Heisenberg uncertainty for qubit measurements

@article{Busch2013HeisenbergUF,  title={Heisenberg uncertainty for qubit measurements},  author={Paul Busch and Pekka Lahti and Reinhard F. Werner},  journal={Physical Review A},  year={2013},  volume={89},  pages={012129},  url={https://api.semanticscholar.org/CorpusID:118383022}}
Reports on experiments recently performed in Vienna [Erhard et al, Nature Phys. 8, 185 (2012)] and Toronto [Rozema et al, Phys. Rev. Lett. 109, 100404 (2012)] include claims of a violation of Heisenberg's error-disturbance relation. In contrast, we have presented and proven a Heisenberg-type relation for joint measurements of position and momentum [Phys. Rev. Lett. 111, 160405 (2013)]. To resolve the apparent conflict, we formulate here a new general trade-off relation for errors in qubit… 

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