Predicted strong coupling of solid-state spins via a single magnon mode

Abstract

We propose an approach to realize a hybrid quantum system composed of a diamond nitrogen-vacancy (NV) center spin coupled to a magnon mode of the low-damping, low-moment organic ferrimagnet vanadium tetracyanoethylene. We derive an analytical expression for the spin-magnon cooperativity as a function of NV position under a micron-scale perpendicularly magnetized disk, and show that, surprisingly, the cooperativity will be higher using this magnetic material than in more conventional materials with larger magnetic moments, due to in part to the reduced demagnetization field. For reasonable experimental parameters, we predict that the spin-magnon-mode coupling strength is g ∼ 2π×10 kHz. For isotopically pure 12C diamond we predict strong coupling of an NV spin to the unoccupied magnon mode, with cooperativity C λ = 15 for a wide range of NV spin locations within the diamond, well within the spatial precision of NV center implantation. Thus our proposal describes a practical pathway for single-spin-state-to-single-magnon-occupancy transduction and for entangling NV centers over micron length scales.

Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

“…Therefore, the coherence times presented herein are fully compatible with applications in quantum sensing and hybrid quantum systems. 47 , 50 , 51 …”

Octave-Tunable Magnetostatic Wave YIG Resonators on a Chip

“…The f × Q product of these devices is significantly higher than their acoustic counterparts. The small device size made possible by our novel fabrication process and transducer design enables single-chip integration of multifrequency devices, which facilitates the realization of chip-scale high-order MSW filters, multiplexers, circulators [22], microwave-to-optical converters [23], and quantum coherent spin-magnon transducer [24]. The YIG micromachining process and resonator design are not limited to the GGG substrate.…”

Free-space confocal magneto-optical spectroscopies at milliKelvin temperatures

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