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

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