Subspace constraints for joint measurability

Jukka Kiukas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)
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Abstract

The structure of quantum effects, positive operators of norm at most one, played a central role in the work of Paul Busch on uncertainty, complementarity, and joint measurability in quantum measurement theory. Here we focus on one aspect of this structure, called "strength of an effect along a ray"[Lett. Math. Phys. 47 329 (1999)], presenting a few observations not explicit in the existing literature. In fact, the strength function turns out to be useful for characterising positivity and complementarity of quantum effects of a suitable block matrix form, and for studying extensions of joint measurements defined on a subspace of codimension one.

Original languageEnglish
Article number012003
Number of pages13
JournalJournal of Physics: Conference Series
Volume1638
Issue number1
DOIs
Publication statusPublished - 11 Nov 2020
Event2019 Workshop on Mathematical Foundations of Quantum Mechanics - in Memoriam Paul Busch - York, United Kingdom of Great Britain and Northern Ireland
Duration: 18 Jun 201919 Jun 2019

Keywords

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