A5075315520- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Electronic and Structural Properties of Oxides
- Quantum and electron transport phenomena
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Semiconductor materials and devices
- Quantum Information and Cryptography
- Magnetic properties of thin films
- Carbon Nanotubes in Composites
- Physics of Superconductivity and Magnetism
- Metal and Thin Film Mechanics
- Characterization and Applications of Magnetic Nanoparticles
- Quantum many-body systems
- Iron-based superconductors research
- Advanced Materials Characterization Techniques
- Ion-surface interactions and analysis
- Advanced MEMS and NEMS Technologies
- Quantum Computing Algorithms and Architecture
- Geophysics and Sensor Technology
- Laser-induced spectroscopy and plasma
- Magnetic Properties of Alloys
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced MRI Techniques and Applications
University of California, Santa Barbara
2015-2024
Harvard University
2008-2023
University of California, Berkeley
2023
Stanford University
2020-2023
California NanoSystems Institute
2014
Yale University
2008-2013
Mechanical systems can be influenced by a wide variety of small forces, ranging from gravitational to optical, electrical, and magnetic. When mechanical resonators are scaled down nanometer-scale dimensions, these forces harnessed enable coupling individual quantum systems. We demonstrate that the coherent evolution single electronic spin associated with nitrogen vacancy center in diamond coupled motion magnetized resonator. Coherent manipulation is used sense driven Brownian resonator under...
The development of hybrid quantum systems is central to the advancement emerging technologies, including information science and quantum-assisted sensing. recent demonstration high-quality single-crystal diamond resonators has led significant interest in a system consisting nitrogen-vacancy centre spins that interact with resonant phonon modes macroscopic mechanical resonator through crystal strain. However, spin-strain interaction not been well characterized. Here, we demonstrate dynamic,...
Quantum mechanics predicts that the equilibrium state of a resistive metal ring will contain dissipationless current. This persistent current has been focus considerable theoretical and experimental work, but its basic properties remain topic controversy. The main challenges in studying currents have small signals they produce their exceptional sensitivity to environment. We developed technique for detecting allows us measure rings over wide range temperatures, sizes, magnetic fields....
We demonstrate nanometer-precision depth control of nitrogen-vacancy (NV) center creation near the surface synthetic diamond using an in situ nitrogen delta-doping technique during plasma-enhanced chemical vapor deposition. Despite their proximity to surface, doped NV centers with depths (d) ranging from 5 100 nm display long spin coherence times, T2 > μs at d = and 600 ≥ 50 nm. The consistently observed such shallow enables applications as atomic-scale external sensing hybrid quantum architectures.
The most direct approach for characterizing the quantum dynamics of a strongly interacting system is to measure time evolution its full many-body state. Despite conceptual simplicity this approach, it quickly becomes intractable as size grows. An alternate think generating noise, which can be measured by decoherence probe qubit. Here we investigate what such tells us about system. In particular, utilize optically addressable spins experimentally characterize both static and dynamical...
We have measured the optical and mechanical loss of commercial silicon nitride membranes. find that 50nm thick, 1mm2 membranes Q>106 at 293K, Q>107 300mK, well above what has been observed in devices with comparable dimensions. The near-IR 293K is less than 2×10−4. This combination properties make these attractive candidates for studying quantum effects optomechanical systems.
Sensitive nanoscale magnetic resonance imaging of target spins using nitrogen-vacancy (NV) centers in diamond requires a quantitative understanding dominant noise at the surface. We probe this by applying dynamical decoupling to shallow NVs calibrated depths. Results support model NV dephasing surface bath electronic having correlation rate 200 kHz, much faster than that bulk N spin bath. Our method combining nitrogen delta-doping growth and depth paves way for studying present diverse...
There has been rapidly growing interest in hybrid quantum devices involving a solid-state spin and macroscopic mechanical oscillator.Such create exciting opportunities to mediate interactions between disparate qubits explore the regime of objects.In particular, system consisting nitrogen-vacancy defect center diamond coupled high quality factor oscillator is an appealing candidate for such device, as it utilizes highly coherent versatile properties center.In this paper, we will review recent...
The charge degree of freedom in solid-state defects fundamentally underpins the electronic spin freedom, a workhorse quantum technologies. Here we study state properties individual near-surface nitrogen-vacancy (NV) centers diamond, where NV$^{-}$ hosts metrologically relevant electron spin. We find that initialization fidelity varies between and over time, alleviate deleterious effects reduced via logic-based initialization. also can ionize dark, which compromises measurements but is...
