A5026599520- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Force Microscopy Techniques and Applications
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Spectroscopy and Quantum Chemical Studies
- Quantum Mechanics and Applications
- Quantum, superfluid, helium dynamics
- Strong Light-Matter Interactions
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Magnetic Field Sensors Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Advanced Materials Characterization Techniques
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Spectroscopy and Laser Applications
- Advanced Surface Polishing Techniques
Hebrew University of Jerusalem
2015-2024
Hebrew College
2022
Canadian Institute for Advanced Research
2018
Center for Astrophysics Harvard & Smithsonian
2012-2015
Harvard University
2011-2013
Weizmann Institute of Science
2006-2011
Harvard University Press
2011
Technion – Israel Institute of Technology
2002-2004
We report on the noise spectrum experienced by few nanometer deep nitrogen-vacancy centers in diamond as a function of depth, surface coating, magnetic field and temperature. Analysis reveals double-Lorentzian spectra consistent with electronic spin bath, slower dynamics due to spin-spin interactions faster related phononic coupling. These results shed new light mechanisms responsible for affecting shallow spins at semiconductor interfaces, suggests possible directions further studies....
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...
A common limitation of experiments using color centers in diamond is the poor photon collection efficiency microscope objectives due to refraction at interface. We present a simple and effective technique detect large fraction photons emitted by within planar sample detecting light that guided edges via total internal reflection. describe prototype device this "side-collection" technique, which provides approximately 47% detection 39%. apply enhanced signal-to-noise ratio gained from...
We use multi-pulse dynamical decoupling to increase the coherence lifetime (T2) of large numbers nitrogen-vacancy (NV) electronic spins in room temperature diamond, thus enabling scalable applications multi-spin quantum information processing and metrology. realize an order-of-magnitude extension NV T2 for diamond samples with widely differing spin environments. For nitrogen impurity concentration <~1 ppm, we find > 2 ms, comparable longest time reported single centers, demonstrate a...
We demonstrate significant improvements of the spin coherence time a dense ensemble nitrogen-vacancy (NV) centers in diamond through optimized dynamical decoupling (DD). Cooling sample down to $77$ K suppresses longitudinal relaxation $T_1$ effects and DD microwave pulses are used increase transverse $T_2$ from $\sim 0.7$ ms up 30$ ms. extend previous work single-axis (CPMG) towards preservation arbitrary states. Following theoretical experimental characterization pulse detuning errors, we...
We demonstrate preferential orientation of nitrogen-vacancy (NV) color centers along two four possible crystallographic axes in diamonds grown by chemical vapor deposition on the ${100}$ face. identify relevant growth regime and present a explanation this effect. show that provides increased optical readout contrast for NV multispin measurements, including enhanced ac magnetic-field sensitivity, thus providing an important step towards high-fidelity multispin-qubit quantum information...
Under ambient conditions, spin impurities in solid-state systems are found thermally mixed states and optically ``dark''; i.e., the cannot be controlled. Nitrogen-vacancy (NV) centers diamond an exception that electronic ``bright''; they can polarized by optical pumping, coherently manipulated with spin-resonance techniques, read out optically, all at room temperature. Here we demonstrate a scheme to resonantly couple bright NV spins dark substitutional-nitrogen ($P1$) dressing their...
When an electron passes through a chiral molecule there is high probability for correlation between the momentum and spin of charge, thus leading to polarized current. This phenomenon known as induced selectivity (CISS) effect. One most surprising experimental results recently demonstrated that magnetization reversal in ferromagnet (FM) with perpendicular anisotropy can be realized solely by chemisorbing molecular monolayer without applying any current or external magnetic field. result...
The studies of many-body dynamics interacting spin ensembles, as well quantum sensing in solid state systems, are often limited by the need for high concentrations, along with efficient decoupling ensemble interest from its spin-bath environment. In particular, an nitrogen-vacancy (NV) centers diamond, conversion efficiencies between nitrogen (P1) defects and NV essential, while maintaining long coherence times ensemble. this work, we study effect electron irradiation on efficiency time...
Nitrogen vacancy (NV) centers in diamond have been identified over the past few years as promising systems for a variety of applications, ranging from quantum information science to magnetic sensing. This relies on unique optical and spin properties negatively charged NV. Many these applications require shallow NV centers, i.e., NVs that are close (a nm) surface. In recent there has increasing interest understanding charge dynamics under various illumination conditions, specifically infrared...
The coherence times achieved with continuous dynamical decoupling techniques are often limited by fluctuations in the driving amplitude. In this work, we use time-dependent phase-modulated to increase robustness against such a dense ensemble of nitrogen-vacancy centers diamond. Considering realistic experimental errors system, identify optimal modulation strength and demonstrate an improvement order magnitude spin preservation arbitrary states over conventional single driving. exhibits...
Nitrogen-vacancy (NV) color centers in diamond have emerged as promising quantum solid-state systems, with applications ranging from information processing to magnetic sensing. One of the most useful properties NVs is ability read their ground-state spin projection optically at room temperature. Using theoretical analysis Purcell-enhanced NV optical coupling, we identify parameters for a significantly enhanced single-to-noise ratio (SNR) spin-state readout. We then demonstrate that combined...
Electron Spin Resonance (ESR) is a widely common method in the field of quantum sensing. Specifically with Nitrogen-Vacancy (NV) center diamond, used for sensing magnetic and electric fields, strain temperature. However, ESR measurements are limited temporal resolution, primarily due to large number data points required especially high dynamic range regimes need extensive averaging caused by low signal-to-noise ratio (SNR). This study introduces novel application compressed (CS) using NV...
We demonstrate that collective continuous variables of two species trapped ultracold bosonic gases can be Einstein-Podolsky-Rosen-correlated (entangled) via inherent interactions between the species. propose different schemes for creating these correlations---a dynamical scheme and a static analogous to two-mode squeezing in quantum optics. quantify correlations by using known measures entanglement study effect finite temperature on correlations.
We show, using an exactly solvable model, that nonlinear dynamics is induced in a double-well Bose-Einstein condensate (BEC) by collisions with thermal reservoir. This can facilitate the creation of phase or number squeezing and, at longer times, macroscopic nonclassical superposition states. Enhancement these effects possible loading reservoir atoms into optical lattice.
We show that microwave-driven NV centers can function as topological mode switches by utilizing a special degeneracy called an exceptional point (EP). By tuning the intensities and frequencies of driving fields, we find EP---where two normal modes system coalesce---and, then, use it to simulate dynamics demonstrate non-reciprocal switching. comparing density matrices input output states, quantum correlations decrease three orders magnitude at room temperature, discuss ways for improving this...
Understanding the dynamics of dissipative quantum systems, particularly beyond weak coupling approximation, is central to various applications. While numerically exact methods provide accurate solutions, they often lack analytical insight provided by theoretical approaches. In this study, we employ recently-developed method dubbed effective Hamiltonian theory understand system-bath configurations without resorting a perturbative description energy. Through combination mapping steps and...
We demonstrate through an exactly solvable model that collective coupling to any thermal bath induces effectively nonlinear couplings in a quantum many-body (multi-spin) system. The resulting evolution can drive uncorrelated large-spin system with high probability into macroscopic quantum-superposition state. discuss possible experimental realizations.
Abstract The occurrence of any physical process is restricted by the constraints imposed laws thermodynamics on energy and entropy exchange involved. A prominent class processes where thermodynamic are crucial involve polarization nuclear spin baths that at heart magnetic resonance imaging, (NMR), quantum information processing. Polarizing a bath, key to enhancing sensitivity these tools, leading new analytical capabilities improved medical diagnostics. In recent years, significant effort...