Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Joint measurements of spin, operational locality, and uncertainty

Andersson, E. and Barnett, S.M. and Aspect, A. (2005) Joint measurements of spin, operational locality, and uncertainty. Physical Review A, 72 (4). 042104-1-042104-8. ISSN 1094-1622

[img]
Preview
PDF (strathprints002858.pdf)
strathprints002858.pdf

Download (189kB) | Preview

Abstract

Joint, or simultaneous, measurements of noncommuting observables are possible within quantum mechanics, if one accepts an increase in the variances of the jointly measured observables. In this paper, we discuss joint measurements of a spin-1/2 particle along any two directions. Starting from an operational locality principle, it is shown how to obtain a bound on how sharp the joint measurement can be. We give a direct interpretation of this bound in terms of an uncertainty relation.