A5057523732- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Semiconductor materials and devices
- Quantum Computing Algorithms and Architecture
- Metal and Thin Film Mechanics
- Advanced Surface Polishing Techniques
- Quantum Information and Cryptography
- Carbon Nanotubes in Composites
- Advancements in Semiconductor Devices and Circuit Design
- Radioactive element chemistry and processing
- Ion-surface interactions and analysis
- Optical Polarization and Ellipsometry
- Optical Wireless Communication Technologies
- Advanced Fluorescence Microscopy Techniques
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Laser-Matter Interactions and Applications
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Electron and X-Ray Spectroscopy Techniques
Princeton University
2019-2024
University of California, Santa Barbara
2021
University of Wisconsin–Madison
2021
University of Chicago
2021
Naval Air Warfare Center Training Systems Division
2017
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...
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.
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...
Neutral silicon vacancy centers (SiV0) in diamond are promising candidates for quantum networks because of their long spin coherence times and stable, narrow optical transitions. However, stabilizing SiV0 requires high purity, boron doped diamond, which is not a readily available material. Here, we demonstrate an alternative approach via chemical control the surface. We use low-damage processing annealing hydrogen environment to realize reversible highly stable charge state tuning undoped...
Nitrogen-vacancy (NV) centers in diamond are a promising platform for nanoscale NMR sensing. Despite significant progress toward using NV to detect and localize nuclear spins down the single spin level, NV-based spectroscopy of individual, intact, arbitrary target molecules remains elusive. Such sensing requires that immobilized within nanometers with long coherence. The inert nature typically harsh functionalization techniques such as thermal annealing or plasma processing, limiting scope...
Nitrogen-vacancy (NV) centers in diamond can be used for nanoscale sensing with atomic resolution and sensitivity; however, it has been observed that their properties degrade as they approach the surface. Here we report addition to degraded spin coherence, NV within nanometers of surface also exhibit decreased fluorescence contrast optically detected electron resonance (OD-ESR). We demonstrate this OD-ESR arises from charge state dynamics center, is strongly surface-dependent, indicating...
We present an investigation of the optical property orbital angular momentum (OAM) for use in detection objects obscured by a turbid underwater channel. In our experiment, target is illuminated Gaussian beam. An vortex formed passing object-reflected and backscattered light through diffractive spiral phase plate at receiver, which allows spatial separation coherent non-coherent light. This provides method discriminating from environment. Initial laboratory results show that ballistic return...
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...
Abstract Chemical functionalization of diamond surfaces by hydrogen is an important method for controlling the charge state near‐surface fluorescent color centers, essential process in fabricating devices such as field‐effect transistors and chemical sensors, a required first step realizing families more complex terminations through subsequent processing. In all these cases, termination typically achieved using plasma sources that can etch or damage diamond, well deposited materials embedded...
Chemical functionalization of diamond surfaces by hydrogen is an important method for controlling the charge state near-surface fluorescent color centers, essential process in fabricating devices such as field-effect transistors and chemical sensors, a required first step realizing families more complex terminations through subsequent processing. In all these cases, termination typically achieved using plasma sources which can etch or damage well deposited materials embedded colour centers....
Neutral silicon vacancy centers (SiV0) in diamond are promising candidates for quantum networks because of their long spin coherence times and stable, narrow optical transitions. However, stabilizing SiV0 requires high purity, boron doped diamond, which is not a readily available material. Here, we demonstrate an alternative approach via chemical control the surface. We use low-damage processing annealing hydrogen environment to realize reversible highly stable charge state tuning undoped...
We identify candidate loss channels in tantalum by correlating X-ray photoelectron spectroscopy measurements with power and temperature dependent variation of the quality factor superconducting coplanar waveguide microwave resonators.
Emerging quantum technologies require precise control over systems of increasing complexity. Defects in diamond, particularly the negatively charged nitrogen-vacancy (NV) center, are a promising platform with potential to enable ranging from ultra-sensitive nanoscale sensors, repeaters for long distance networks, simulators complex dynamical processes many-body systems, scalable computers. While these advances due large part distinct material properties uniqueness this also presents...
Understanding the dynamics of a quantum bit's environment is essential for realization practical systems information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study disordered spin ensemble at surface. Specifically, we tune density "dark" surface spins interrogate their contribution decoherence shallow NV center qubits. When average spacing exceeds depth, find that free induction decay can be described by stretched exponential with variable power n....
Nitrogen-vacancy centers in diamond are a promising platform for nanoscale nuclear magnetic resonance sensing. Despite significant progress towards using NV to detect and localize spins down the single spin level, NV-based spectroscopy of individual, intact, arbitrary target molecules remains elusive. molecular sensing requires that immobilized within few nanometers with long coherence time. The inert nature typically harsh functionalization techniques such as thermal annealing or plasma...
We have constructed a unique cluster tool for surface preparation and spectroscopy in ultrahigh vacuum combined with cryogenic, confocal microscopy of single nitrogen vacancy centers diamond. modify the diamond chemistry investigate shallow center properties situ.