Quantum measurements constrained by symmetries

Research output: Chapter in Book/Report/Conference proceedingConference contribution



Publication details

Title of host publicationSymmetries and groups in contemporary physics
DatePublished - Sep 2013
Number of pages6
PublisherWorld Scientific Publishing
Place of PublicationSingapore
EditorsChengming Bai, Jean-Pierre Gazeau, Mo-Lin Ge
Original languageEnglish
ISBN (Electronic)978-981-4518-56-7
ISBN (Print)978-981-4518-54-3

Publication series

NameNankai Series in Pure, Applied Mathematics and Theoretical Physics
PublisherWorld Scientific Publishing


We revisit the theorem of Wigner, Araki and Yanase (WAY) describing limitations to repeatable quantum measurements that arise from the presence of conservation laws. We will review a strengthening of this theorem by exhibiting and discussing a condition that has hitherto not been identified as a relevant factor. We will also show that an extension of the theorem to continuous variables such as position and momentum can be obtained if the degree of repeatability is suitably quantified.

    Research areas

  • quant-ph, 81P15

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