1. Magnetoelasticity for Integration of Quantum Defects
- Author
-
Jung, Adi
- Subjects
Electrical engineering ,ADFMR ,Atomic Defects ,Magnetoelasticity ,Nitrogen Vacancy Center ,ODMR ,Quantum Information - Abstract
Integration of atomic-defect spin qubits into memory or computing remains a challengingtask due to a range of engineering problems, including microwave power delivery and materialcompatibility. While approaches exploiting spin-wave dipolar coupling have been explored inthe past, they are reliant on Yttrium Iron Garnet (YIG), a model magnetic material whichdisplays long spin coherence length, but cannot be integrated on-chip except under relativelyrestrictive conditions. Therefore, despite a growth in research interest in recent years, suchhybrid quantum magnonic systems currently remain confined to laboratory conditions.In this thesis, I will present a method by which surface acoustic wave (SAW) driven magne-toelastic waves can be used as an effective near-field antenna for interfacing with spin qubits.Beginning with a set of experiments on resonant coupling of acoustic waves to magnetic dy-namics, we will show that the magnetoelastic interaction acts as linear method of conversionof acoustic waves into magnetic dynamics at high microwave power levels. Following this,experimental results demonstrating a dipolar coupling to the nitrogen-vacancy center in di-amond will be shown, along with a set of conditions under which this dipolar coupling isdominant over incoherent off-resonant coupling mechanisms. With these conditions iden-tified, we implement them and demonstrate the phase-coherent coupling of acoustic wavesto nitrogen-vacancy dynamics mediated by a magnetoelasticity in a ferromagnet. This ap-proach is in theory applicable across a wide range of materials, and offers the capabilityto integrate atomic qubits in a more power efficient manner compatible with commercialnanofabrication.
- Published
- 2023