Reply to the Comment on 'The operational foundations of PT-symmetric and quasi-Hermitian quantum theory'

This document is our reply to the Comment (Miloslav Znojil 2023 J. Phys. A: Math. Theor. 56 038001) on our recent work titled 'The operational foundations of PT-symmetric and quasi-Hermitian quantum theory'. The original Comment consists of three addenda to our work. The first addendum claims that our work is ill-motivated as the motivating question, namely whether PT-symmetric quantum theory extends the standard quantum theory, was already answered in the literature. The second addendum points to some missing references in our work, and the third addendum suggests what constraints could lead to an extension of standard quantum theory. In our reply, we explain that the claim in the first addendum is a result of a misinterpretation of our motivating question. When interpreted correctly, the third addendum in the Comment in itself elaborates on why our motivating question is interesting and relevant. We also briefly comment on the prospects of an extension of standard quantum theory along the lines suggested in the third addendum. As our response to the second addendum, we explain our rationale behind citing certain references while leaving out others.

Automated summary

This document is a response to a comment on our recent work titled 'The operational foundations of PT-symmetric and quasi-Hermitian quantum theory'. The comment consists of three addenda, addressing the motivation, references, and constraints of our work. We clarify the misinterpretation in the first addendum and highlight the relevance of our motivating question in the third addendum. Additionally, we explain our rationale for citing specific references in response to the second addendum.