A5037616939- Statistical Methods and Inference
- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Advanced Statistical Methods and Models
- Financial Risk and Volatility Modeling
- Statistical Methods and Bayesian Inference
- Quantum many-body systems
- Statistical Distribution Estimation and Applications
- Antenna Design and Analysis
- Spectroscopy and Chemometric Analyses
- Neural Networks and Reservoir Computing
- Bayesian Methods and Mixture Models
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Advanced Thermodynamics and Statistical Mechanics
- Statistical and numerical algorithms
- Advanced Statistical Process Monitoring
- Monetary Policy and Economic Impact
- Fault Detection and Control Systems
- Metamaterials and Metasurfaces Applications
- Stochastic processes and financial applications
- Spatial and Panel Data Analysis
- Geochemistry and Geologic Mapping
- Metabolomics and Mass Spectrometry Studies
Hefei National Center for Physical Sciences at Nanoscale
2021-2024
University of Science and Technology of China
2021-2024
Renmin University of China
2015-2024
Microscale (United States)
2024
Beijing Academy of Quantum Information Sciences
2021-2023
PLA Academy of Military Science
2021
CAS Key Laboratory of Urban Pollutant Conversion
2021
Leibniz Institute of Photonic Technology
2019
Helmholtz Institute Jena
2019
Chinese Academy of Sciences
2008-2013
Scaling up to a large number of qubits with high-precision control is essential in the demonstrations quantum computational advantage exponentially outpace classical hardware and algorithmic improvements. Here, we develop two-dimensional programmable superconducting processor, Zuchongzhi, which composed 66 functional tunable coupling architecture. To characterize performance whole system, perform random circuits sampling for benchmarking, system size 56 20 cycles. The cost simulation this...
Simulating quantum walkers Quantum walks are the mechanical analogs of classical random walks, describing propagation a walker across lattice, and find application in developing algorithms for simulating many-body systems. Gong et al. used an 8-by-8 two-dimensional (2D) superconducting qubit square lattice containing 62 functional qubits to show how multiple (two) traverse 2D array, interfering as they go. The authors were also able program paths that follow, demonstrating Mach-Zehnder...
Summary Variance estimation is a fundamental problem in statistical modelling. In ultrahigh dimensional linear regression where the dimensionality much larger than sample size, traditional variance techniques are not applicable. Recent advances variable selection make this accessible. One of major problems high spurious correlation between unobserved realized noise and some predictors. As result, noises actually predicted when extra irrelevant variables selected, leading to serious...
Quantum error correction is a critical technique for transitioning from noisy intermediate-scale quantum (NISQ) devices to fully fledged computers. The surface code, which has high threshold rate, the leading code two-dimensional grid architecture. So far, repeated capability of not been realized experimentally. Here, we experimentally implement an error-correcting distance-3 consists 17 qubits, on \textit{Zuchongzhi} 2.1 superconducting processor. By executing several consecutive cycles,...
Abstract Reconfigurable metasurfaces have attracted much attention in recent years due to their flexible capabilities of manipulating electromagnetic (EM) waves. However, most the existing reconfigurable can only modulate either phase or magnitude, severely limiting scope applications. Here, a novel metasurface is proposed that simultaneously realize dynamic manipulation reflection magnitude and phase. Such composed periodic array single‐layer metallic structure loaded with two kinds PIN...
Understanding various phenomena in nonequilibrium dynamics of closed quantum many-body systems, such as thermalization, information scrambling, and nonergodic dynamics, is crucial for modern physics. Using a ladder-type superconducting processor, we perform analog simulations both the XX-ladder model one-dimensional XX model. By measuring local observables, entanglement entropy, tripartite mutual information, signal thermalization scrambling ladder. In contrast, show that chain, free...
Multiplicative regression model or accelerated failure time model, which becomes linear after logarithmic transformation, is useful in analyzing data with positive responses, such as stock prices life times, that are particularly common economic/financial biomedical studies. Least squares least absolute deviation among the most widely used criterions statistical estimation for model. However, many practical applications, especially treating, example, price data, size of relative error,...
Graphical models have attracted increasing attention in recent years, especially settings involving high-dimensional data. In particular, Gaussian graphical are used to model the conditional dependence structure among multiple random variables. As a result of its computational efficiency, lasso (glasso) has become one most popular approaches for fitting models. this paper, we extend concept p functions. setting, not only is large, but each function itself object, posing an additional level...
