Quantum Teamwork for Unconditional Multiparty Communication with Gaussian States

TL;DR

This paper introduces a quantum teamwork protocol using Gaussian states that enables reliable multipartite quantum communication among multiple users, regardless of team arrangements, leveraging special entangled Gaussian states.

Contribution

It presents a novel quantum teamwork protocol utilizing Gaussian states for unconditional multipartite communication, including the construction of N-mode Gaussian weighted graph states.

Findings

Existence of N-mode Gaussian weighted graph states for any N

Unconditional quantum teamwork implementation possible with these states

Gaussian states are robust against entanglement frustration in multiqubit states

Abstract

We demonstrate the capability of continuous variable Gaussian states to communicate multipartite quantum information. A quantum teamwork protocol is presented according to which an arbitrary possibly entangled multimode state can be faithfully teleported between two teams each comprising many cooperative users. We prove that N-mode Gaussian weighted graph states exist for arbitrary N, that enable unconditional quantum teamwork implementations for any arrangement of the teams. These perfect continuous variable maximally multipartite entangled resources are typical among pure Gaussian states and are unaffected by the entanglement frustration occurring in multiqubit states.