A5025706101- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- Force Microscopy Techniques and Applications
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- High-pressure geophysics and materials
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Semiconductor materials and devices
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Nonlinear Optical Materials Studies
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Strong Light-Matter Interactions
- Carbon Nanotubes in Composites
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Thermal Radiation and Cooling Technologies
- Near-Field Optical Microscopy
- Quantum Mechanics and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Photorefractive and Nonlinear Optics
Princeton University
2017-2025
Weatherford College
2000-2022
Element Six (United Kingdom)
2022
University of Chicago
2021
University of California, Santa Barbara
2021
University of Wisconsin–Madison
2021
Harvard University
2006-2017
Case Western Reserve University
2016
University of Notre Dame
2014
Stanford University
2004-2005
Sensing single proteins with diamonds Nuclear magnetic resonance is a powerful technique for medical imaging and the structural analysis of materials, but usually associated large-volume samples. Lovchinsky et al. exploited properties spin defect in diamond manipulated it quantum-logic protocol. They demonstrated detection spectroscopy multiple nuclear species within individual ubiquitin attached to specially treated surface at room temperature. Science , this issue p. 836
Hybrid quantum devices, in which dissimilar systems are combined order to attain qualities not available with either system alone, may enable far-reaching control measurement, sensing, and information processing. A paradigmatic example is trapped ultracold atoms, offer excellent coherent properties, coupled nanoscale solid-state systems, allow for strong interactions. We demonstrate a deterministic interface between single rubidium atom photonic crystal cavity. Precise over the atom's...
A variety of nanoscale photonic, mechanical, electronic, and optoelectronic devices require scalable thin film fabrication. Typically, the device layer is defined by deposition on a substrate different material, optical or electrical isolation provided material properties removal substrate. For number materials this planar approach not feasible, new fabrication techniques are required to realize complex devices. Here, we report three-dimensional technique based anisotropic plasma etching at...
Engineering coherent systems is a central goal of quantum science. Color centers in diamond are promising approach, with the potential to combine coherence atoms scalability solid state platform. However, environment can adversely impact coherence. For example, phonon- mediated spin relaxation induce decoherence, and electric field noise change optical transition frequency over time. We report novel color center insensitivity both these sources environmental decoherence: neutral charge...
Efficient readout of individual electronic spins associated with atom-like impurities in the solid state is essential for applications quantum information processing and metrology. We demonstrate a new method efficient spin nitrogen-vacancy (NV) centers diamond. The based on conversion NV to charge distribution, followed by single-shot state. Conversion achieved through spin-dependent photoionization process diamond at room temperature. Using NVs nanofabricated beams, we that resulting noise...
We report the observation of stable optical transitions in nitrogen-vacancy (NV) centers created by ion implantation. Using a combination high temperature annealing and subsequent surface treatment, we reproducibly create NV with zero-phonon lines (ZPL) exhibiting spectral diffusion that is close to lifetime-limited line width. The residual further reduced using resonant pumping maintain NV– charge state. This approach allows for placement excellent coherence well-defined device layer, which...
The nitrogen-vacancy (NV) center in diamond exhibits spin-dependent fluorescence and long spin coherence times under ambient conditions, enabling applications quantum information processing sensing. NV centers near the surface can have strong interactions with external materials spins, new forms of nanoscale spectroscopy. However, degrades within 100 nm surface, suggesting that surfaces are plagued ubiquitous defects. Prior work on characterizing near-surface noise has primarily relied using...
The superconducting transmon qubit is a leading platform for quantum computing and science. Building large, useful systems based on qubits will require significant improvements in relaxation coherence times, which are orders of magnitude shorter than limits imposed by bulk properties the constituent materials. This indicates that likely originates from uncontrolled surfaces, interfaces, contaminants. Previous efforts to improve lifetimes have focused primarily designs minimize contributions...
The lifetime of superconducting qubits is limited by dielectric loss, and a major source loss the native oxide present at surface metal. Specifically, tantalum-based have been demonstrated with record lifetimes, but presence two-level systems in tantalum oxide. Here, we demonstrate strategy for avoiding formation encapsulating noble metals that do not form By depositing few nanometers Au or AuPd alloy before breaking vacuum, completely suppress formation. Microwave measurements resonators...
