A5007316750- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Magnetic Field Sensors Techniques
- Electronic and Structural Properties of Oxides
- Metal and Thin Film Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced MRI Techniques and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Magnetic properties of thin films
- Semiconductor materials and devices
- Advanced Frequency and Time Standards
- Quantum, superfluid, helium dynamics
- Magnetic Properties and Applications
- Covalent Organic Framework Applications
- Molecular Junctions and Nanostructures
- Integrated Circuits and Semiconductor Failure Analysis
- Machine Learning in Materials Science
- Crystallography and molecular interactions
- Neural Networks and Reservoir Computing
- Organic and Molecular Conductors Research
MIT Lincoln Laboratory
2021-2024
Massachusetts Institute of Technology
2016-2024
Harvard University
2016-2021
Center for Astrophysics Harvard & Smithsonian
2020
Oberlin College
2011
Solid-state spin systems including nitrogen-vacancy (NV) centers in diamond constitute an increasingly favored quantum sensing platform. However, present NV ensemble devices exhibit sensitivities orders of magnitude away from theoretical limits. The sensitivity shortfall both handicaps existing implementations and curtails the envisioned application space. This review analyzes proposed approaches to enhance broadband ensemble-NV-diamond magnetometers. Improvements dephasing time, readout...
Significance We demonstrate noninvasive detection of action potentials with single-neuron sensitivity, including in whole organisms. Our sensor is composed quantum defects within a diamond chip, which detect time-varying magnetic fields generated by potentials. The biocompatible and can be brought into close proximity to the organism without adverse effect, allowing for long-term observation superior resolution neuron fields. Optical also provides information about potential propagation that...
We present a combined theoretical and experimental study of solid-state spin decoherence in an electronic bath, focusing specifically on ensembles nitrogen vacancy (NV) color centers diamond the associated substitutional bath. perform measurements NV free induction decay times $T_2^*$ spin-echo coherence $T_2$ 25 samples with concentrations [N] ranging from 0.01 to 300\,ppm. introduce microscopic model numerical simulations quantitatively explain degradation both over four orders magnitude...
Quantum spin dephasing is caused by inhomogeneous coupling to the environment, with resulting limits measurement time and precision of spin-based sensors. The effects can be especially pernicious for dense ensembles electronic spins in solid-state, such as nitrogen-vacancy (NV) color centers diamond. We report use two complementary techniques, bath control double quantum coherence, enhance ($T_2^*$) NV more than an order magnitude. In combination, these techniques (i) eliminate dominant...
Real-time sensing of dynamic vector magnetic fields is used in areas ranging from navigation to biocurrent imaging. Many magnetometers measure only a single field component at time, and may suffer orientation errors. Employing frequency-multiplexing technique with an ensemble nitrogen-vacancy centers diamond, the authors present device that measures $a\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}l$ components once, operating high bandwidth top-notch sensitivity. With low implementation...
Abstract Ensembles of nitrogen-vacancy (NV) centres in diamond are a leading platform for practical quantum sensors. Reproducible and scalable fabrication NV-ensembles with desired properties is crucial, as an understanding how those influence performance. This work addresses these issues by characterising nitrogen-doped produced the chemical vapour deposition (CVD) method across range synthesis conditions. shown to produce material widely differing absorption characteristics, which linked...
Quantum sensors such as spin defects in diamond have achieved excellent performance by combining high sensitivity with spatial resolution. Unfortunately, these can only detect signal fields frequency a few accessible ranges, typically low frequencies up to the experimentally achievable control field amplitudes and narrow window around sensors' resonance frequency. Here, we develop demonstrate technique for sensing arbitrary-frequency signals using sensor qubit quantum mixer, enabling variety...
Diffuse reflectance infrared (IR) spectroscopy performed over a wide temperature range (35-298 K) is used to study the dynamics of H(2) adsorbed within isostructural metal-organic frameworks M(2)L (M = Mg, Mn, Co, Ni and Zn; L 2,5-dioxidobenzene-1,4-dicarboxylate) referred as MOF-74 CPO-27. Spectra collected at concentrations ranging from 0.1 3.0 per metal cation reveal that strongly red-shifted vibrational modes arise isolated bound available coordination site. The red shift bands...
We present a micrometer-resolution millimeter-field-of-view stress imaging method for diamonds containing thin surface layer of nitrogen vacancy (NV) centers. In this method, we reconstruct tensor elements over two-dimensional field view from NV optically-detected magnetic resonance (ODMR) spectra. use technique to study how inhomogeneity affects magnetometry performance, and show is useful direct way assess these effects. This new tool mapping in diamond will aid optimization NV-diamond...
Abstract Overcoming poor readout is an increasingly urgent challenge for devices based on solid-state spin defects, particularly given their rapid adoption in quantum sensing, information, and tests of fundamental physics. However, spite experimental progress specific systems, sensors still lack a universal, high-fidelity technique. Here we demonstrate high-fidelity, room-temperature ensemble nitrogen-vacancy centers via strong coupling to dielectric microwave cavity, building similar...
