Long-range spin wave mediated control of defect qubits in nanodiamonds

作者：Paolo Andrich, Charles F. de las Casas, Lanying Li, Hope L. Bretscher, Jonson R. Berman, F. Joseph Heremans, Paul F. Nealey, D. D. Awschalom · 发表于：npj Quantum Information · 年份：2017 · DOI：10.1038/s41534-017-0029-z · 被引用次数：156 · 研究领域：Diamond and Carbon-based Materials Research、Advanced Fiber Laser Technologies、Force Microscopy Techniques and Applications

Abstract Hybrid architectures that combine nitrogen-vacancy centers in diamond with other materials and physical systems have been proposed to enhance the nitrogen-vacancy center’s capabilities in many quantum sensing and information applications. In particular, spin waves in ferromagnetic materials are a promising candidate to implement these platforms due to their strong magnetic fields, which could be used to efficiently interact with the nitrogen-vacancy centers. Here, we develop an yttrium iron garnet-nanodiamond hybrid architecture constructed with the help of directed assembly and transfer printing techniques. Operating at ambient conditions, we demonstrate that surface confined spin waves excited in the ferromagnet can strongly amplify the interactions between a microwave source and the nitrogen-vacancy centers by enhancing the local microwave magnetic field by several orders of magnitude. Crucially, we show the existence of a regime in which coherent interactions between spin waves and nitrogen-vacancy centers dominate over incoherent mechanisms associated with the broadband magnetic field noise generated by the ferromagnet. These accomplishments enable the spin wave mediated coherent control of spin qubits over distances larger than 200 μm, and allow low power operations for future spintronic technologies.