Can single-world interpretations of quantum theory be self-consistent?
I saw a provocative-looking paper on the arXiv the other day (by Daniela Frauchiger and Renato Renner) with the title Single-world interpretations of quantum theory cannot be self-consistent. No doubting what the authors think!
Here’s the abstract:
According to quantum theory, a measurement may have multiple possible outcomes. Single-world interpretations assert that, nevertheless, only one of them “really” occurs. Here we propose a gedankenexperiment where quantum theory is applied to model an experimenter who herself uses quantum theory. We find that, in such a scenario, no single-world interpretation can be logically consistent. This conclusion extends to deterministic hidden-variable theories, such as Bohmian mechanics, for they impose a single-world interpretation.
Since this is a subject we’ve had interesting debates about on this blog I thought I’d post a link to it here and see if anyone would like to respond through the comments. I haven’t had time to read it thoroughly yet, but I do have a bit of train travel to do tomorrow…Follow @telescoper