A5049739585- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Electronic and Structural Properties of Oxides
- Quantum Information and Cryptography
- Semiconductor materials and devices
- Graphene research and applications
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Topological Materials and Phenomena
- Advanced Fiber Laser Technologies
- Molecular Junctions and Nanostructures
- Nonlinear Optical Materials Studies
- Metal and Thin Film Mechanics
- Quantum Mechanics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Crystallization and Solubility Studies
- Porphyrin and Phthalocyanine Chemistry
- Quantum Computing Algorithms and Architecture
- Magnetic Field Sensors Techniques
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Acoustic Wave Resonator Technologies
Pontificia Universidad Católica de Chile
2015-2024
Lawrence Livermore National Laboratory
2022
Institute for Solid State Physics and Optics
2022
HUN-REN Wigner Research Centre for Physics
2022
University of Wisconsin–Madison
2022
Budapest University of Technology and Economics
2022
Harvard University
2007-2011
Harvard University Press
2008
Instituto de Cibernética Matemática y Física
2007
University of Stuttgart
2007
The key challenge in experimental quantum information science is to identify isolated mechanical systems with long coherence times that can be manipulated and coupled together a scalable fashion. We describe the coherent manipulation of an individual electron spin nearby nuclear spins create controllable register. Using optical microwave radiation control associated nitrogen vacancy (NV) color center diamond, we demonstrated robust initialization bits (qubits) transfer arbitrary states...
We present a procedure that makes use of group theory to analyze and predict the main properties negatively charged nitrogen-vacancy (NV) center in diamond. focus on relatively low temperatures limit where both spin-spin spin-orbit effects are important consider. demonstrate may be used clarify several aspects NV structure, such as ordering singlets ($e^2$) electronic configuration, interactions ($ae$) configuration. also discuss how optical selection rules response electric field can for...
The negatively charged silicon vacancy (SiV) color center in diamond has recently proven its suitability for bright and stable single photon emission. However, electronic structure so far remained elusive. We here explore the by exposing SiV defects to a magnetic field where Zeeman effect lifts degeneracy of sublevels. similar response centers ensemble low strain reference sample proves our ability fabricate almost perfect SiVs, revealing true nature defect's properties. model states using...
We describe a technique that enables strong coherent coupling between single electronic spin qubit associated with nitrogen-vacancy impurity in diamond and the quantized motion of magnetized nanomechanical resonator tip. This is achieved via careful preparation dressed states which are highly sensitive to but insensitive perturbations from nuclear-spin bath. In combination optical pumping techniques, exchange motional excitations ground-state cooling controlled generation arbitrary quantum...
Robust measurement of single quantum bits plays a key role in the realization computation and communication as well metrology sensing. We have implemented method for improved readout electronic spin qubits solid-state systems. The makes use logic operations on system consisting several proximal nuclear ancillae order to repetitively state spin. Using coherent manipulation nitrogen vacancy center room-temperature diamond, full control an electronic-nuclear up three spins was achieved. took...
We present an experimental and theoretical study of electronic spin decoherence in ensembles nitrogen-vacancy (NV) color centers bulk high-purity diamond at room temperature. Under appropriate conditions, we find ensemble NV coherence times $({T}_{2})$ comparable to that single with ${T}_{2}>600\text{ }\ensuremath{\mu}\text{s}$ for a sample natural abundance $^{13}\text{C}$ paramagnetic impurity density $\ensuremath{\sim}{10}^{15}\text{ }{\text{cm}}^{\ensuremath{-}3}$. also observe sharp...
Optically interfaced spins in the solid promise scalable quantum networks. Robust and reliable optical properties have so far been restricted to systems with inversion symmetry. Here, we release this stringent constraint by demonstrating outstanding spin of single silicon vacancy centres carbide. Despite lack symmetry, system's particular wave function symmetry decouples its from magnetic electric fields, as well local strain. This provides a high-fidelity spin-to-photon interface...
Among a variety of layered materials used as building blocks in van der Waals heterostructures, hexagonal boron nitride (hBN) appears an ideal platform for hosting optically-active defects owing to its large bandgap ($\sim 6$ eV). Here we study the optical response high-purity hBN crystal under green laser illumination. By means photon correlation measurements, identify individual emitting highly photostable fluorescence ambient conditions. A detailed analysis photophysical properties...
