Entropic uncertainties for joint quantum measurements

Details Entropic uncertainties for joint quantum measurements Entropic uncertainties for joint quantum measurements

2008-12-08

arxiv.org/abs/0812.1474v2

Physics

Quantum Physics

13 pages, introduction re-written and extended discussion of results

Scientific paper

We investigate the uncertainty associated with a joint quantum measurement of two components of spin of a spin-1/2 particle and quantify this in terms of entropy. We consider two entropic quantities: the joint entropy and the sum of the marginal entropies, and obtain lower bounds for each of these quantities. For the case of joint measurements where we measure each spin observable equally well, these lower bounds are tight.

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