A5009596203- Astrophysics and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Dark Matter and Cosmic Phenomena
- Quantum Information and Cryptography
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Quantum Computing Algorithms and Architecture
- Particle Detector Development and Performance
- Semiconductor materials and devices
- ZnO doping and properties
- Superconductivity in MgB2 and Alloys
- Iron-based superconductors research
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Magnetic and transport properties of perovskites and related materials
- Quantum many-body systems
- Advanced Condensed Matter Physics
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Electronic and Structural Properties of Oxides
- Magnetic properties of thin films
- Advanced Thermodynamics and Statistical Mechanics
- Gas Sensing Nanomaterials and Sensors
- Superconducting and THz Device Technology
Chinese Academy of Sciences
2014-2025
Songshan Lake Materials Laboratory
2022-2025
Purple Mountain Observatory
2019-2025
University of Chinese Academy of Sciences
2018-2025
Second Hospital of Liaohe Oilfield
2025
Qufu Normal University
2025
Institute of Engineering Thermophysics
2025
Institute of Physics
2013-2024
Institute of High Energy Physics
2019-2024
Shandong University
2020-2024
We report, for the first time, long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in Galactic disk. Particularly, all above 398 are observed apart from known gamma-ray sources compatible expectations hadronic emission scenario which originate decay $π^0$'s produced through interaction protons interstellar medium Galaxy. This is strong evidence that cosmic accelerated beyond our Galaxy spread over
Abstract Quantum simulation enables study of many-body systems in non-equilibrium by mapping to a controllable quantum system, providing powerful tool for computational intractable problems. Here, using programmable processor with chain 10 superconducting qubits interacted through tunable couplers, we simulate the one-dimensional generalized Aubry-André-Harper model three different phases, i.e., extended, localized and critical phases. The properties phase transitions dynamics are studied...
Stimulated Raman adiabatic passage (STIRAP) offers significant advantages for coherent population transfer between un- or weakly-coupled states and has the potential of realizing efficient quantum gate, qubit entanglement, information transfer. Here we report on realization STIRAP in a superconducting phase qutrit - ladder-type system which ground state is coherently transferred to second-excited via dark subspace. The result agrees well with numerical simulation master equation, further...
Operator spreading, often characterized by out-of-time-order correlators (OTOCs), is one of the central concepts in quantum many-body physics. However, measuring OTOCs experimentally challenging due to requirement reversing time evolution systems. Here we apply Floquet engineering investigate operator spreading a superconducting 10-qubit chain. provides an effective way tune coupling strength between nearby qubits, which used demonstrate walks with tunable couplings, reversed evolution, and...
Quantum simulation of different exotic topological phases quantum matter on a noisy intermediate-scale (NISQ) processor is attracting growing interest. Here, we develop one-dimensional 43-qubit superconducting processor, named Chuang-tzu, to simulate and characterize emergent states. By engineering diagonal Aubry-André-Harper (AAH) models, experimentally demonstrate the Hofstadter butterfly energy spectrum. Using Floquet engineering, verify existence zero modes in commensurate off-diagonal...
Abstract Diffuse γ -ray emission between 10 and 1000 TeV from the Galactic plane was recently measured by Large High Altitude Air Shower Observatory (LHAASO). These observations will help tremendously in constraining propagation interaction of cosmic rays Milky Way. Additionally, new measurements cosmic-ray spectra reach a very high precision up to 100 energies, revealing multiple spectral structures various species. In this work, based on up-to-date local simplified setup, we confront model...
(1) Background: Identifying ecological security patterns and restoring the Beijing-Hangzhou Grand Canal in Shandong is vital for future conservation maintaining ecosystem sustainability. (2) Methods: The study area was selected, InVEST3.9.0 model used to assess natural-environment services. An optimal evaluation approach based on Minimum Cumulative Resistance developed define pattern. (3) Results: There were 20 source areas lower east portions of area, mainly grasslands, forests, water...
