Single-step transfer or exchange of multipartite quantum entanglement with minimum resources

TL;DR

This paper demonstrates that a single quantum two-level system can efficiently transfer or exchange multipartite quantum states between two qubit sets, minimizing resource use for quantum networks.

Contribution

It introduces a method to transfer or exchange multipartite entanglement using only one quantum coupler, reducing resource requirements.

Findings

Multipartite states can be transferred or exchanged simultaneously.

A single two-level system suffices as the coupler.

Resource efficiency is significantly improved.

Abstract

The transfer or exchange of multipartite quantum states is critical to the realization of large-scale quantum information processing and quantum communication. A challenging question in this context is: What is the minimum resource required and how to simultaneously transfer or exchange multipartite quantum entanglement between two sets of qubits. Finding the answer to these questions is of great importance to quantum information science. In this work, we demonstrate that by using a single quantum two-level system - the simplest quantum object - as a coupler arbitrary multipartite quantum states (either entangled or separable) can be transferred or exchanged simultaneously between two sets of qubits. Our findings offer the potential to significantly reduce the resources needed to construct and operate large-scale quantum information networks consisting of many multi-qubit registers, memory cells, and processing units.