We present a detailed theoretical analysis of the electron spin decoherence in single nitrogen-vacancy defects ultrapure diamond. The is due to interactions with $^{13}\text{C}$ nuclear spins diamond lattice. Our approach takes advantage low concentration (1.1%) and their random distribution lattice by an algorithmic aggregation into small, strongly interacting groups. By making use this disjoint cluster approach, we demonstrate possibility nontrival dynamics that cannot be described time...
The split silicon-vacancy defect (SiV) in diamond is an electrically and optically active color center. Recently, it has been shown that this center bright can be detected at the single level. In addition, SiV shows a non-zero electronic spin ground state potentially makes alternative candidate for quantum optics metrology applications beside well-known nitrogen-vacancy diamond. However, structure of defect, nature optical excitations other related properties are not well-understood. Here we...
Nitrogen-vacancy centers in diamond (NV) attract great attention because they serve as a tool many important applications. The NV center has polarizable spin $S=1$ ground state and its can be addressed by optically detected magnetic resonance (ODMR) techniques. ${m}_{S}=0$ ${m}_{S}=\ifmmode\pm\else\textpm\fi{}1$ levels of the are separated about 2.88 GHz absence an external field or any other perturbations. This zero-field splitting (ZFS) probed ODMR. As this changes function pressure...
Quantum entanglement is among the most fascinating aspects of quantum theory. Here we realize between polarization a single optical photon and solid-state spin qubit associated with nitrogen vacancy centre in diamond.
A recent study associates carbon with single photon emitters (SPEs) in hexagonal boron nitride (h-BN). This observation, together the high mobility of h-BN, suggests existence SPEs based on clusters. Here, by means density functional theory calculations, we studied clusters substitutional atoms up to tetramers h-BN. Two different conformations neutral trimers have zero-point line energies and shifts phonon sideband compatible typical photoluminescence spectra. Moreover, some two small C next...
We analyze the impact of electric field and magnetic fluctuations in decoherence electronic spin associated with a single nitrogen-vacancy (NV) defect diamond. To this end, we tune amplitude order to engineer eigenstates protected either against noise or noise. The competition between these sources is analyzed quantitatively by changing their relative strength through modifications host diamond material. This study provides significant insights into NV spin, which valuable for quantum...
We study a quantum battery made out of N nonmutually interacting qubits coupled to dissipative single electromagnetic field mode in resonator. quantify the charging energy, ergotropy, transfer rate, and power system, showing that collective enhancements are still present despite losses, can even increase with dissipation. Moreover, we observe performance deterioration due dissipation be reduced by scaling up size. This is useful for experimental realizations when controlling quality...
Spin-lattice relaxation within the nitrogen-vacancy (NV) center's electronic ground-state spin triplet limits its coherence times, and thereby impacts performance in quantum applications. We report measurements of rates on NV |m_{s}=0⟩↔|m_{s}=±1⟩ |m_{s}=-1⟩↔|m_{s}=+1⟩ transitions as a function temperature from 9 to 474 K high-purity samples. show that dependencies are reproduced by an ab initio theory Raman scattering due second-order spin-phonon interactions, we discuss applicability other...
Abstract Topological insulators (TIs) are materials with unique surface conductive properties that distinguish them from normal and have attracted significant interest due to their potential applications in electronics spintronics. However, weak magnetic field response traditional setups has limited practical applications. Here, we show integrating TIs active metamaterial substrates can significantly enhance the induced by more than 10 4 times. Our results demonstrate selecting specific...
We report a systematic study of the hyperfine interaction between electron spin single nitrogen-vacancy (NV) defect in diamond and nearby ${}^{13}\text{C}$ nuclear spins, by using pulsed electron-spin resonance spectroscopy. isolate set discrete values coupling strength ranging from 14 MHz to 400 kHz corresponding spins placed at different lattice sites matrix. For each site, is further investigated through nuclear-spin polarization measurements studying magnetic field dependence splitting....
We describe a method to enhance the sensitivity of precision measurements that takes advantage quantum sensor's environment amplify its response weak external perturbations. An individual qubit is used sense dynamics surrounding ancillary qubits, which are in turn affected by field be measured. The resulting enhancement determined number ancillas coupled strongly sensor qubit; it does not depend on exact values coupling strengths and resilient many forms decoherence. achieves nearly...
We use the electronic spin of a single Nitrogen-Vacancy (NV) defect in diamond to observe real-time evolution neighboring nuclear spins under ambient conditions. Using sample with natural abundance $^{13}$C isotopes, we first demonstrate high fidelity initialization and single-shot readout an individual spin. By including intrinsic $^{14}$N NV quantum register, then report simultaneous observation jumps linked both species, providing efficient two qubits. These results open up new avenues...