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Entropy 2018, 20(8), 566;

A Method for Measuring the Weak Value of Spin for Metastable Atoms

Department of Physics and Astronomy, University College, Gower Street, London WC1E 6BT, UK
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 27 April 2018 / Revised: 26 July 2018 / Accepted: 27 July 2018 / Published: 30 July 2018
(This article belongs to the Special Issue Emergent Quantum Mechanics – David Bohm Centennial Perspectives)
PDF [12688 KB, uploaded 30 July 2018]


A method for measuring the weak value of spin for atoms is proposed using a variant of the original Stern–Gerlach apparatus. A full simulation of an experiment for observing the real part of the weak value using the impulsive approximation has been carried out. Our predictions show a displacement of the beam of helium atoms in the metastable 23S1 state, Δw, that is within the resolution of conventional microchannel plate detectors indicating that this type of experiment is feasible. Our analysis also determines the experimental parameters that will give an accurate determination of the weak value of spin. Preliminary experimental results are shown for helium, neon and argon in the 23S1 and 3P2 metastable states, respectively. View Full-Text
Keywords: weak measurement; transition probability amplitude; atomic metastable states weak measurement; transition probability amplitude; atomic metastable states

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Flack, R.; Monachello, V.; Hiley, B.; Barker, P. A Method for Measuring the Weak Value of Spin for Metastable Atoms. Entropy 2018, 20, 566.

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