Chungwei Lin
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View article: Time-optimal single-scalar control on a qubit of unitary dynamics
Time-optimal single-scalar control on a qubit of unitary dynamics Open
Optimal control theory is applied to analyze the time-optimal solution with a single scalar control knob in a two-level quantum system without quantum decoherence. Emphasis is \change{placed} on the dependence on the maximum control streng…
View article: Induction Motor Eccentricity Fault Detection and Quantification Using Topological Data Analysis
Induction Motor Eccentricity Fault Detection and Quantification Using Topological Data Analysis Open
In this paper, we propose a topological data analysis (TDA) method for the processing of induction motor stator current data, and apply it to the detection and quantification of eccentricity faults. Traditionally, physics-based models and …
View article: Path Generation Based on Electrostatic Equipotential Curves
Path Generation Based on Electrostatic Equipotential Curves Open
Path planning for a point-mass robot moving in a cluttered two-dimensional environment is a well studied but non-trivial problem. In this paper we propose a novel computationally efficient and resolution-complete path generation method bas…
View article: Asymptotic behavior of continuous weak measurement and its application to real-time parameter estimation
Asymptotic behavior of continuous weak measurement and its application to real-time parameter estimation Open
The asymptotic quantum trajectory of weak continuous measurement for the magnetometer is investigated. The magnetometer refers to a setup where the field-to-estimate and the measured moment are orthogonal, and the quantum state is governed…
View article: Application of Pontryagin's maximum principle to quantum metrology in dissipative systems
Application of Pontryagin's maximum principle to quantum metrology in dissipative systems Open
Optimal control theory, also known as Pontryagin's Maximum Principle, is applied to the quantum parameter estimation in the presence of decoherence. An efficient procedure is devised to compute the gradient of quantum Fisher information wi…
View article: Optimal control for quantum metrology via Pontryagin's principle
Optimal control for quantum metrology via Pontryagin's principle Open
Quantum metrology comprises a set of techniques and protocols that utilize\nquantum features for parameter estimation which can in principle outperform any\nprocedure based on classical physics. We formulate the quantum metrology in\nterms…
View article: Stochastic optimal control formalism for an open quantum system
Stochastic optimal control formalism for an open quantum system Open
A stochastic procedure is developed which allows one to express Pontryagin's maximum principle for dissipative quantum system solely in terms of stochastic wave functions. Time-optimal controls can be efficiently computed without computing…
View article: Erratum: “Optical properties of transition metal oxide quantum wells” [J. Appl. Phys. 117, 034304 (2015)]
Erratum: “Optical properties of transition metal oxide quantum wells” [J. Appl. Phys. 117, 034304 (2015)] Open
View article: Time-optimal control of a dissipative qubit
Time-optimal control of a dissipative qubit Open
A formalism based on Pontryagin's maximum principle is applied to determine\nthe time-optimal protocol that drives a general initial state to a target state\nby a Hamiltonian with limited control, i.e., there is a single control field\nwit…
View article: Ferroelectric memory field-effect transistors using CVD monolayer MoS2 as resistive switching channel
Ferroelectric memory field-effect transistors using CVD monolayer MoS2 as resistive switching channel Open
Ferroelectric field-effect transistors (FeFETs) have been considered as promising electrically switchable nonvolatile data storage elements due to their fast switching speed, programmable conductance, and high dynamic range for neuromorphi…
View article: Application of Pontryagin's minimum principle to Grover's quantum search problem
Application of Pontryagin's minimum principle to Grover's quantum search problem Open
Grover's algorithm is one of the most famous algorithms which explicitly demonstrates how the quantum nature can be utilized to accelerate the searching process. In this work, Grover's quantum search problem is mapped to a time-optimal con…
View article: Band alignment in quantum wells from automatically tuned DFT+<i>U</i>
Band alignment in quantum wells from automatically tuned DFT+<i>U</i> Open
Accurate band offsets in III–V zinc blende-alloy quantum wells were obtained computationally with the DFT+U method automatically tuned to reproduce bulk properties.
View article: Performance comparison between photovoltaic and thermoradiative devices
Performance comparison between photovoltaic and thermoradiative devices Open
Photovoltaic (PV) and thermoradiative (TR) devices are power generators that use the radiative energy transfer between a hot and a cold reservoir. For PV devices, the semiconductor at the cold side (PV cell) generates electric power; for T…
View article: Optimal boson energy for superconductivity in the Holstein model
Optimal boson energy for superconductivity in the Holstein model Open
We examine the superconducting solution in the Holstein model, where the\nconduction electrons couple to the dispersionless Boson fields, using the\nMigdal-Eliashberg theory and Dynamical Mean Field Theory. Although different in\nnumerical…
View article: Quench dynamics of Anderson impurity model using configuration interaction method
Quench dynamics of Anderson impurity model using configuration interaction method Open
We study the quench dynamics of an Anderson impurity model using the configuration interaction (CI) method. In particular, we focus on the relaxation behavior of the impurity occupation. The system is found to behave very differently in th…
View article: Final-state effect on x-ray photoelectron spectrum of nominally $d^1$ and $n$-doped $d^0$ transition metal oxides
Final-state effect on x-ray photoelectron spectrum of nominally $d^1$ and $n$-doped $d^0$ transition metal oxides Open
We investigate the x-ray photoelectron spectroscopy (XPS) of nominally $d^1$ and $n$-doped $d^0$ transition metal oxides including NbO$_2$, SrVO$_3$, and LaTiO$_3$ (nominally $d^1$), as well as $n$-doped SrTiO$_3$ (nominally $d^0$). In the…
View article: Localized states induced by an oxygen vacancy in rutile TiO2
Localized states induced by an oxygen vacancy in rutile TiO2 Open
Using density functional theory and model Hamiltonian analysis, we investigate the localized states induced by an oxygen vacancy in rutile TiO2. We identify two classes of localized states—the hybrid and the polaron. The hybrid state is ca…
View article: Quantum confinement in transition metal oxide quantum wells
Quantum confinement in transition metal oxide quantum wells Open
We report on the quantum confinement in SrTiO3 (STO) quantum wells (QWs) grown by molecular beam epitaxy. The QW structure consists of LaAlO3 (LAO) and STO layers grown on LAO substrate. Structures with different QW thicknesses ranging fro…
View article: Optical properties of transition metal oxide quantum wells
Optical properties of transition metal oxide quantum wells Open
Fabrication of a quantum well, a structure that confines the electron motion along one or more spatial directions, is a powerful method of controlling the electronic structure and corresponding optical response of a material. For example, …