Communication in quantum networks of logical bus topology

TL;DR

This paper investigates conditions for perfect quantum state transfer in passive quantum networks with a logical bus topology, enabling multiple nodes to communicate via shared media without external control.

Contribution

It identifies conditions under which point-to-point PST links can be combined to design multi-node quantum networks with deterministic state transfer.

Findings

Conditions for PST in logical bus topology networks

Implications for Hamiltonians enabling deterministic PST

Framework for multi-node quantum communication networks

Abstract

Perfect state transfer (PST) is discussed in the context of passive quantum networks with logical bus topology, where many logical nodes communicate using the same shared media, without any external control. The conditions under which, a number of point-to-point PST links may serve as building blocks for the design of such multi-node networks are investigated. The implications of our results are discussed in the context of various Hamiltonians that act on the entire network, and are capable of providing PST between the logical nodes of a prescribed set in a deterministic manner.