A5069170982- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Diamond and Carbon-based Materials Research
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum Computing Algorithms and Architecture
- Photonic Crystals and Applications
- Thermal Radiation and Cooling Technologies
- Force Microscopy Techniques and Applications
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Magnetic and transport properties of perovskites and related materials
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Advanced Materials Characterization Techniques
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Ionosphere and magnetosphere dynamics
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum-Dot Cellular Automata
Harvard University
2019-2024
Harvard University Press
2019-2021
Center for Integrated Nanotechnologies
2019
Los Alamos National Laboratory
2019
University of California, Los Angeles
2016-2018
Quantum networks require functional nodes consisting of stationary registers with the capability high-fidelity quantum processing and storage, which efficiently interface photons propagating in an optical fiber. We report a significant step towards realization such using diamond nanocavity embedded silicon-vacancy (SiV) color center proximal nuclear spin. Specifically, we show that efficient SiV-cavity coupling (with cooperativity C>30) provides nearly deterministic between electron spin...
We realize an elementary quantum network node consisting of a silicon-vacancy (SiV) color center inside diamond nanocavity coupled to nearby nuclear spin with 100 ms long coherence times. Specifically, we describe experimental techniques and discuss effects strain, magnetic field, microwave driving, bath on the properties this 2-qubit register. then employ these generate Bell-states between SiV incident photon as well spin. also control parameter regimes for utilizing SiV-nanocavity system...
Long-distance quantum communication and networking require memory nodes with efficient optical interfaces long times. We report the realization of an integrated two-qubit network node based on silicon-vacancy centers (SiVs) in diamond nanophotonic cavities. Our qubit register consists SiV electron spin acting as a strongly coupled 29Si nuclear time exceeding two seconds. By using highly strained suppressed spin-phonon interactions, we realize electron-photon entangling gates at elevated...
Abstract A key challenge in realizing practical quantum networks for long-distance communication involves robust entanglement between memory nodes connected by fibre optical infrastructure 1–3 . Here we demonstrate a two-node network composed of multi-qubit registers based on silicon-vacancy (SiV) centres nanophotonic diamond cavities integrated with telecommunication network. Remote is generated the cavity-enhanced interactions electron spin qubits SiVs and photons. Serial, heralded...
Practical quantum networks require interfacing memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional frequency conversion enables a solid-state memory to directly interface telecom-band systems. In particular, of visible-band single photons emitted from silicon-vacancy (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mi>Si</a:mi></a:math><d:math...
Distributing quantum information between remote systems will necessitate the integration of emerging components with existing communication infrastructure. This requires understanding channel-induced degradations transmitted signals, beyond typical characterization methods for classical systems. Here we report on a comprehensive Boston-Area Quantum Network (BARQNET) telecom fiber testbed, measuring time-of-flight, polarization, and phase noise imparted signals. We further design demonstrate...
An efficient, scalable source of shaped single photons that can be directly integrated with optical fiber networks and quantum memories is at the heart many protocols in information science. We demonstrate a deterministic arbitrarily temporally single-photon pulses high efficiency [detection efficiency=14.9%] purity [g^{(2)}(0)=0.0168] streams up to 11 consecutively detected using silicon-vacancy center highly directional fiber-integrated diamond nanophotonic cavity. Combined previously...
Spontaneous emission, stimulated emission and absorption are the three fundamental radiative processes describing light–matter interactions. Here, we theoretically study behavior of these inside an unbounded medium exhibiting a vanishingly small refractive index, i.e., near-zero-index (NZI) host medium. We present generalized framework to find that spatial dimension NZI has profound effects on nature processes. Our formalism highlights role number available optical modes as well ability...
The utility of all parametric nonlinear optical processes is hampered by phase-matching requirements. Quasi-phase-matching, birefringent phase matching, and higher-order-mode matching have been developed to address this constraint, but the methods demonstrated date suffer from inconvenience only being matched for a single, specific arrangement beams, typically copropagating, resulting in cumbersome experimental configurations large footprints integrated devices. Here, we experimentally...
Abstract Room‐temperature magnetoelectric (ME) coupling is developed in artificial multilayers and nanocomposites composed of magnetostrictive electrostrictive materials. While the mechanisms strengths are widely studied, they largely unexplored vertically aligned (VANs), even though theory has predicted that VANs exhibit much larger ME coefficients than multilayer structures. Here, strong transverse longitudinal epitaxial BaTiO 3 :CoFe 2 O 4 measured by both optical second harmonic...
