Perfect state transfer and efficient quantum routing: a discrete-time quantum walk approach

TL;DR

This paper demonstrates perfect transfer and routing of arbitrary multi-qubit states using discrete-time quantum walks, offering a scalable method for quantum communication in complex networks.

Contribution

It introduces a novel quantum walk-based approach for perfect state transfer and routing of multi-qubit states in multi-dimensional networks.

Findings

Achieves perfect transfer of arbitrary two-qubit states.

Extends method to distribute multi-qubit entangled states.

Proposes quantum walk architecture for quantum information routing.

Abstract

We show a perfect state transfer of an arbitrary unknown two-qubit state can be achieved via a discrete-time quantum walk with various settings of coin flippings, and extend this method to distribution of an arbitrary unknown multi-qubit entangled state between every pair of sites in the multi-dimensional network. Furthermore, we study the routing of quantum information on this network in a quantum walk architecture, which can be used as quantum information processors to communicate between separated qubits.