Decoherence of intermolecular entanglement in exchange-coupled nanomagnets

TL;DR

This paper studies how hyperfine interactions cause decoherence in exchange-coupled nanomagnet qubits and demonstrates that dynamical decoupling can significantly recover entanglement coherence.

Contribution

It identifies two regimes of decoherence in heterometallic wheel spin qubits and shows how chemical and physical factors influence decoherence times, with potential for control.

Findings

Two distinct decoherence regimes identified

Dynamical decoupling substantially recovers entanglement

Chemical elements and processes affect decoherence times

Abstract

We theoretically investigate the hyperfine-induced decoherence in a pair of spin-cluster qubits, consisting of two exchange-coupled heterometallic wheels. We identify two distinct regimes in the decoherence of intermolecular entanglement and show that this can be substantially recovered through dynamical decoupling. Different chemical elements and physical processes are responsible for the decoherence of the singlet-triplet superposition, resulting in a wider tunability of its decoherence time.