Solid-state quantum emitters are promising candidates for the realization of networks, owing to their long-lived spin memories, high-fidelity local operations, and optical connectivity long-range entanglement. However, due differences in environment, solid-state typically feature a range distinct transition frequencies, which makes it challenging create optically mediated entanglement between arbitrary emitter pairs. We propose demonstrate an efficient method entangling with transitions...
A key challenge in realizing practical quantum networks for long-distance communication involves robust entanglement between memory nodes connected via fiber optical infrastructure. Here, we demonstrate a two-node network composed of multi-qubit registers based on silicon-vacancy (SiV) centers nanophotonic diamond cavities integrated with telecommunication (telecom) network. Remote is generated the cavity-enhanced interactions SiV's electron spin qubits and photons. Serial, heralded...
Abstract Ultra-small mode volume nanophotonic crystal cavities have been proposed as powerful tools for increasing coupling rates in cavity quantum electrodynamics systems. However, their adoption information applications remains elusive. In this work, we investigate possible reasons why, and analyze the impact of different low resonator design choices on utility optics experiments. We band structure features loss bowtie diamond demonstrate independent control over cavity-emitter strength...
We present a new experimental platform for studying laboratory astrophysics that combines high-intensity, high-repetition-rate laser with the Large Plasma Device at University of California, Los Angeles. To demonstrate utility this platform, we show first results volumetric, highly repeatable magnetic field and electrostatic potential measurements, along derived quantities electric field, charge density current density, interaction between super-Alfvénic laser-produced plasma an ambient,...
Ultra-small mode volume nanophotonic crystal cavities have been proposed as powerful tools for increasing coupling rates in cavity quantum electrodynamics systems. However, their adoption information applications remains elusive. In this work, we investigate possible reasons why, and analyze the impact of different low resonator design choices on utility optics experiments. We band structure features loss bowtie diamond demonstrate independent control over cavity-emitter strength rates....
We generate remote entanglement between spatially separate color-center based quantum nodes at rates up to 1 Hz. In addition, we demonstrate across a deployed 35km long fiber loop in the Boston urban area.
We show progress towards the experimental demonstration of distributed blind quantum computing using a two node network Silicon-Vacancy (SiV) centres in diamond nanocavities.
A key challenge in realizing long-distance quantum networks involves entanglement between memory nodes via existing fiber infrastructure. Here, we demonstrate a two-node network based on Silicon Vacancy defect centers diamond nanophotonic cavities integrated with metropolitan telecommunication [1].
We generate remote entanglement between spatially separate color-center based nanophotonic quantum network nodes. In addition, we demonstrate distribution across a 35 km long fiber loop deployed in the Boston urban area.
Thermodynamic principles governing energy and information are important tools for a deeper understanding better control of quantum systems. In this work, we experimentally investigate the interplay thermodynamic costs flow in system undergoing iterative measurement feedback. Our study employs state stabilization protocol involving repeated feedback on an electronic spin qubit associated with Silicon-Vacancy center diamond, which is strongly coupled to diamond nanocavity. This setup allows us...
Blind quantum computing (BQC) is a promising application of distributed systems, where client can perform computations on remote server without revealing any details the applied circuit. While most realizations computers are based various matter qubit platforms, implementing BQC qubits remains an outstanding challenge. Using silicon-vacancy (SiV) centers in nanophotonic diamond cavities with efficient optical interface, we experimentally demonstrate universal gate set consisting single- and...
Practical quantum networks require interfacing memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional frequency conversion enables a solid-state memory to directly interface telecom-band systems. In particular, of visible-band single photons emitted from silicon-vacancy (SiV) center diamond O-band, maintaining low noise ($g^2(0)<0.1$) high indistinguishability ($V=89\pm8\%$). We further utility this system for networking by...
Spontaneous emission, stimulated emission and absorption are the three fundamental radiative processes describing light-matter interactions. Here, we theoretically study behaviour of these inside an unbounded medium exhibiting a vanishingly small refractive index, i.e., near-zero-index (NZI) host medium. We present generalized framework to find that spatial dimension NZI has profound effects on nature processes. Our formalism highlights role number available optical modes as well ability...