A5018468337- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Magnetic and transport properties of perovskites and related materials
- Quantum optics and atomic interactions
- Advanced Condensed Matter Physics
- Atomic and Subatomic Physics Research
- Multiferroics and related materials
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Frequency and Time Standards
- Physics of Superconductivity and Magnetism
- Acoustic Wave Resonator Technologies
- Ferroelectric and Piezoelectric Materials
- Quantum and electron transport phenomena
- Rare-earth and actinide compounds
- Magnetic Properties and Applications
- Non-Destructive Testing Techniques
- Welding Techniques and Residual Stresses
- Laser-Matter Interactions and Applications
- Quantum, superfluid, helium dynamics
- Laser and Thermal Forming Techniques
- Radiation Effects in Electronics
- Mechanical and Optical Resonators
- Magneto-Optical Properties and Applications
- Transition Metal Oxide Nanomaterials
QuantumCTek (China)
2025
Chinese Academy of Sciences
2013-2024
Shanghai Institute of Optics and Fine Mechanics
2018-2024
University of Chinese Academy of Sciences
2020-2024
Chengdu University of Technology
2024
Southeast University
2024
Institute of Solid State Physics
2003-2022
Collaborative Innovation Center of Advanced Microstructures
2004-2022
High Magnetic Field Laboratory
2009-2022
Institute of Acoustics
2019-2021
We demonstrate high fidelity two-qubit Rydberg blockade and entanglement on a pair of sites in large two-dimensional qubit array. The array is defined by grid blue detuned lines light with 121 for trapping atomic qubits. Improved experimental methods have increased the observed Bell state to F_{Bell}=0.86(2). Accounting errors preparation measurement we infer F_{Bell}^{-SPAM}=0.88. single operations that created mediated C_{Z} gate has F_{Bell}^{C_{Z}}=0.89. Comparison detailed error model...
We present experimental results on two-qubit Rydberg blockade quantum gates and entanglement in a two-dimensional qubit array. Without post selection against atom loss we achieve Bell state fidelity of $0.73\pm 0.05$, the highest value reported to date. The experiments are performed an array single Cs qubits with site spacing $3.8 ~ \mu\rm m$. Using standard protocol for C$_Z$ gate together operations create states measure their using parity oscillations. analyze role AC Stark shifts that...
The neutral atom platform has become an attractive choice to study the science of quantum information and simulation, where intense efforts have been devoted entangling processes between individual atoms. A two-qubit controlled-phase gate via Rydberg blockade is one most essential elements. Recent theoretical studies suggested advantages introducing nontrivial waveform modulation into protocol, which anticipated improve its performance towards next stage. We report our recent experimental...
The effect of grain size on electrical and magnetic properties La0.67Sr0.33MnO3 nanoparticles with average 32–85 nm has been investigated. metal-insulator transition temperature TP gradually decreases decreasing size, while the ferromagnetic-paramagnetic TC remains almost constant. For 32 sample, larger effective moments deviation inverse susceptibility from Curie–Weiss law are observed, indicating possible existence a Griffiths-like cluster phase. ferromagnetic samples is further...
DyFe0.5Cr0.5O3 has been synthesized using a sol-gel method. It exhibits ferroelectricity at the antiferromagnetic ordering temperature TN1∼261 K. Large magnetocaloric effect (MCE) (11.3 J/kg K 4.5 T) enhanced by magnetoelectric coupling due to magnetic field and induced transition was observed. Temperature-dependent Raman study shows an anomalous behavior near TN1 in phonon modes related vibration of Dy atoms stretching CrO6/FeO6 octahedra, suggesting is associated with spin-phonon respect...
The magnetic and dielectric properties of Bi6Fe2Ti3O18, Bi6FeCoTi3O18, Bi5LaFeCoTi3O18 are investigated. room-temperature ferromagnetism is observed in the samples Bi6FeCoTi3O18 compared with paramagnetic behavior Bi6Fe2Ti3O18 at room temperature. can be ascribed to spin canting Fe-based Co-based sublattices via antisymmetric Dzyaloshinskii-Moriya interaction. frequency-dependent loss peak manifests itself a thermally activated relaxation process. rather large activation energy (2.62 ± 0.11...
The magnetic and ferroelectric properties of Co-doped Bi6Fe2Ti3O18 thin films Bi6Fe2−xCoxTi3O18 (BFCTO) (0 ≤x≤ 1) are investigated. coexistence room-temperature ferromagnetism ferroelectricity is observed in BFCTO films. x = 0.6 sample exhibits a higher remnant magnetization Mr 8.41 emu/cm3 polarization Pr 17.6 μC/cm2 compared with other can be ascribed to the spin canting Fe- Co-based sublattices via Dzyaloshinskii-Moriya interaction [I. Dzyaloshinsky, J. Phys. Chem. Solids 4, 241 (1958);...
The generation of nonclassical photon pairs with a long coherence time is key for applications that range from fundamental to quantum communication and metrology. Spontaneous four-wave mixing electromagnetically induced transparency has been demonstrated as one the most efficient methods; however, narrowing bandwidth producing temporal length beyond 1 μs remains technical challenge due noise considerations need cold atoms high optical depth (OD). In this work, we demonstrate narrowband...
