Quantum computation relies on accurate measurements of qubits not only for reading the output calculation, but also to perform error correction. Most proposed scalable silicon architectures utilize Pauli blockade triplet states spin-to-charge conversion. In recent experiments, there have been instances when instead conventional readout, is sustained between parallel spin configurations, with $|T_0\rangle$ relaxing quickly singlet state and leaving $|T_+\rangle$ $|T_-\rangle$ blockaded --...

Transmon qubits are ubiquitous in the pursuit of quantum computing using superconducting circuits. However, they have some drawbacks that still need to be addressed. Most importantly, scalability transmons is limited by large device footprint needed reduce participation lossy capacitive parts circuit. In this work, we investigate and evaluate losses an alternative geometry, namely, merged-element transmon (mergemon). To end, replace external shunt capacitor a traditional with intrinsic...

Nanoscale single-electron pumps can be used to generate accurate currents, and potentially serve realize a new standard of electrical current based on elementary charge. Here, we use silicon-based quantum dot with tunable tunnel barriers as an source quantized current. The charge transfer accuracy our pump dramatically enhanced by controlling the electrostatic confinement using purposely engineered gate electrodes. Improvements in operational robustness, well suppression non-adiabatic...

This paper studies a multiple-input dc-dc converter realized from standard single ended primary inductor topology. The proposed configuration allows the integration of different distributed generation sources into common DC main bus. work discusses topology, basic dynamic equations, and explains its operation. Stability characteristics are also explored with linear methods. Theoretical analyses verified simulations experimental results.

Single-electron spin qubits employ magnetic fields on the order of 1 Tesla or above to enable quantum state readout via spin-dependent-tunnelling. This requires demanding microwave engineering for coherent resonance control, which limits prospects large scale multi-qubit systems. Alternatively, singlet-triplet enables high-fidelity spin-state measurements in much lower fields, without need reservoirs. Here, we demonstrate low-field operation metal-oxide-silicon dot by combining single-spin...

Single-electron pumps based on quantum dots (QDs) with tunable barriers are promising candidates for the emerging standard of electrical current, but accuracy at elevated reservoir temperatures can be challenging. In this study, a planar silicon QD achieves accurate, high-speed single-electron pumping in thermal regime, where temperature could rise to few kelvin. This device operates without demanding conditions previous experiments, indicating that it deliver cost-effective and easily...

This paper explores the multiple-input isolated single ended primary inductor converter (MIISEPIC) and discusses its design considerations for low power distributed generation (DG) sources, such as PV modules. The first analyzes operation of MIISEPIC, investigates controllable input current ranges that can affect loop design, maximum point control, tradeoffs between achievable efficiency. Moreover, a novel driving strategy is proposed to improve efficiency operational flexibility. A proper...

Sensitive charge detection has enabled qubit readout in solid-state systems. Recently, an alternative to the well-established via on-chip electrometers emerged, based on situ gate detectors and radio-frequency dispersive techniques. This approach promises facilitate scalability by removing need for additional device components devoted sensing. Here, we perform gate-based of accumulation-mode silicon quantum dot. We observe that response detector is significantly affected its bias voltage,...

Epitaxially grown superconductor/dielectric/superconductor trilayers have the potential to form high-performance superconducting quantum devices and may even allow scalable computing with low-surface-area qubits such as merged-element transmon. In this work, we measure power-independent loss two-level-state (TLS) of epitaxial, wafer-bonded, substrate-removed Al/GaAs/Al by measuring lumped element microwave resonators at millikelvin temperatures down single-photon powers. The device is...

This paper discusses design considerations of power electronics interfaces between renewable energy sources and storage. When sources-including photovoltaic modules, wind generators, fuel cells-are used to generate power, there are certain electrical properties each source that need be considered for the storage interface. In addition, storage's charging discharging characteristics also in order maintain its long life high reliability. this paper, discussed obtain interfaces. Moreover,...

The authors propose and realize experimentally a method based on distributions of waiting times to determine the optimal working regime charge detector. This proposal includes finite-bandwidth superconducting sensor directly extract short timescales transitions in strongly-coupled two-level fluctuator.

This paper studies modeling of multiple-input converters (MICs). Many MICs are based on a time division multiplexing scheme. In the dynamic equations such an MIC, state variable from one input leg is possible to be affected by variables other cells, and all switching functions. this way, inputs coupled both topologically control actions through Input-coupling effects complicate MICs' behavior. Consequently, substantial errors may occur when classical averaging approach utilized model MIC...

