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How the result of a measurement of a component of the spin of a spin- 1/2 particle can turn out to be 100

Aharonov, Yakir, Albert, David Z., Vaidman, Lev·1988·Physical Review Letters
DOI 10.1103/physrevlett.60.1351
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Abstract

We have found that the usual measuring procedure for preselected and postselected ensembles of quantum systems gives unusual results. Under some natural conditions of weakness of the measurement, its result consistently defines a new kind of value for a quantum variable, which we call the weak value. A description of the measurement of the weak value of a component of a spin for an ensemble of preselected and postselected spin-(1/2 particles is presented.

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Crossref · 10.1103/physrevlett.60.1351

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  • The weak value of an observable can be beyond the usual range of eigenvalues of that observable, referred as amplification effect for weak signal.

    “In the weak measurement the induced weak value of the observable on the measured system is usually a complex number, and can be beyond the usual range of eigenvalues of that observable.This property of weak value is referred as the amplification effect for weak signal”

    From Direct measurement methods of density matrix of an entangled quantum state (2020) · cites this paper as [1]

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Research works printed but not linked: 1

  1. Y. Aharonov, 1987, Phys. Lett. A, 124, 199, 10.1016/0375-9601(87)90619-0 · DOI

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Metadata

Authors
Aharonov, Y., Albert, D. Z., & Vaidman, L.
Venue
Physical Review Letters
Publisher
American Physical Society (APS)
Published
1988-04-04
Volume
60
Issue
14
Pages
1351-1354
ISSN
0031-9007
DOI
10.1103/physrevlett.60.1351
Cited by
2,297
References
0
Language
en
Licence
link.aps.org/licenses/aps-default-license (vor)

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