The arrow of time in operational formulations of quantum theory
Abstract
The operational formulations of quantum theory are drastically time oriented. However, to the best of our knowledge, microscopic physics is timesymmetric. We address this tension by showing that the asymmetry of the operational formulations does not reflect a fundamental timeorientation of physics. Instead, it stems from builtin assumptions about the $users$ of the theory. In particular, these formalisms are designed for predicting the future based on information about the past, and the main mathematical objects contain implicit assumption about the past, but not about the future. The main asymmetry in quantum theory is the difference between knowns and unknowns.
 Publication:

arXiv eprints
 Pub Date:
 October 2020
 arXiv:
 arXiv:2010.05734
 Bibcode:
 2020arXiv201005734D
 Keywords:

 Quantum Physics
 EPrint:
 16 pages + references, a few diagrams. This version is to appear in Quantum. Title has changed, it used to be "Quantum information and the arrow of time''