Entanglement Generation During Distribution via Spatial Superposition

TL;DR

This paper demonstrates that spatial superposition of communication links can generate entanglement during distribution, turning noise into a resource for quantum networks.

Contribution

It introduces a method to deterministically create entanglement from separable states via coherent superposition of noisy links, advancing quantum communication techniques.

Findings

Separable states can be transformed into entangled states during distribution.

Quantum noise can be harnessed as a resource for entanglement generation.

The approach is feasible with interferometric setups.

Abstract

The exploitation of quantum coherence at the level of propagation represents a powerful paradigm for quantum communication networks. In this work, we show that the coherent superposition of spatially distinct communication links enables entanglement generation inherently during distribution. Specifically, separable quantum states can be deterministically transformed into entangled states, when the noisy communication links they traverse are coherently superposed. Contrary to the conventional view of noise as a detrimental effect, we demonstrate that quantum noise itself can be transformed into a constructive resource for entanglement generation for both bipartite and multipartite entanglement. Given the practical feasibility of implementing spatial superposition in interferometric setups, our approach provides a feasible method for distributed entanglement engineering, opening new directions for quantum communication and networked quantum technologies.