Entanglement manipulation through multicore fibres

TL;DR

This paper demonstrates that multicore fibres can generate entangled states, including bound entangled states, by leveraging crosstalk among cores, thus advancing their use in scalable quantum networks.

Contribution

It introduces a protocol to generate bound entangled states using multicore fibres and models the fibre as a quantum channel with crosstalk as a key resource.

Findings

Multicore fibres can generate entangled states via crosstalk.

A protocol for creating bound entangled states is proposed.

Crosstalk is essential for entanglement generation in this setup.

Abstract

Multicore fibres are recently gaining considerable attention in the context of quantum communication tasks, where their capability to transmit multiple quantum states along different cores of the same channel make them a promising candidate for the implementation of scalable quantum networks. Here, we show that multicore fibres can be effectively used not only for the scope of communication but also for the generation of entangled states. By exploiting the formalism of completely positive trace preserving maps, we describe the action of a multicore fibre as a quantum channel and propose a protocol to implement bound entangled states of two qudits. Notably, the presence of crosstalk among the cores of the fibre is fundamental for the generation of such states.