A5031753236- Diamond and Carbon-based Materials Research
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Force Microscopy Techniques and Applications
- Optical Network Technologies
- Carbon Nanotubes in Composites
- Quantum Computing Algorithms and Architecture
- Photonic Crystals and Applications
- Nonlinear Optical Materials Studies
- Electronic and Structural Properties of Oxides
- Nanopore and Nanochannel Transport Studies
- Semiconductor Lasers and Optical Devices
- Neural Networks and Reservoir Computing
- Advanced Materials Characterization Techniques
- High-pressure geophysics and materials
- Photorefractive and Nonlinear Optics
- Advanced biosensing and bioanalysis techniques
- Acoustic Wave Resonator Technologies
- Laser-Matter Interactions and Applications
- Ion-surface interactions and analysis
- Thermal properties of materials
- Anodic Oxide Films and Nanostructures
Harvard University
2017-2025
Harvard University Press
2019-2022
University of Pennsylvania
2014
Integrated photonics is at the heart of many classical technologies, from optical communications to biosensors, LIDAR, and data center fiber interconnects. There strong evidence that these integrated technologies will play a key role in quantum systems as they grow few-qubit prototypes tens thousands qubits. The underlying laser with required functionality performance, can only be realized through integration components onto photonic circuits (QPICs) accompanying electronics. In last decade,...
Photon-mediated interactions between quantum systems are essential for realizing networks and scalable information processing. We demonstrate such pairs of silicon-vacancy (SiV) color centers strongly coupled to a diamond nanophotonic cavity. When the optical transitions two tuned into resonance, coupling common cavity mode results in coherent interaction them, leading spectrally-resolved superradiant subradiant states. use electronic spin degrees freedom SiV control these optically-mediated...
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...
Color centers in diamond provide a promising platform for quantum optics the solid state, with coherent optical transitions and long-lived electron nuclear spins. Building upon recent demonstrations of nanophotonic waveguides cavities single-crystal diamond, we now demonstrate on-chip nanophotonics high efficiency fiber-optical interface, achieving > 90% power coupling at visible wavelengths. We use this approach to bright source narrowband single photons, based on silicon-vacancy color...
DNA sequencing using solid-state nanopores is, in part, impeded by the relatively high noise and low bandwidth of current state-of-the-art translocation measurements. In this Letter, we measure ion through sub 10 nm thick Si3N4 at bandwidths up to 1 MHz. At these bandwidths, input-referred is dominated amplifier's voltage acting across total capacitance amplifier input. By reducing nanopore chip 1-5 pF range adding insulating layers surface, are able transition a regime which (∼ 117-150...
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...
Phonons are envisioned as coherent intermediaries between different types of quantum systems. Engineered nanoscale devices, such optomechanical crystals (OMCs), provide a platform to utilize phonons information carriers. Here we demonstrate OMCs in diamond designed for strong interactions and silicon vacancy (SiV) spin. Using optical measurements at millikelvin temperatures, measure line width 13 kHz (Q-factor ∼4.4 × 105) 6 GHz acoustic mode, record the frequency range within an order...
Photon-mediated coupling between distant matter qubits may enable secure communication over long distances, the implementation of distributed quantum computing schemes, and exploration new regimes many-body dynamics. Solid-state emitters coupled to nanophotonic devices represent a promising approach towards these goals, as they combine strong light-matter interaction high photon collection efficiencies. However, nanostructured environments introduce mismatch diffusion in optical transition...
Efficient generation, guiding, and detection of phonons, or mechanical vibrations, are interest in various fields, including radio-frequency communication, sensing, quantum information. Diamond is a useful platform for phononics because the presence strain-sensitive spin qubits, its high Young's modulus, which allows low-loss gigahertz devices. We demonstrate diamond phononic waveguide generating, detecting gigahertz-frequency surface acoustic wave (SAW) phonons. generate SAWs using...
Diamond offers good optical properties and hosts bright color centers with long spin coherence times. Recent advances in angled-etching of diamond, specifically reactive ion beam angled etching (RIBAE), have led to successful demonstration quantum photonic devices operating at visible wavelengths. However, larger telecommunication wavelengths been difficult fabricate due the increased mask erosion, arising from size requiring longer etch We evaluated different materials for RIBAE diamond...
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...
Blind quantum computing is a promising application of distributed systems, in which client can perform computations on remote server without revealing any details the applied circuit. Although most realizations computers are based various matter-qubit platforms, implementing blind matter qubits remains challenge. Using silicon-vacancy (SiV) centers nanophotonic diamond cavities with an efficient optical interface, we demonstrated universal gate set consisting single- and two-qubit gates over...
They say no two are alike\dots{} Inversion-symmetric fluorescent color centers in diamonds, such as the germanium vacancy, desirable for solid-state single-photon emitters integrated quantum systems, but their complex mesoscopic environments make it challenging to obtain multiple $i\phantom{\rule{0}{0ex}}d\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l$ emitters. These...
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...
Color centers have emerged as a leading qubit candidate for realizing hybrid spin-photon quantum information technology. One major limitation of the platform, however, is that characteristics individual color are often strain dependent. As an illustrative case, silicon-vacancy center in diamond typically requires millikelvin temperatures order to achieve long coherence properties, but strained been shown operate at beyond 1 K without phonon-mediated decoherence. In this work, we combine...
Practical quantum networks will require multi-qubit nodes. This in turn increase the complexity of photonic circuits needed to control each qubit and strategies multiplex memories. Integrated photonics operating at visible near-infrared (VNIR) wavelength range can provide solutions these needs. In this work, we realize a VNIR thin-film lithium niobate (TFLN) integrated platform with key components meet requirements, including low-loss couplers (<1 dB/facet), switches (>20 dB extinction),...
We present a nano-electromechanical platform for controlling optical transitions from spatially separated color centers in diamond waveguides. use this technology to greatly suppress spectral diffusion and demonstrate strain induced quantum interference between separate emitters.