Apparent quantum paradoxes as simple interference: Quantum violation of the pigeonhole principle and exchange of properties between quantum particles

TL;DR

This paper interprets recent quantum paradoxes, including the violation of the pigeonhole principle and property exchange, as simple interference effects, providing clearer physical insights and demystifying their seemingly paradoxical conclusions.

Contribution

It offers a unified interference-based explanation for quantum paradoxes, clarifying their physical origins and challenging their interpretation as violations of classical principles.

Findings

Quantum pigeonhole effect explained as interference of force

Property exchange between particles viewed as interference phenomena

Clarification that these effects do not imply true paradoxes or violations

Abstract

It was recently argued that the pigeonhole principle, which states that if three pigeons are put into two pigeonholes then at least one pigeonhole must contain more than one pigeon, is violated in quantum systems [Y. Aharonov et al., PNAS 113, 532 (2016)]. An experimental verification of this effect was recently reported [M.-C. Chen et al., PNAS 116, 1549 (2019)]. In another recent experimental work, it was argued that two entities were observed to exchange properties without meeting each other [Z.-H. Liu et al., Nat. Commun. 11, 3006 (2020)]. Here we describe all these proposals and experiments as simple quantum interference effects, where no such dramatic conclusions appear. Besides demystifying some of the conclusions of the cited works, we also present physical insights for some interesting behaviors present in these treatments. For instance, we associate the anomalous particles behaviors in the quantum pigeonhole effect to a quantum interference of force.