This paper studies the close-loop multiple-input converters (MIC) stabilization through a decentralized controller. For an MIC, multiple-input-multiple-output (MIMO) state-space representation can be derived by averaging method. Based on averaged MIMO model, small-signal model generated. Both conventional method and multivariable frequency analysis are applied to of Single Ended Primary Inductor Converter (MI SEPIC) as case study, in which open-loop closed-loop characteristics explored. In...

High-fidelity single- and two-qubit gates are essential building blocks for a fault-tolerant quantum computer. While there has been much progress in suppressing single-qubit gate errors superconducting qubit systems, still suffer from error rates that orders of magnitude higher. One limiting factor is the residual ZZ-interaction, which originates coupling between computational states higher-energy states. this interaction usually viewed as nuisance, here we experimentally demonstrate it can...

This paper studies the control of multiple-input-multiple-output (MIMO) dc-dc converter serving as an active distribution node for intelligent dc grid. The unified model a MIMO is derived, which allows systematical analysis and design without considering specific operating modes input/output modules. For derived high-order multivariable model, robust controller designed via linear matrix inequality (LMI) synthesis with disturbance-attenuation pole-placement constraints. verified by...

Schottky Barrier (SB)-MOSFET technology offers intriguing possibilities for cryogenic nano-scale devices, such as Si quantum devices and superconducting devices. We present experimental results on a novel device architecture where the gate electrode is self-aligned with channel overlaps source drain electrodes. This facilitates sub-5 nm gap between source/drain channel, no spacers are required. At temperatures, function p-MOS Tunnel FETs, determined by barrier at Al-Si interface, further...

This paper presents key design aspects for achieving high efficiency in a family of non-isolated multiple-input converters (MICs). Many MIC topologies are based on time-multiplexing (TM) scheme that relies forward-conducting-bidirectional-blocking (FCBB). However, these switches tend to increase power losses TM-MIC. The significance the proposed strategies is exemplified through experiments with SEPIC which originally operates at about 85 % efficiency. It shown output from 1 W 220 W,...

A compound-structure permanent-magnet synchronous machine (CS-PMSM) system used for hybrid electric vehicles (HEVs) enables an internal combustion engine (ICE) to operate within optimum efficiency region independent of road conditions, thus decreasing the emissions and fuel consumption. In this paper a radial-radial-flux CS-PMSM is investigated. It integrates two machines radially, one called Double-Rotor Machine (DRM) other Stator (SM). downsized prototype was designed manufactured, tests...

The rapid progress of hole spin qubits in group IV semiconductors has been driven by their potential for scalability. This is due to the compatibility with industrial manufacturing standards, as well ease operation and addressability via all-electric drives. However, owing a strong spin-orbit interaction, these systems present variability anisotropy key qubit control parameters such Land\'e $g$-factor, requiring careful characterization reliable operation. Here, we experimentally investigate...

This paper explores important characteristics of multiple-input converters (MIC) serving as a power electronic interface for renewable energy applications. Advantages MICs are explained through an example with photovoltaic (PV) system. Feasible MIC topologies applications discussed and classified into four different families. According to their configurations, each family is suggested certain Furthermore, possible operating issues MICs, such relatively low efficiency, also discussed. Design...

Due to their unique properties as lossless, nonlinear circuit elements, Josephson junctions lie at the heart of superconducting quantum information processing. Previously, we demonstrated a two-layer, submicrometer-scale overlap junction fabrication process suitable for qubits with long coherence times. Here, extend micrometer-scale junctions. This allows us fabricate other devices. For example, demonstrate an overlap-junction-based parametric amplifier that uses only 2 layers. efficient...

Epitaxial Al/GaAs/Al structures having controlled thickness of high-quality GaAs and pristine interfaces have been fabricated using a wafer-bonding technique. III–V semiconductor/Al are grown by molecular beam epitaxy on semiconductor substrates bonded to silicon sapphire. Selective etching is used remove the substrate followed surface cleaning superconductor regrowth, resulting in epitaxial tri-layers sapphire or substrates. Structures characterized with reflection high energy electron...

This paper studies the application of multiport converters in downhole via a novel dual-input dual-switch forward converter. Due to harsh environment and increasing power consumption downhole, few existing generation technologies could independently meet needs reliability requirements. With converters, multiple sources can be efficiently integrated may also achieve higher reliability, efficiency, component saving. In proposed topology, an auxiliary input is controlled by merely adding diode...