Weak value controversy

L. Vaidman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Recent controversy regarding the meaning and usefulness of weak values is reviewed. It is argued that in spite of recent statistical arguments by Ferrie and Combes, experiments with anomalous weak values provide useful amplification techniques for precision measurements of small effects in many realistic situations. The statistical nature of weak values is questioned. Although measuring weak values requires an ensemble, it is argued that the weak value, similarly to an eigenvalue, is a property of a single pre- and post-selected quantum system. This article is part of the themed issue ‘Second quantum revolution: foundational questions’.

Original languageEnglish
Article number20160395
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2106
StatePublished - 13 Nov 2017


  • Quantum measurements
  • Two-state vector formalism
  • Weak value


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