We propose a method to realize microwave-activated cz gates between two remote spin qubits in quantum dots using a charge-sensitive superconducting coupler. The qubits are longitudinally coupled to the coupler, such t...
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We propose a method to realize microwave-activated cz gates between two remote spin qubits in quantum dots using a charge-sensitive superconducting coupler. The qubits are longitudinally coupled to the coupler, such that the transition frequency of the coupler depends on the logical qubit states; a capacitive network model using first-quantized charge operators is developed to illustrate this. Driving the coupler transition then implements a conditional phase shift on the qubits. Two pulsing schemes are investigated: a rapid, off-resonant pulse with constant amplitude, and a pulse with envelope engineering that incorporates dynamical decoupling to mitigate charge noise. We develop non-Markovian time-domain simulations to accurately model gate performance in the presence of 1/fβ charge noise. Simulation results indicate that a cz gate fidelity exceeding 90% is possible with realistic parameters and noise models.
Two-dimensional(2D)transition metal dichalcogenides(TMDCs)have attracted growing interest regarding their potential applications in next-generation electronic and optoelectronic *** to their atomic thickness and tunab...
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Two-dimensional(2D)transition metal dichalcogenides(TMDCs)have attracted growing interest regarding their potential applications in next-generation electronic and optoelectronic *** to their atomic thickness and tunable bandgap,they exhibit unique mechanical,electrical,and optical *** a specific member of the TMDC family,rhenium disulfide(ReS_(2))has stimulated intensive interest due to its anisotropic crystal structure,weak inter-layer coupling,and anisotropic electrical and optical *** this review,we summarize the distinct crystal structure and intrinsic anisotropic properties of ReS_(2),followed by an introduction to its synthesis *** current applications of ReS_(2)and its heterojunctions are presented based on its anisotropic *** review not only provides a timely summary of the current applications of ReS_(2)and its heterojunctions,but also inspires new approaches to develop other innovative devices based on 2D materials with a low lattice symmetry.
Existing methods for synchrophasor data analysis focus on oscillations that can be interpreted as a sum of sinusoids with or without damping, however, they are more difficult to apply when considering other types of w...
Existing methods for synchrophasor data analysis focus on oscillations that can be interpreted as a sum of sinusoids with or without damping, however, they are more difficult to apply when considering other types of waveforms. This paper investigates how to apply spectral estimation analysis methods when analyzing a periodic voltage sag whose waveform is comparable to a periodic pulse train. A methodology is proposed where the estimated power spectral density and spectrograms are used to detect the area impacted by a periodic sag and to identify its dominant propagation path, which helps with the localization of the disturbance’s spread. The proposed methodology is applied to measurement data obtained from a region in Dominion Energy’s service territory that is geographically bounded by other utilities, which validates the effectiveness of the proposed method in a real-world utility setting.
Learning rewards from human behavior or feedback is a promising approach to aligning AI systems with human values but fails to consistently extract correct reward functions. Interpretability tools could enable users t...
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This paper examines the problem of optimizing the charging pattern of electric vehicles (EV) by taking real-time electricity grid carbon intensity into consideration. The objective of the proposed charging scheme is t...
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Underfrequency load shedding (UFLS) schemes are traditionally implemented in two ways. One approach is based on manual load shedding implemented by system operators. The second approach is automatic load shedding, imp...
Underfrequency load shedding (UFLS) schemes are traditionally implemented in two ways. One approach is based on manual load shedding implemented by system operators. The second approach is automatic load shedding, implemented through underfrequency relays. The main limitation of traditional load shedding schemes is that they are reactive and leave little room for optimized corrective actions. This work presents a proactive and automatic underfrequency load shedding framework for power systems. Measurements are captured via phasor measurement units (PMUs) at relatively low rates of 30 fps. These measurements are then processed by a particle filter which predicts the future state of frequency. Based on these predictions excess loading is determined and shed. Comparative case studies are performed via simulations. Easy-to-implement models, without hard-to-derive parameters, highlight the potential for real-life implementation.
We consider the single-satellite, single-pass localization of ground electromagnetic interference (EMI) sources to protect the quality of service in satellite communications. For a stationary EMI source, the analysis ...
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ISBN:
(数字)9798350354058
ISBN:
(纸本)9798350354065
We consider the single-satellite, single-pass localization of ground electromagnetic interference (EMI) sources to protect the quality of service in satellite communications. For a stationary EMI source, the analysis of the time-varying Doppler signature caused by satellite motion provides valuable information for its localization. Due to the high-speed motion of the satellite, the instantaneous Doppler frequency exhibits a high dynamic range and significant nonlinearity. To address this, we previously developed a knowledge-aided signal stationarization approach using the concept of virtual ground references (VGR), thereby enabling a reduced sampling rate, extended coherent processing time, and improved EMI detectability and accuracy. In this paper, we propose several extended approaches, including simplified multi-VGR data fusion as well as iterative and sequential EMI localization methods, to further enhance EMI localization performance while reducing processing complexity.
The aim of reducing carbon emissions through the digitization of the energy sector involves several challenges. One potential solution is the integration of renewable energy sources; however, the volatile and intermit...
The aim of reducing carbon emissions through the digitization of the energy sector involves several challenges. One potential solution is the integration of renewable energy sources; however, the volatile and intermittent nature of this type of energy requires precise forecasting. This paper presents a novel, intelligent information system that covers the entire data lifecycle in the energy sector, including data acquisition, processing and storage, model development and training, and a user-friendly web application. The system was tested in three real-life use cases and demonstrated effectiveness and versatility in addressing the intricate data challenges faced by the energy industry. The paper concludes with suggestions for further research in this area.
With the pervasiveness of Stochastic Shortest-Path (SSP) problems in high-risk industries, such as last-mile autonomous delivery and supply chain management, robust planning algorithms are crucial for ensuring success...
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The advancement of satellite technologies in future space missions is limited by the antiquated power architectures with low efficiencies and small power densities. The power converter architecture proposed in this wo...
The advancement of satellite technologies in future space missions is limited by the antiquated power architectures with low efficiencies and small power densities. The power converter architecture proposed in this work was designed as part of the Breakthrough Distributed Power Architecture (BDPA) program for the NASA Jet Propulsion laboratory that takes advantage of modern, highly efficient resonant isolated topologies like the LLC with switching strategies like zero voltage switching (ZVS) while using all space rated components. This work presents a 200 W, 1 MHz switching frequency, cascaded Buck-LLC resonant converter that is oriented for radiation hardened (rad-hard) space applications and achieves high efficiency by taking advantage of Gallium Nitride (GaN) devices. The converter achieves a peak efficiency of 91 %, a 10 % improvement over other currently available converters in its power and voltage range while maintaining a 100krad, 75MeV-cm 2 /mg radiation hardness.
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