A5065233825- Quantum and electron transport phenomena
- Adaptive Control of Nonlinear Systems
- Quantum Information and Cryptography
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Chaos control and synchronization
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Adaptive Dynamic Programming Control
- Neural Networks Stability and Synchronization
- Contact Mechanics and Variational Inequalities
- Quantum Computing Algorithms and Architecture
- Neural Networks and Applications
- Advanced Control Systems Design
- Atomic and Subatomic Physics Research
- Capital Investment and Risk Analysis
- Fuzzy and Soft Set Theory
- Quantum Mechanics and Applications
- Iterative Learning Control Systems
- Stochastic processes and financial applications
- Fractional Differential Equations Solutions
- Fault Detection and Control Systems
- Optimization and Variational Analysis
- Graphene research and applications
- Gold and Silver Nanoparticles Synthesis and Applications
Beijing Academy of Quantum Information Sciences
2024
Hefei University
2024
Shaanxi Normal University
2021-2024
Guangxi University of Finance and Economics
2016-2023
Minzu University of China
2023
Guangxi Special Equipment Inspection Institute
2020
Nanjing University
1995-2019
Institute of Physics
2013
Chinese Academy of Sciences
2013
We experimentally explore the topological Maxwell metal bands by mapping momentum space of condensed-matter models to tunable parameter superconducting quantum circuits. An exotic band structure that is effectively described spin-1 equations imaged. Threefold degenerate points dubbed are observed in bands. Moreover, we engineer and observe phase transition from a trivial insulator, report first experiment measure Chern numbers higher than one.Received 15 September 2017Revised 1 January...
We simulated highly tunable Weyl-semimetal bands using superconducting quantum circuits. Driving the circuits with microwave fields, we mapped momentum space of a lattice to parameter space, realizing Hamiltonian Weyl semimetal. By measuring energy spectrum, directly imaged points, whose topological winding numbers were further determined from Berry curvature measurement. In addition, manipulated band structure an additional pump field, producing momentum-dependent Weyl-point together...
Characterizing the nature of hydrodynamical transport properties in quantum dynamics provides valuable insights into fundamental understanding exotic non-equilibrium phases matter. Experimentally simulating infinite-temperature on large-scale complex systems is considerable interest. Here, using a controllable and coherent superconducting simulator, we experimentally realize analog circuit, which can efficiently prepare Haar-random states, probe spin at infinite temperature. We observe...
Besides serving as promising candidates for realizing quantum computing, superconducting circuits are one of a few macroscopic physical systems in which fundamental phenomena can be directly demonstrated and tested, giving rise to vast field intensive research work both theoretically experimentally. In this paper we report our on the fabrication circuits, starting from its building blocks: Al/AlOx/Al Josephson junctions. By using electron beam lithography patterning shadow evaporation, have...
This paper investigates the solvability and optimal control of fractional differential hemivariational inequalities (FDHVIs, for short). Firstly, we establish several sufficient assumptions FDHVIs to transform solution mappings into inclusions. Then, verify non-emptiness compactness set all mild solutions FDHVIs. Furthermore, discuss problems via some appropriate hypotheses. Finally, a typical example is presented illustrate our main results.
The backstepping technique is greatly effective for the integral-order triangular nonlinear systems. Nevertheless, it dramatically challenging to implement in manipulation of fractional-order permanent magnet synchronous motors (FOPMSMs), since fractional derivatives composite functions are deeply complex. In this paper, a fuzzy adaptive backstepping-based control scheme FOPMSMs on basis Lyapunov stability criterion established. First, we propose novel controller by coupling with logic...
Rhenium is a superconductor with relatively weak tendency to oxidize, which advantageous in superconducting quantum circuit and qubit applications. In this work, Re/Al—AlOx/Re Josephson tunnel junctions were fabricated using selective film-etching process similar that developed Nb trilayer technology. The Re films had transition temperature of 4.8 K width 0.2 K. found be highly reproducible the fabrication their characteristics good quality low leakage current showed gap 0.55 meV.
