A5086034370- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Magnetic properties of thin films
- Neural Networks and Reservoir Computing
- Quantum Dots Synthesis And Properties
- Quantum Computing Algorithms and Architecture
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Diatoms and Algae Research
- Gyrotron and Vacuum Electronics Research
- Magneto-Optical Properties and Applications
- Electron Spin Resonance Studies
- Advanced NMR Techniques and Applications
- Molecular Junctions and Nanostructures
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Quantum many-body systems
- Electron and X-Ray Spectroscopy Techniques
- Near-Field Optical Microscopy
- Advancements in Semiconductor Devices and Circuit Design
The University of Tokyo
2017-2022
Université de Sherbrooke
2015-2020
Université Laval
2010-2014
Institut National d'Optique
2014
Abstract Engineered quantum systems enabling novel capabilities for computation and sensing have blossomed in the last decade. Architectures benefiting from combining complementary physical emerged as promising approaches technologies. A new class of hybrid based on collective spin excitations ferromagnetic materials has led to diverse set platforms outlined this review article. The coherent interaction between microwave cavity modes spin-wave is presented a key ingredient development more...
Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in GHz-to-THz frequency range, utilization nonlinear nonreciprocal phenomena, compatibility with CMOS are just a few many advantages offered by magnons. Although magnonics is still primarily positioned academic domain, scientific technological challenges field being extensively investigated, proof-of-concept prototypes have already been realized...
Quanta of collective spin excitations are observed in a ferromagnet by measurements superconducting quantum bit.
Hybrid quantum devices expand the tools and techniques available for sensing in various fields. Here, we experimentally demonstrate of a steady-state magnon population magnetostatic mode ferrimagnetic crystal. Dispersively coupling to superconducting qubit allows detection magnons using Ramsey interferometry with sensitivity on order 10−3 magnons/Hz. The protocol is based dissipation as dephasing via fluctuations reduces coherence proportionally number magnons.Received 19 May 2020Revised 22...
Detecting a single magnetic excitation Quantum-enhanced sensing is one of the near-term applications for developing field quantum technologies. A promising approach to relies on entangling well-controlled system (the sensor) interest detect quanta excitations in latter. By superconducting qubit with ferrimagnetic crystal, Lachance-Quirion et al. demonstrate that they can (a magnon) within sample. The demonstration high-efficiency single-magnon detector will be useful as well an active...
The Gottesman-Kitaev-Preskill (GKP) code encodes a logical qubit into bosonic system with resilience against single-photon loss, the predominant error in most systems. Here we present experimental results demonstrating quantum correction of GKP states based on reservoir engineering superconducting device. Error is made fully autonomous through an unconditional reset auxiliary transmon qubit. We show that lifetime increased from correction, therefore reaching point at which more errors are...
We demonstrate fast two-qubit gates using a parity-violated superconducting qubit consisting of capacitively-shunted asymmetric Josephson-junction loop under finite magnetic flux bias. The second-order nonlinearity manifesting in the enables interaction with neighboring single-junction transmon via first-order inter-qubit sideband transitions Rabi frequencies up to 30~MHz. Simultaneously, unwanted static longitudinal~(ZZ) is eliminated ac Stark shifts induced by continuous microwave drive...
Microwave-frequency superconducting resonators are ideally suited to perform dispersive qubit readout, mediate two-qubit gates, and shuttle states between distant quantum systems. A prerequisite for these applications is a strong qubit–resonator coupling. Strong coupling an electron-spin microwave resonator can be achieved by correlating spin- orbital degrees of freedom. This correlation through the Zeeman single electron in double dot spatially inhomogeneous magnetic field generated nearby...
We report an algorithm designed to perform computer-automated tuning of a single quantum dot with charge sensor. The performs adaptive measurement sequence sub-sized stability diagrams until the single-electron regime is identified and reached. For each measurement, signal processing module removes physical background sensor generate binary image transitions. Then, analysis identifies position number lines using two line detection schemes that are robust noise missing data.
Our investigations of silver selenide colloidal quantum dots, emitting in the biologically important near-infrared region, demonstrate size-dependence their optical properties. Ag2Se nanocrystals were prepared orthorhombic phase with average radius varying from 0.95 to 4.7 nm as observed by transmission electron microscopy. The high purity samples, established energy-dispersive X-ray spectroscopy and diffraction, allowed for accurate determination content suspensions a thermogravimetric...
Abstract The rapid development in designs and fabrication techniques of superconducting qubits has made coherence times longer. In the future, however, radiative decay a qubit into its control line will be fundamental limitation, imposing trade-off between fast long lifetime qubit. Here, we break this by strongly coupling another along line. This second qubit, which call “Josephson quantum filter” (JQF), prevents first from emitting microwave photons thus suppresses relaxation, while...
A series of samples CdSe/ CdxZn1 − xS core/shell quantum dots have been synthesized in order to measure the influence lattice-mismatch-induced strain on photoluminescence (PL) and blinking behaviour. The PL spectra show a significant variation fluorescence wavelength even though colloidal (cQDs) are similar size. excitation gradual splitting first exciton level as proportion Zn is increased shell grows. On other hand, studies clearly demonstrate dependence amount present shell. Distributions...
We report measurements of electrical transport through single CdSe/CdS core/shell colloidal quantum dots (cQDs) connected to source and drain contacts. observe telegraphic switching noise showing few plateaus at room temperature. model interpret these results as charge trapping individual trap states, therefore we resolve defects in high-quality low-strain cQDs. The small number observed quantitatively validates the passivation method based on thick CdS shells nearly lattice-matched CdSe...
Magnonics is a field of science that addresses the physical properties spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operations in GHz-to-THz frequency range, utilization nonlinear nonreciprocal phenomena, compatibility with CMOS are just few many advantages offered by magnons. Although magnonics still primarily positioned academic domain, scientific technological challenges being extensively investigated, proof-of-concept prototypes have already...
Micro-magnets are key components for quantum information processing with individual spins, enabling arbitrary rotations and addressability. In this work, characterization of sub-micrometer sized CoFe ferromagnets is performed Hall bars electrostatically defined in a two-dimensional electron gas. Due to the ballistic nature transport cross junction bar, anomalies such as quenched effect appear near zero external magnetic field, thus hindering sensitivity magnetometer small fields. However, it...
Quantum computing holds the promise of solving classically intractable problems. Enabling this requires scalable and hardware-efficient quantum processors with vanishing error rates. This perspective manuscript describes how bosonic codes, particularly grid state encodings, offer a pathway to fault-tolerant in superconducting circuits. By leveraging large Hilbert space modes, correction can operate at single physical unit level, therefore reducing drastically hardware requirements bring...
The Gottesman-Kitaev-Preskill (GKP) code encodes a logical qubit into bosonic system with resilience against single-photon loss, the predominant error in most systems. Here we present experimental results demonstrating quantum correction of GKP states based on reservoir engineering superconducting device. Error is made autonomous through an unconditional reset auxiliary transmon qubit. lifetime shown to be increased from correction, therefore reaching point at which more errors are corrected...
ZnxCd1-xS alloyed shells and Mn2+ ions were studied as means to confine charge carriers away from the surface of nanocrystals. In former case, electron confinement potential increased with Zn fraction in CdSe/ZnxCd1-xS colloidal quantum dots their photoluminescence blueshifted by ~50 nm. However, structural defects polydispersity became important samples x >0.7 likely due a phase transition strain increasing core/shell lattice mismatch reaching 12% when = 1. latter diffused within...
Abstract not Available.