Generating Quantum States through Spin Chain Dynamics

TL;DR

This paper explores how engineered spin chains can generate a wide range of quantum states, including W-states, by controlling coupling strengths, expanding the potential for quantum information processing.

Contribution

It demonstrates that, aside from perfect state transfer, all single excitation states with full support can be generated, highlighting new capabilities of spin chain engineering.

Findings

All single excitation states with support on every site can be created.

W-states over the entire chain can be generated.

Spin chain engineering enables diverse quantum state preparation.

Abstract

Spin chains can realise perfect quantum state transfer between the two ends via judicious choice of coupling strengths. In this paper, we study what other states can be created by engineering a spin chain. We conclude that, up to local phases, all single excitation quantum states with support on every site of the chain can be created. We pay particular attention to the generation of W-states that are superposed over every site of the chain.