Experimental realization of state transfer by quantum walks with two coins

TL;DR

This paper demonstrates the experimental implementation of quantum state transfer using quantum walks with two coins on IBM quantum devices, successfully transferring entangled states with high fidelity across various graphs.

Contribution

It is the first experimental realization of quantum state transfer via quantum walks with two coins on a real quantum computer.

Findings

Successful transfer of Bell, GHZ, and W states on complete graphs.

High fidelity of state transfer confirmed by quantum state tomography.

Experimental validation of quantum walk-based state transfer protocols.

Abstract

Quantum state transfer between different sites is a significant problem for quantum networks and quantum computers. By selecting quantum walks with two coins as the basic model and two coin spaces as the communication carriers, we successfully implement quantum state transfer on various graphs (EPL, \textbf{124} (2018) 60009) \cite{Shang_2019}. Here, we demonstrate the experimental implementation of this scheme using IBM quantum experience platform. In particular, we show the transfer of Bell state, GHZ state and W state on complete graph on the quantum device. Also, we observe that our protocol has high fidelity by preforming quantum state tomography.