  In a recent publication [PRL 111, 160405 (2013)] we proved a version of
Heisenberg's error-disturbance tradeoff. This result was in apparent
contradiction to claims by Ozawa of having refuted these ideas of Heisenberg.
In a direct reaction [arXiv:1308.3540] Ozawa has called our work groundless,
and has claimed to have found both a counterexample and an error in our proof.
Here we answer to these allegations. We also comment on the submission
[arXiv:1307.3604] by Rozema et al, in which our approach is unfavourably
compared to that of Ozawa.