We demonstrate that a single photon with an optimal temporal waveform can be efficiently loaded into cavity. Using heralded narrow-band photons exponential growth wave packet shaped by electro-optical amplitude modulator, whose time constant matches the lifetime in cavity, we loading efficiency of (87±2)% from free space to single-sided Fabry-Perot further directly Stokes cavity (60±5)% without modulator and verify reversal between frequency-entangled paired photons. Our result approach may...
We demonstrate a technique for shaping the temporal wave function of biphotons generated from spatially modulated spontaneous four-wave mixing in cold atoms. show that spatial profile pump field can be mapped onto biphoton group delay regime. The laser beam is shaped by using light modulator. This spatial-to-temporal mapping enables generation narrow-band with controllable waveforms.
For the quantum error correction (QEC) and noisy intermediate-scale (NISQ) algorithms to function with high efficiency, raw fidelity of logic gates on physical qubits needs satisfy strict requirement. The neutral atom computing equipped Rydberg blockade has made impressive progress recently, which makes it worthwhile explore its potential in two-qubit entangling gates, including Controlled-PHASE gate particular CZ gate. Provided coherence is well preserved, improving calls for special...
In the relentless pursuit of quantum computational advantage, we present a significant advancement with development Zuchongzhi 3.0. This superconducting computer prototype, comprising 105 qubits, achieves high operational fidelities, single-qubit gates, two-qubit and readout fidelity at 99.90%, 99.62%, 99.13%, respectively. Our experiments an 83-qubit, 32-cycle random circuit sampling on 3.0 highlight its superior performance, achieving 1×10^{6} samples in just few hundred seconds. task is...
This article elucidates the critical importance of sustainable land resource management in safeguarding human well-being amid globalization and urbanization, with a particular emphasis on optimal utilization cultivated resources mountainous regions North China. The study focuses within specific village these areas, encompassing open-air cropland, conventional greenhouses, smart greenhouses. Data is sourced from actual plot classifications crop cultivation conditions. A Markov chain model...
The triple-layered ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{3}{\mathrm{O}}_{10}$ is characterized by an unexpectedly strong quasi-two dimensional characteristic, and a sharp metamagnetic transition ferromagnetic behavior occurring within the basal plane along c axis, respectively. interplane resistivity at magnetic field B, up to 32 T, exhibits very low-frequency quantum oscillations associated with spin polarized state when B parallel large magnetoresistivity accompanied critical fluctuations...
Neutral-atom arrays serve as an ideal platform to study quantum simulation and logic gates, where intense efforts have been devoted improving the fidelity of two-qubit gates. We report our recent findings in constructing a different type controlled phase gate protocol with neutral atoms enabled by Rydberg blockade, which aims at both robustness high fidelity. It relies upon modulated driving pulse specially tailored smooth waveform gain appropriate accumulations for The major features...
Within the last decades, neutron reflectometry has been developed into a powerful experimental technique for probing of surface structures and buried interfaces on nanometer length scale [1...
We study the atom-photon quantum interface with intracavity Rydberg-blocked atomic ensemble where ground-Rydberg transition is realized by two-photon transition.Via theoretical analysis, we report our recent findings of Jaynes-Cummings model on optical domain and robust atomphoton gate enabled this platform.The requirement implementation mild which includes an cavity moderately high finesse, typical alkali atoms such as Rb or Cs condition that cold well within Rydberg blockade radius.The...
For neutral atom qubits, the two-qubit gate is typically realized via Rydberg blockade effect, which hints about special status of level besides regular qubit register states. Here, we carry out experimental and theoretical studies to reveal how ground-Rydberg coherence control affects process Controlled-Z ($C_Z$) gate, such as commonly used $\pi$-gap-$\pi$ pulse sequence originally proposed in Phys. Rev. Lett. \textbf{85}, 2208 (2000). We measure decoherence after pulses make a direct...
We demonstrate experimentally the generation of one-dimensional cold gases $^{87}$Rb atoms by diffuse laser cooling (DLC). A horizontal slender vacuum glass tube with length 105~cm and diameter 2~cm is used in our experiment. The light inside tube, which generated multi-reflection injected lasers, cools background vapor atoms. With 250~mW 50~mW repumping light, an evenly distributed meter-long profile atom cloud obtained. observe a factor 4 improvement on atomic OD for typical duration...
Magnetic and dielectric properties have been investigated on BiMn2O5 single crystals. measurements show that becomes antiferromagnetic below TN∼39 K, with short range magnetic correlation existing between TN T∗∼100 K. Three thermally excited relaxations at temperatures TN<T<300 K large intrinsic magnetodielectric effect due to the special arrangement of Mn3+/Mn4+ ions associated electron hopping them were observed. The low temperature anisotropic relaxation...
We prepared a series of Bi1−xLaxFeO3 (0 ≤ x 0.2) ceramics with sol-gel method and find that both the magnetization dielectric constant show an abrupt anomaly near critical field Hc, which is attributed to destruction cycloidal antiferromagnetic spin structure. The Hc decreases substantially from ∼20 T for = 0 sample [Y. F. Popov et al., JETP Lett. 57, 69 (1993)] ∼2.8 0.17 finally 0.2 at room temperature (RT). It also found increases decreasing temperature. variation La substitution can be...