Nanomechanical sensors and quantum nanosensors are two rapidly developing technologies that have diverse interdisciplinary applications in biological chemical analysis microscopy. For example, nanomechanical based upon nanoelectromechanical systems (NEMS) demonstrated chip-scale mass spectrometry capable of detecting single macromolecules, such as proteins. Quantum electron spins negatively-charged nitrogen-vacancy (NV) centers diamond modes nanometrology, including molecule magnetic...
We demonstrate fully three-dimensional and patterned localization of nitrogen-vacancy (NV) centers in diamond with coherence times excess 1 ms. Nitrogen {\delta}-doping during CVD growth vertically confines nitrogen to 4 nm while electron irradiation a transmission microscope (TEM) laterally vacancies less than {\mu}m. characterize the effects energy dose on NV formation. Importantly, our technique enables formation reliably high-quality inside nanostructures, applications quantum...
Magnetic skyrmions as swirling spin textures with a nontrivial topology have potential applications magnetic memory and storage devices. Since the initial discovery of in non-centrosymmetric B20 materials, recent effort has focused on exploring room-temperature heavy metal ferromagnetic heterostructures, material platform compatible existing spintronic manufacturing technology. Here, we report surprising observation that skyrmion phase can be stabilized an entirely different class systems...
We probe the relaxation dynamics of full three-level spin system near-surface nitrogen-vacancy (NV) centers in diamond to define a T_{1} time that sets T_{2}≤2T_{1} coherence limit NV's subset qubit superpositions. find double-quantum via electric field noise dominates NVs at low applied magnetic fields. Furthermore, we differentiate 1/f^{α} spectra and using novel noise-spectroscopy technique, with broad applications probing surface-induced decoherence material interfaces.
The electrical conductivity of a material can feature subtle, non-trivial, and spatially varying signatures with critical insight into the material's underlying physics. Here we demonstrate imaging technique based on atom-sized nitrogen-vacancy (NV) defect in diamond that offers local, quantitative, non-invasive nanoscale spatial resolution. We monitor spin relaxation rate single NV center scanning probe geometry to quantitatively image magnetic fluctuations produced by thermal electron...
Single-crystal diamond is a promising material for MEMs devices because of its low mechanical loss, compatibility with extreme environments, and built-in interface to high-quality spin centers. But use has largely been limited by challenges in processing growth. We demonstrate wafer bonding-based technique form on insulator, from which we make single-crystal micromechanical resonators quality factors as high 338,000 at room temperature. Variable temperature measurements down 10 K reveal...
Abstract Effective methods to generate colour centres in diamond and other wide band-gap materials are essential the realisation of solid state quantum technologies based on such systems. Such have been subject intensive research effort recent years. In this review, we bring together various techniques used generation positioning diamond: ion implantation, delta-doping, electron irradiation, laser writing thermal annealing. We assess roles merits each these formation for different consider...
Ohm's law describes the proportionality of current density and electric field. In solid-state conductors, emerges due to electron scattering processes that relax electrical current. Here, we use nitrogen-vacancy center magnetometry directly image local breakdown in a narrow constriction fabricated high mobility graphene monolayer. Ohmic flow is visible at room temperature as concentration on edges, with profiles entirely determined by sample geometry. However, lowered below 200 K,...
The negatively charged nitrogen vacancy center (NV) in diamond has generated significant interest as a platform for quantum information processing and sensing the solid state. For most applications, high quality optical cavities are required to enhance NV zero-phonon line (ZPL) emission. An outstanding challenge maximizing degree of NV-cavity coupling is deterministic placement NVs within cavity. Here, we report photonic crystal nanobeam coupled incorporated by delta-doping technique that...
Spin-labeling of molecules with paramagnetic ions is an important approach for determining molecular structure, however current ensemble techniques lack the sensitivity to detect few isolated spins. In this Letter, we demonstrate two-dimensional nanoscale imaging gadolinium compounds using scanning relaxometry a single nitrogen vacancy (NV) center in diamond. Gadopentetate dimeglumine attached atomic force microscope tip controllably interacted and detected by NV center, virtue fact that...
The recent maturation of hybrid quantum devices has led to significant enhancements in the functionality a wide variety systems. In particular, harnessing mechanical resonators for manipulation and control expanded use two-level systems information science sensing. this letter, we report on monolithic device which strain fields associated with resonant vibrations diamond cantilever dynamically optical transitions single nitrogen-vacancy (NV) defect center diamond. We quantitatively...
We demonstrate three-dimensional localization of a single nitrogen-vacancy (NV) center in diamond by combining nitrogen doping during growth with post-growth 12C implantation technique that facilitates vacancy formation the crystal. show NV density can be controlled dose without necessitating increase incorporation. By implanting large through nanoscale apertures, we localize an individual within volume (~180 nm)**3 at deterministic position while reproducibly preserving coherence time (T2)...