Comment on "Experimental demonstration of a universally valid   error-disturbance uncertainty relation in spin measurements"
  In this comment we show that the experimental results for a universally valid uncertainty relation in ref.[J. Erhart et al. Nat. Phys.(2012)10.1038/nphys2194]cannot be justified. The experiments cannot be recognized to establish a violation of the Heisenberg-type uncertainty relation suggested by Ozawa[Phys. Lett. A318(2003)21, Phys. Rev. A67(2003)042105]. 
Yoshimasa Kurihara
quant-ph