Hybrid nanodiamond-YIG systems for efficient quantum information processing and nanoscale sensing

TL;DR

This paper introduces a hybrid YIG-nanodiamond system that uses spin-waves in ferromagnets to enhance and mediate long-range quantum interactions, improving quantum information processing and sensing capabilities.

Contribution

It presents a novel hybrid system utilizing YIG spin-waves to amplify microwave fields and facilitate coherent interactions with NV centers, overcoming proximity limitations.

Findings

YIG spin-waves amplify microwave fields by over 100 times.

Efficient long-range coherent interactions between NV centers mediated by spin-waves.

Potential for improved quantum networks and nanoscale sensing devices.

Abstract

The nitrogen-vacancy (NV) center in diamond has been extensively studied in recent years for its remarkable quantum coherence properties that make it an ideal candidate for room temperature quantum computing and quantum sensing schemes. However, these schemes rely on spin-spin dipolar interactions, which require the NV centers to be within a few nanometers from each other while still separately addressable, or to be in close proximity of the diamond surface, where their coherence properties significantly degrade. Here we demonstrate a method for overcoming these limitations using a hybrid yttrium iron garnet (YIG)-nanodiamond quantum system constructed with the help of directed assembly and transfer printing techniques. We show that YIG spin-waves can amplify the oscillating field of a microwave source by more than two orders of magnitude and efficiently mediate its coherent interactions with an NV center ensemble. These results demonstrate that spin-waves in ferromagnets can be used as quantum buses for enhanced, long-range qubit interactions, paving the way to ultra-efficient manipulation and coupling of solid state defects in hybrid quantum networks and sensing devices.