Isolated interacting quantum systems generally thermalize, yet there are several counterexamples for the breakdown of ergodicity, such as many-body localization and scars. Recently, ergodicity breaking has been observed in subjected to linear potentials, termed Stark localization. This phenomenon is closely associated with Hilbert-space fragmentation, characterized by a strong dependence dynamics on initial conditions. Here, we experimentally explore initial-state dependent using ladder-type...
We propose and experimentally demonstrate a novel protocol for transferring quantum states between superconducting cavities using only continuous two-mode squeezing interactions, without exchange of photonic excitations cavities. This approach conceptually resembles teleportation, where information is transferred different nodes directly transmitting carrier photons. In contrast to the discrete operations entanglement Bell-state measurement in our scheme symmetric continuous. realize...
High-order topological phases of matter refer to the systems n-dimensional bulk with topology m-th order, exhibiting (n-m)-dimensional boundary modes and can be characterized by pumping. Here, we experimentally demonstrate two types second-order pumps, forming four 0-dimensional corner localized states on a 4×4 square lattice array 16 superconducting qubits. The initial ground state system at half-filling, as product identical entangled 4-qubit states, is prepared using an adiabatic scheme....
We fabricate high-quality Al/AlO x /Al junctions using improved bridge and bridge-free techniques at 30-keV e-beam voltage, in which the length of undercut size junction can be well controlled by pre-exposure technique. The dose window is 5 times as large that used usual Dolan technique, making this technique much more robust. Similar results, comparable with those achieved a 100-keV writer, are obtained, indicate writer could an economic choice for superconducting qubit fabrication.
High-order topological phases of matter refer to the systems $n$-dimensional bulk with topology $m$-th order, exhibiting $(n-m)$-dimensional boundary modes and can be characterized by pumping. Here, we experimentally demonstrate two types second-order pumps, forming four 0-dimensional corner localized states on a 4$\times$4 square lattice array 16 superconducting qubits. The initial ground state system for half-filling, as product identical entangled 4-qubit states, is prepared using an...
Building large-scale quantum computers from smaller modules offers a solution to many formidable scientific and engineering challenges. Nevertheless, high-fidelity interconnects between remains challenging. In recent years, state transfer (QST) has provided way establish entanglement two separately packaged devices. However, QST is not unitary gate, thus cannot be directly inserted into circuit, which widely used in computation studies. Here we report demonstration of direct CNOT gate...
Abstract In this paper, we investigate hybrid adaptive synchronization issue for a class of perturbed fractional-order chaotic systems with nondeterministic nonlinear terms. On the basis extended version Lyapunov stability criterion, novel fuzzy control protocol coupled backstepping-based method is constructed, ensuring that errors converge to sufficiently small region origin. order avert occurrence “explosion complexity”, take advantage logic system estimate unknown systematic term...
Measurements of three-junction flux qubits, both single qubits and coupled using a direct current superconducting quantum interference device (dc-SQUID) for readout are reported. The measurement procedure is described in detail. We performed spectroscopy measurements coherent manipulations the qubit states on qubit, demonstrating energy levels Rabi oscillations, with oscillation decay time TRabi = 78 ns relaxation T1 315 ns. found that value depends strongly mutual inductance between...
We present the design of a superconducting flux qubit with large loop inductance. The inductance is desirable for coupling between qubits. configured into gradiometer form that could reduce interference from environmental magnetic noise. A combined Josephson junction, i.e., DC-SQUID used to replace small junction in usual 3-JJ (Josephaon junction) qubit, leading tunable energy gap by using an independent external line. perform numerical calculations investigate dependence on parameters such...
In this paper, the state-constrained adaptive control problem for a class of uncertain fractional-order nonlinear systems with unknown external disturbances is studied. Using fuzzy approximation and backstepping layout, an disturbance-observer-based method proposed, which can effectively estimate through designed disturbance observers. As we know, standard has inherent computational complexity. Therefore, design approach command filter introduced, takes advantage to pre-estimate virtual...
Abstract This article prices American-style continuous-installment options in the constant elasticity of variance (CEV) diffusion model where volatility is a function stock price. We derive semi-closed form formulas for American using Kim’s integral representation method and then obtain closed-form solutions by approximating optimal exercise stopping boundaries as step functions. demonstrate speed-accuracy our approach different parameters CEV model. Furthermore, effects on both option price...