Topological phases are robust against weak perturbations, but break down when disorder becomes sufficiently strong. However, moderate can also induce topologically nontrivial phases. Thouless pumping, as a (1+1)D counterpart of the integer quantum Hall effect, is one simplest manifestations topology. Here, we report experimental observations competition and interplay between pumping on 41-qubit superconducting processor. We improve Floquet engineering technique to realize cycles adiabatic by...
Current research on the sealing reliability and unsealing safety evaluation of all-metal sealed K361 thermal recovery packer remains largely unexplored. This paper addresses this gap by establishing a mathematical model for mechanical analysis that incorporates shadow response during expansion contact process, based an packer's structure characteristics. Utilizing ANSYS software, study simulates analyzes stress, deformation, residual deformation under variations in effective length, inner...
Metal-Insulator-Metal tunnel junctions (MIMTJ) are common throughout the microelectronics industry. The industry standard AlOx barrier, formed through oxygen diffusion into an Al wetting layer, is plagued by internal defects and pinholes which prevent realization of atomically-thin barriers demanded for enhanced quantum coherence. In this work, we employed in situ scanning tunneling spectroscopy (STS) along with molecular dynamics simulations to understand control growth atomically thin...
We report on the first unambiguous observation of macroscopic quantum tunneling (MQT) in a single submicron ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ surface intrinsic Josephson junction (IJJ) by measuring its temperature-dependent switching current distribution. All relevant parameters were determined situ classical regime and used to predict behavior IJJ via MQT theory. Experimental results agree quantitatively with theoretical predictions,...
Quantum phase diffusion in a small underdamped Nb/AlO$_x$/Nb junction ($\sim$ 0.4 $\mu$m$^2$) is demonstrated wide temperature range of 25-140 mK where macroscopic quantum tunneling (MQT) the dominant escape mechanism. We propose two-step transition model to describe switching process which rate out potential well and from running state are considered. The extracted experimental current distribution follows predicted Arrhenius law thermal regime but greatly enhanced when MQT becomes dominant.
The accurate expression of postsynaptic AMPA receptors (AMPARs) is critical for information processing in the brain, and ubiquitination a key regulator this biological process. However, roles E3 ubiquitin ligases regulation AMPARs are poorly understood. Here, we find that RNF220 directly interacts with to meditate their polyubiquitination, knockout specifically increases AMPAR protein levels, thereby enhancing basal synaptic activity while impairing plasticity. Moreover, depending on its...
The relationship between the cuprate pseudogap (Δ(p)) and superconducting gap (Δ(s)) remains an unsolved mystery. Here, we present a temperature- doping-dependent tunneling study of submicron Bi(2)Sr(2)CaCu(2)O(8+δ) intrinsic Josephson junctions, which provides clear evidence that Δ(s) closes at temperature T(c) (0) well above transition but far below opening T*. We show pairing first occurs predominantly on limited Fermi surface near node (0), accompanied by arc due to lifetime effects...
Superconducting quantum bits (qubits) and circuits are the leading candidate for implementation of solid-state computation. They have also been widely used in a variety studies physics, atomic optics, simulation. In this article, we will present an overview basic principles superconducting qubits, including phase, flux, charge, transmon (Xmon) progress achieved so far concerning improvements device design coherence property. Experimental various research fields using qubits be briefly reviewed.
We explore a topology-localization phase diagram by simulating one-dimensional Su-Schrieffer-Heeger model with quasiperiodic disorder using programmable superconducting simulator. experimentally map out and identify various trivial topological phases extended, critical, localized bulk states. find that increasing strength, some extended states can be first replaced then critical before the system finally becomes fully localized. The exhibit typical features such as multifractality...
The self-heating effect on intrinsic tunneling spectra (ITSs) is investigated using stacks of Josephson junctions (IJJs) in near optimally doped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ crystals. area the $S$ ranges from 12 down to $0.16\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}{\mathrm{m}}^{2}$. For IJJs with larger $S$, ITSs are distorted by self-heating, but become progressively less size dependent as decreases submicrometer...