On dynamical stability of composite quantum particles: when entanglement is enough and when interaction is needed

We consider an evolution of two elementary quantum particles and ask the question: under what conditions such a system behaves as a single object? It is obvious that if the attraction between the particles is stronger than any other force acting on them the whole system behaves as one. However, rece...

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Bibliographic Details
Published inarXiv.org
Main Authors Lasmar, Zakarya, Sajna, Adam S, Su-Yong, Lee, Kurzynski, Pawel
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 20.08.2018
Subjects
Attraction
Dynamic stability
Information theory
Particulate composites
Quantum entanglement
Quantum phenomena
Subsystems
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Summary:We consider an evolution of two elementary quantum particles and ask the question: under what conditions such a system behaves as a single object? It is obvious that if the attraction between the particles is stronger than any other force acting on them the whole system behaves as one. However, recent insight from the quantum information theory suggests that in bipartite systems it is not attraction per se that is responsible for the composite nature, but the entanglement between the parts. Since entanglement can be present between the subsystems that interacted in the past, but do not interact anymore, it is natural to ask when such an entangled pair behaves as a single object. We show that there are situations when entanglement is enough to observe single-particle behaviour. However, due to the no-signalling condition, in general an interaction, or a post-selective measurement, is necessary for a complex collective behaviour.
ISSN:2331-8422