Interactions of pre- and postselected quantum particles
Quantum Physics
2026-03-17 v2
Abstract
An approach for analysis of effective interaction between pre- and postselected quantum particles is developed. It is argued that the cases of complete pre- and postselection of particles are more profound than the cases of partial pre- and postselection, since the former goes beyond modification of the average of interactions on an ensemble of experiments. Recently discussed paradoxical phenomena such as the pigeonhole paradox and the modification of the interaction from repulsion to attraction are analyzed within the introduced formalism, and a few new surprising examples are presented.
Keywords
Cite
@article{arxiv.2512.18907,
title = {Interactions of pre- and postselected quantum particles},
author = {Gregory Reznik and Jan Dziewior and Shrobona Bagchi and Lev Vaidman},
journal= {arXiv preprint arXiv:2512.18907},
year = {2026}
}
Comments
The manuscript has been accepted for publication in Physical Review A