Engineering coherent interactions in molecular nanomagnet dimers

TL;DR

This paper demonstrates the scalable construction of two-qubit molecular spin structures using chemical self-assembly, maintaining coherence and enabling control over quantum interactions for quantum gate implementation.

Contribution

It introduces a method to assemble scalable two-qubit molecular structures with preserved coherence and tunable interactions, advancing molecular quantum computing.

Findings

Constructed multiple two-qubit structures with Cr7Ni spin qubits.

Maintained long coherence times across structures.

Achieved control over inter-qubit quantum interactions.

Abstract

Proposals for systems embodying condensed matter spin qubits cover a very wide range of length scales, from atomic defects in semiconductors all the way to micron-sized lithographically-defined structures. Intermediate scale molecular components exhibit advantages of both limits: like atomic defects, large numbers of identical components can be fabricated; as for lithographically defined structures, each component can be tailored to optimize properties such as quantum coherence. Here, we demonstrate what is perhaps the most potent advantage of molecular spin qubits, the scalability of quantum information processing structures using bottom-up chemical self-assembly. Using Cr7Ni spin qubit building blocks, we have constructed several families of two-qubit molecular structures with a range of linking strategies. For each family, long coherence times are preserved, and we demonstrate control over the inter-qubit quantum interactions that can be used to mediate two-qubit quantum gates.