Quantum-mechanical histories and the uncertainty principle: Information-theoretic inequalities

J. J. Halliwell
Phys. Rev. D 48, 2739 – Published 15 September 1993
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Abstract

This paper is generally concerned with understanding how the uncertainty principle arises in formulations of quantum mechanics, such as the decoherent histories approach, whose central goal is the assignment of probabilities to histories. We first consider histories characterized by position or momentum projections at two moments of time. Both exact and approximate (Gaussian) projections are studied. Shannon's information is used as a measure of the uncertainty expressed in the probabilities for these histories. We derive a number of inequalities in which the uncertainty principle is expressed as a lower bound on the information of phase space distributions derived from the probabilities for two-time histories. We go on to consider histories characterized by position samplings at n moments of time. We derive a lower bound on the information of the joint probability for n position samplings. Similar bounds are derived for histories characterized by samplings of other variables. All lower bounds on the information of histories have the general form ln(VHVS), where VH is a volume element of history space, which we define, and VS is the volume of that space probed by the projections. We thus obtain a concise and general form of the uncertainty principle referring directly to the histories description of the system, and making no reference to notions of phase space.

  • Received 3 May 1993

DOI:https://doi.org/10.1103/PhysRevD.48.2739

©1993 American Physical Society

Authors & Affiliations

J. J. Halliwell*

  • Theory Group, Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom

  • *E-mail address: j_halliwell@vax1.physics.imperial.ac.uk

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Vol. 48, Iss. 6 — 15 September 1993

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