Post-selection induced deterministic and probabilistic entanglement with strong and weak interactions

TL;DR

This paper presents a scheme to generate entanglement between two non-interacting systems using an ancillary particle and post-selection, achieving deterministic entanglement with strong interactions and probabilistic entanglement with weak interactions.

Contribution

It introduces a novel post-selection method in a Mach-Zehnder interferometer to entangle systems without direct interaction, applicable to both strong and weak coupling regimes.

Findings

Deterministic entanglement with strong interactions.

Probabilistic maximally entangled states with weak interactions.

Effective entanglement generation without direct system interaction.

Abstract

A scheme is proposed to entangle two systems that have not interacted by using an ancillary particle in a Mach-Zehnder interferometer, by making a suitable post--selection of the particle followed by a conditional feedback on one of the subsystems to be entangled. For a strong interaction, the process works deterministically. For a weaker interaction only the probability of success is reduced, but the output continues to be a maximally entangled state.