Remote entanglement generation via enhanced quantum state transfer

TL;DR

This paper introduces a zig-zag quantum state transfer scheme with a tunable parameter that reduces losses and enhances remote entanglement generation, demonstrated on superconducting processors with improved error rates.

Contribution

A novel zig-zag configuration for quantum state transfer with a controllable parameter, improving robustness and reducing errors in remote entanglement generation.

Findings

Achieved 18% error reduction in remote Bell state generation.

Demonstrated robustness against certain noise types.

Extended scheme to 2D networks for W state generation.

Abstract

Achieving robust and scalable remote quantum entanglement is a fundamental challenge for the development of distributed quantum networks and modular quantum computing systems. Along this, perfect state transfer (PST) and fractional state transfer (FST) have emerged as promising schemes for quantum state transfer and remote entanglement generation using only nearest-neighbor couplings. However, the current implementations suffer from quantum loss and limited parameter tunability. In this work, we propose a new quantum state transfer scheme based on a zig-zag configuration, which introduces a controlling parameter for PST and FST. We show that this new parameter can suppress the population in the intermediate qubits, thereby reducing losses. We experimentally demonstrate the dynamics of different configurations on a superconducting quantum processor, achieving an $18\%$ reduction in error for remote Bell state generation in a 1D ($1\times5$) qubit chain, and exhibit robustness against certain types of noise. Then we extend our approach to a 2D network, successfully generating a W state among the four corner qubits. These results highlight the potential of our enhanced quantum state transfer scheme for scalable and noise-resilient quantum communication and computing.