Nonlocal bunching of composite bosons

TL;DR

This paper investigates whether spatially separated entangled fermion pairs can exhibit bosonic behavior, proposing a nonlocal bunching scenario where such pairs form an analogue of a bosonic Fock state.

Contribution

It introduces a nonlocal bunching scenario demonstrating that entangled fermion pairs can mimic bosonic properties under certain conditions.

Findings

Entangled fermion pairs can exhibit bosonic bunching behavior.

A nonlocal scenario enables fermion pairs to form bosonic-like states.

Spatial separation does not preclude bosonic properties in entangled systems.

Abstract

It was suggested that two entangled fermions can behave like a single boson and that the bosonic quality is proportional to the degree of entanglement between the two particles. The relation between bosonic quality and entanglement is quite natural if one takes into account the fact that entanglement appears in bound states of interacting systems. However, entanglement can still be present in spatially separated subsystems that do not interact anymore. These systems are often a subject of studies on quantum nonlocality and foundations of quantum physics. Here, we ask whether an entangled spatially separated fermionic pair can exhibit bosonic properties. We show that in certain conditions the answer to this question can be positive. In particular, we propose a nonlocal bunching scenario in which two such pairs form an analogue of a two-partite bosonic Fock state.