I will describe our experiments driving spin and orbital resonance of diamond nitrogen-vacancy (NV) centers using the gigahertz-frequency strain oscillations produced within a diamond bulk acoustic resonator. Strain-based coupling between a resonator and a defect center takes advantage of intrinsic coupling mechanisms while maintaining compatibility with conventional magnetic and optical techniques. We demonstrate coherent spin control over both double quantum (Δm=±2) and single quantum (Δm=±1) transitions, providing opportunities for quantum sensing and protection of spin coherence. At cryogenic temperatures, we use orbital-strain interactions driven by a diamond acoustic resonator to study multi-phonon orbital resonance of a single NV center.
I will describe our experiments to drive spin and orbital resonance of single diamond nitrogen-vacancy (NV) centers using the gigahertz-frequency strain oscillations produced within a diamond acoustic resonator. Strain-based coupling between a resonator and a defect center takes advantage of intrinsic and reproducible coupling mechanisms while maintaining compatibility with conventional magnetic and optical techniques, thus providing new functionality for quantum-enhanced sensing and quantum information processing. Using a spin-strain interaction at room temperature, we demonstrate coherent spin control and spin coherence protection. At cryogenic temperatures, we use orbital-strain interactions driven by a diamond acoustic resonator to study multi-phonon orbital resonance of a single NV center. Additionally, I’ll describe our efforts to enhance electron-phonon coupling by engineering mechanical resonators with small modal volumes based a semi-confocal acoustic cavity.
The generation of single photons with tunable, high spectral and single-photon purity are essential building blocks of quantum photonic technologies. I will discuss our progress on making high-quality single photon sources based on van der Waals materials including monolayers of WSe2 and hBN defects. In WSe2 we show very spectrally clean emission of high-purity single photons at a strain point in the wrinkles of hBN/WSe2 bilayers, cleaner than the single photon emission at substrate-defined nanopillars. We also study dynamic strain via the integration of ion-beam created hBN defects with drumhead mechanical resonators and study their optical properties.
Here, we predict a strong coherent coupling in the quantum regime between V[TCNE]x magnons [1,2] and spin coherent NV center levels. First, we calculate analytically the magnon dispersion and fringe field and obtain a NV spin-magnon coupling strength of 8.7 kHz for a disk of diameter 1 μm. Secondly, we derive an analytical expression for the cooperativity as a function of NV center position for a general magnetic disk on top of the diamond substrate. Using realistic coherence times of both NV centers and V[TCNE]x magnons, we predict cooperativity C ≈ 6 for NV centers placed within a wide spatial region. Thus our proposal provides an avenue for coupling between NV centers separated by ≈1 μm. The material is based on work supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Award Number DE-SC0019250. [1] Na Zhu, et. al., Applied Physics Letters 109, 082402 (2016). [2] A. Franson, et. al., APL Materials 7, 121113 (2019).
Conference Committee Involvement (1)
Photonics for Quantum
12 July 2021 | Online Only, New York, United States
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