We investigated the effect of substrate-induced strain on metal−insulator transition (MIT) in single-crystalline VO2 nanobeams. A simple nanobeam−substrate adhesion leads to uniaxial along nanobeam length because nanobeam's unique morphology. The changes relative stability metal (M) and insulator (I) phases spontaneous formation periodic, alternating M−I domain patterns during MIT. spatial periodicity domains can be modified by changing thickness Young's modulus substrate.
The realization of efficient optical interfaces for solid-state atom-like systems is an important problem in quantum science with potential applications communications and information processing. We describe demonstrate a technique coupling single nitrogen vacancy (NV) centers to suspended diamond photonic crystal cavities quality factors up 6000. Specifically, we present enhancement the NV center's zero-phonon line fluorescence by factor ~ 7 low-temperature measurements.
We propose and demonstrate a new approach for achieving enhanced light-matter interactions with quantum emitters. Our makes use of plasmon resonator composed defect-free, highly crystalline silver nanowires surrounded by patterned dielectric distributed Bragg reflectors. These resonators have an effective mode volume (${V}_{\mathrm{eff}}$) 2 orders magnitude below the diffraction limit quality factor ($Q$) approaching 100, enabling enhancement spontaneous emission rates exceeding 75 at...
We demonstrate a method for efficient coupling of guided light from single mode optical fiber to nanophotonic devices.Our approach makes use single-sided conical tapered fibers that are evanescently coupled over the last ∼ 10 µm waveguide.By means adiabatic transfer using properly chosen taper, single-mode fiber-waveguide efficiencies as high 97(1)% achieved.Efficient is obtained wide range device geometries which either singly-clamped on chip or attached fiber, demonstrating promising...
Abstract Many advanced applications of diamond materials are now being limited by unknown surface defects, including in the fields high power/frequency electronics and quantum computing sensing. Of acute interest to researchers worldwide is loss coherence near‐surface nitrogen‐vacancy (NV) centers generation associated magnetic noise at surface. Here for first time presented observation a family primal which suggested as leading cause band‐bending Fermi‐pinning phenomena devices. A...
Quantum metrology enables some of the most precise measurements. In life sciences, diamond-based quantum sensing has enabled a new class biophysical sensors and diagnostic devices that are being investigated as platform for cancer screening ultra-sensitive immunoassays. However, broader application in sciences based on nanoscale nuclear magnetic resonance spectroscopy been hampered by need to interface highly sensitive bit (qubit) with their biological targets. Here, we demonstrate approach...
A detailed analysis of the coherence decay a nanoscale sensor shows that ubiquitous spins on diamond surface are mobile and reveals potential local sensors to investigate dynamics complex systems.
Erbium-doped materials can serve as spin-photon interfaces with optical transitions in the telecom $C$ band, making them an exciting class of for long-distance quantum communication. However, spin and coherence times ${\mathrm{Er}}^{3+}$ ions are limited by currently available host materials, motivating development new ${\mathrm{Er}}^{3+}$-containing materials. Here we demonstrate use ion implantation to efficiently screen prospective candidates, show that disorder introduced be mitigated...
Over the past decades, superconducting qubits have emerged as one of leading hardware platforms for realizing a quantum processor. Consequently, researchers made significant effort to understand loss channels that limit coherence times qubits. A major source has been attributed two level systems are present at material interfaces. It is recently shown replacing metal in capacitor transmon with tantalum yields record relaxation and qubits, motivating detailed study surface. In this work,...
Superconducting qubits are a leading system for realizing large-scale quantum processors, but overall gate fidelities suffer from coherence times limited by microwave dielectric loss. Recently discovered tantalum-based exhibit record lifetimes exceeding 0.3 ms. Here, we perform systematic, detailed measurements of superconducting tantalum resonators in order to disentangle sources loss that limit state-of-the-art devices. By studying the dependence on temperature, photon number, and device...