictory statements found in the literature concerning the time-of-arrival operator introduced by Aharonov and Bohm in Phys. Rev. {\bf 122}, 1649 (1961). We use Naimark's dilation theorem to reproduce the generalized decomposition of unity (or POVM) from any self-adjoint extension of the operator, emphasizing a natural one, which arises from the analogy with the momentum operator on the half-line. General time operators are set within a unifying perspective. It is shown that they are not in general related to the time of arrival, even though they may have the same form.

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