Phys. Rev. A 80, 042106 (2009) [10 pages]Entropic uncertainties for joint quantum measurementsReceived 8 December 2008; revised 26 June 2009; published 7 October 2009 We investigate the uncertainty associated with a joint quantum measurement of two spin components 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.042106
DOI:
10.1103/PhysRevA.80.042106
PACS:
03.65.Ta, 03.67.−a
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