Magnetometry with diamond nitrogen-vacancy (NV) ensembles has enabled devices picotesla sensitivity at static and low-frequency fields, but their performance higher frequencies lags far behind. The authors solve the technical challenges demonstrate a microwave-frequency NV magnetometer sensitivity, by implementing pulse scheme for noise cancellation employing custom-grown diamond. This enhancement could be extended into broader range of using spin-locking quantum frequency mixing. These...
Microporous metal−organic frameworks possessing exposed metal cation sites on the pore surface are of particular interest for high-density H2 storage at ambient temperatures, owing to potential binding appropriate isosteric heat adsorption reversible room temperature (ca. −20 kJ/mol). The structure Cr3(BTC)2 (BTC3− = 1,3,5-benzenetricarboxylate) consists dinuclear paddlewheel secondary building units connected by triangular BTC3− bridging ligands form a three-dimensional, cubic framework....
Nitrogen-vacancy centers in diamond are promising as sensitive vector magnetometers, quantum repeaters, and qubits, but realizing this potential has been limited by the material itself. Here a comprehensive study addresses creation of nitrogen-vacancy centers, balancing impact irradiation annealing on coherence properties commercial material. Photoluminescence decomposition analysis is used to quantitatively determine neutral-to-negative charge-state ratio, for insight into electron properties.
Abstract Parameterizations of unresolved turbulent processes often compromise the fidelity large‐scale ocean models. In this work, we argue for a Bayesian approach to refinement and evaluation turbulence parameterizations. Using an ensemble large eddy simulations penetrative convection in surface boundary layer, demonstrate method by estimating uncertainty parameters convective limit popular “K‐Profile Parameterization.” We uncover structural deficiencies propose alternative scaling that...
We introduce a microwave-assisted spectroscopy technique to determine the relative ratio of fluorescence emitted by nitrogen-vacancy (N-$V$) centers in diamond that are negatively charged ($\mathrm{N}\text{\ensuremath{-}}{V}^{\ensuremath{-}}$) and neutrally ($\mathrm{N}\text{\ensuremath{-}}{V}^{0}$) present its application studying spin-dependent ionization N-$V$ ensembles enhancing N-$V$-magnetometer sensitivity. Our is based on selectively modulating...
Diffuse reflectance infrared (IR) spectroscopy was used to study the structure and dynamics of H2 CO2 adsorbed within isostructural metal–organic frameworks M2L (M = Mg, Mn, Fe, Co, Zn; L 2,5-dioxidobenzene-1,4-dicarboxylate) referred as M-MOF-74 CPO-27-M. Cluster models primary adsorption site were excised from periodic that optimized using plane-wave density functional theory at Perdew–Burke–Ernzerhof (PBE) level. Models incorporating an or dispersion-corrected (DFT), anharmonic...
Wide-field imaging of magnetic signals using ensembles nitrogen-vacancy (NV) centers in diamond has garnered increasing interest due to its combination micron-scale resolution, millimeter-scale field view, and compatibility with diverse samples from across the physical life sciences. Recently, wide-field NV based on Ramsey protocol achieved uniform enhanced sensitivity compared conventional measurements. Here, we integrate Ramsey-based spin-bath driving extend spin dephasing time improve...
We introduce a double quantum (DQ) 4-Ramsey measurement protocol that enables wide-field magnetic imaging using nitrogen vacancy (NV) centers in diamond, with enhanced homogeneity of the sensitivity relative to conventional single (SQ) techniques. The DQ employs microwave-phase alternation across four consecutive Ramsey (4-Ramsey) measurements isolate desired signal from any residual SQ induced by microwave pulse errors. In demonstration experiment employing 1-$μ$m-thick NV layer macroscopic...
Nitrogen-vacancy (NV) spin ensembles in diamond provide an advanced magnetic sensing platform, with applications both the physical and life sciences. The development of isotopically engineered $^{15}\mathrm{NV}$ offers advantages over naturally occurring $^{14}\mathrm{NV}$ for magnetometry, due to its simpler hyperfine structure. However, modalities requiring a bias field not aligned NV axis, absence quadrupole moment $^{15}\mathrm{N}$ nuclear leads pronounced envelope modulation effects...
Ensembles of nitrogen-vacancy (NV) centers in diamond are a leading platform for practical quantum sensors. Reproducible and scalable fabrication NV-ensembles with desired properties is crucial. This work addresses these challenges by developing chemical vapor deposition (CVD) synthesis process to produce material at scale improved NV-ensemble target NV density. The reported this enables immediate sensitivity improvements current devices. In addition, techniques established sensor...
Wide-field magnetic microscopy using nitrogen-vacancy (NV) centers in diamond can yield high-quality images of DC and AC fields. The unique combination micron-scale spatial resolution scalar or vector fields at room temperature parallel camera readout make this an appealing technique for applications biology, geology, condensed-matter physics, electronics. However, while NV has achieved great success these areas, historically the accessible frequency range been limited. In paper, we overcome...
Abstract Wide-field magnetic imagers using nitrogen-vacancy (NV) centers in diamond yield high-resolution images for various applications, including field imaging (MFI) of electronics. Despite the ongoing successes this emerging technique passively interrogating electronics components (including failure analysis troubleshooting), most focus has been on sensing DC and low-frequency currents, due to technical challenges associated with measuring higher-frequency fields. Here, we overcome these...