We consider a class of vector autoregressive models with banded coefficient matrices. This setting represents type sparse structure for high-dimensional time series, although the implied auto-covariance matrices are not banded. The is also practically meaningful when component series ordered appropriately. establish convergence rates estimated propose Bayesian information criterion determining width bands in matrices, which proved to be consistent. By exploring some approximate structures...
We experimentally study the ergodic dynamics of a 1D array 12 superconducting qubits with transverse field, and identify regimes strong weak thermalization different initial states. observe convergence local observable to its thermal expectation value in strong-thermalizaion regime. For thermalization, exhibits an oscillation around value, which can only be attained by time average. also demonstrate that entanglement entropy concurrence characterize thermalization. Our work provides...
Summary We consider estimating a functional graphical model from multivariate observations. In data analysis, the classical assumption is that each function has been measured over densely sampled grid. However, in practice functions have often observed, with measurement error, at relatively small number of points. propose class doubly models to capture evolving conditional dependence relationship among large sparsely or functions. Our approach first implements nonparametric smoother perform...
In multi-band shared-aperture base station antennas, cross-band mutual couplings always lead to unwanted radiation characteristics. this article, the influence of coupling is investigated from point view induced currents and their secondary fields. A low-band (L-band, 0.76–0.88 GHz) cascade comb dipole antenna proposed passively cancel current therefore suppress field. Owing passive cancellation capability, L-band does not affect performance middle-band (M-band, 1.9–2.7 high-band (H-band,...
Multivariate failure time data arise when each study subject may experience several types of event or there are clusterings observational units such that times within the same cluster correlated. The often to interval grouping have truly discrete measurements. In this paper, marginal distribution for variable is formulated by a grouped-data version proportional hazards model while dependence structure unspecified. Generalized estimating equations in spirit Liang and Zeger (1986, Biometrika...
Periodically driven systems, or Floquet exhibit many novel dynamics and interesting out-of-equilibrium phases of matter. Those arising with the quantum systems' symmetries, such as global U(1) symmetry, can even show dynamical stability symmetry protection. Here we experimentally demonstrate a symmetry-protected prethermal phase, via performing digital-analog simulation on superconducting processor. The this phase is revealed by its robustness against external perturbations. We also find...
Fault-tolerant quantum computing based on surface code has emerged as an attractive candidate for practical large-scale computers to achieve robust noise resistance. To universality, magic states preparation is a commonly approach introducing non-Clifford gates. Here, we present hardware-efficient and scalable protocol arbitrary logical state the rotated code, further experimentally implement it Zuchongzhi 2.1 superconducting processor. An average of 0.8983±0.0002 fidelity at different with...
As an alternative to the local partial likelihood method of Tibshirani and Hastie Fan, Gijbels, King, a global is proposed estimate covariate effect in nonparametric proportional hazards model, λ(t|x)=exp{ψ(x)}λ0(t) . The estimator, ψˆ(x), reduces Cox estimator if discrete. shown be consistent semiparametrically efficient for linear functionals ψ(x) Moreover, Breslow-type estimation cumulative baseline hazard function, using ψˆ(x) , proved efficient. asymptotic bias variance are derived...
High-fidelity two-qubit gates are essential for the realization of large-scale quantum computation and simulation. Tunable coupler design is used to reduce problem parasitic coupling frequency crowding in many-qubit systems thus thought be advantageous. Here we an extensible 5-qubit system which center transmon qubit can couple every four near-neighboring qubits via a capacitive tunable experimentally demonstrate high-fidelity controlled-phase (CZ) gate by manipulating central one qubit....
Entering the era of post-quantum supremacy has given one ability to precisely control noisy intermediate-scale quantum (NISQ) processors with multiqubits and extract valuable many-body correlation resources for many distinct applications. We here construct thermalized states on a 62-qubit superconducting processor use them demonstrate principle Maxwell's demon. further direct effect caused by demon charging process battery (QB). depicted nonequilibrium transportation in our QB through...
Shaojun Guoa, John Leigh Boxb & Wenyang Zhangb*a Institute of Statistics and Big Data, Renmin University China, Beijing, Chinab Department Mathematics, York, United Kingdom