Publications (77)
Simulation of anyonic statistics and its topological path independence using a 7-qubit quantum simulator
Annie Jihyun Park, Emma McKay, Dawei Lu +1
Anyons, quasiparticles living in two-dimensional spaces with exotic exchange statistics, can serve as the fundamental units for fault-tolerant quantum computation. However, experim…
Quantum Spacetime on a Quantum Simulator
Keren Li, Youning Li, Muxin Han +8
We experimentally simulate the spin networks -- a fundamental description of quantum spacetime at the Planck level. We achieve this by simulating quantum tetrahedra and their inter…
MammothModa2: A Unified AR-Diffusion Framework for Multimodal Understanding and Generation
Tao Shen, Xin Wan, Taicai Chen +10
Unified multimodal models aim to integrate understanding and generation within a single framework, yet bridging the gap between discrete semantic reasoning and high-fidelity visual…
MammothModa: Multi-Modal Large Language Model
Qi She, Junwen Pan, Xin Wan +3
In this report, we introduce MammothModa, yet another multi-modal large language model (MLLM) designed to achieve state-of-the-art performance starting from an elementary baseline.…
Quantum Factorization of 143 on a Dipolar-Coupling NMR system
Nanyang Xu, Jing Zhu, Dawei Lu +3
Quantum algorithms could be much faster than classical ones in solving the factoring problem. Adiabatic quantum computation for this is an alternative approach other than Shor's al…
Quantum Pure State Tomography via Variational Hybrid Quantum-Classical Method
Tao Xin, Xinfang Nie, Xiangyu Kong +3
To obtain a complete description of a quantum system, one usually employs standard quantum state tomography, which however requires exponential number of measurements to perform an…
Stable and High-Precision 3D Positioning via Tunable Composite-Dimensional Hong-Ou-Mandel Interference
Yongqiang Li, Hongfeng Liu, Dawei Lu +1
We propose a stable and high-precision three-dimensional (3D) quantum positioning scheme based on Hong-Ou-Mandel interference. While previous studies have explored HOM interference…
Learning Syntactic Dense Embedding with Correlation Graph for Automatic Readability Assessment
Xinying Qiu, Yuan Chen, Hanwu Chen +3
Deep learning models for automatic readability assessment generally discard linguistic features traditionally used in machine learning models for the task. We propose to incorporat…
Optimal experiment design for quantum state tomography
Jun Li, Shilin Huang, Zhihuang Luo +3
Quantum state tomography is an indispensable but costly part of many quantum experiments. Typically, it requires measurements to be carried in a number of different settings on a f…
Reversing Heat Flow by Coherence in a Multipartite Quantum System
Keyi Huang, Qi Zhang, Xiangjing Liu +12
The second law of thermodynamics dictates that heat flows spontaneously from a high-temperature entity to a lower-temperature one. Yet, recent advances have demonstrated that quant…
Practical quantum simulation of small-scale non-Hermitian dynamics
Hongfeng Liu, Xiaodong Yang, Kai Tang +5
Non-Hermitian quantum systems have recently attracted considerable attention due to their exotic properties. Though many experimental realizations of non-Hermitian systems have bee…
Measuring Quantum Entanglement from Local Information by Machine Learning
Yulei Huang, Liangyu Che, Chao Wei +5
Entanglement is a key property in the development of quantum technologies and in the study of quantum many-body simulations. However, entanglement measurement typically requires qu…
Experimental violation of the Leggett-Garg inequality in a 3-level system
Hemant Katiyar, Aharon Brodutch, Dawei Lu +1
The Leggett-Garg (LG) test of macroscopic realism involves a series of dichotomic non-invasive measurements that are used to calculate a function which has a fixed upper bound for…
Noise-Resilient Quantum Metrology with Quantum Computing
Xiangyu Wang, Chenrong Liu, Xue Lin +8
Quantum computing has made remarkable strides in recent years, as demonstrated by quantum supremacy experiments and the realization of high-fidelity, fault-tolerant gates. However,…
Experimental demonstration of quantum causal inference via noninvasive measurements
Hongfeng Liu, Xiangjing Liu, Qian Chen +5
We probe the foundations of causal structure inference experimentally. The causal structure concerns which events influence other events. We probe whether causal structure can be d…
Online optimization for optical readout of a single electron spin in diamond
Xue Lin, Jingwei Fan, Runchuan Ye +4
The nitrogen-vacancy (NV) center in diamond has been developed as a promising platform for quantum sensing, especially for magnetic field measurements in the nano-tesla range with…
Learning Quantum Hamiltonians from Single-qubit Measurements
Liangyu Che, Chao Wei, Yulei Huang +6
It is natural to measure the observables from the Hamiltonian-based quantum dynamics, and its inverse process that Hamiltonians are estimated from the measured data also is a vital…
Measuring Holographic Entanglement Entropy on a Quantum Simulator
Keren Li, Muxin Han, Dongxue Qu +6
Quantum simulation promises to have wide applications in many fields where problems are hard to model with classical computers. Various quantum devices of different platforms have…
Quantum State and Process Tomography via Adaptive Measurements
Hengyan Wang, Wenqiang Zheng, Nengkun Yu +9
We investigate quantum state tomography (QST) for pure states and quantum process tomography (QPT) for unitary channels via measurements. For a quantum system with a …
Experimental Identification of Non-Abelian Topological Orders on a Quantum Simulator
Keren Li, Yidun Wan, Ling-Yan Hung +5
Topological orders can be used as media for topological quantum computing --- a promising quantum computation model due to its invulnerability against local errors. Conversely, a q…
Experimentally superposing two pure states with partial prior knowledge
Keren Li, Guofei Long, Hemant Katiyar +4
Superposition, arguably the most fundamental property of quantum mechanics, lies at the heart of quantum information science. However, how to create the superposition of any two un…
SpinQ Gemini: a desktop quantum computer for education and research
Shi-Yao Hou, Guanru Feng, Zipeng Wu +13
SpinQ Gemini is a commercial desktop quantum computer designed and manufactured by SpinQ Technology. It is an integrated hardware-software system. The first generation product with…
Neural quantum embedding via deterministic quantum computation with one qubit
Hongfeng Liu, Tak Hur, Shitao Zhang +10
Quantum computing is expected to provide exponential speedup in machine learning. However, optimizing the data loading process, commonly referred to as quantum data embedding, to m…
MetaFE-DE: Learning Meta Feature Embedding for Depth Estimation from Monocular Endoscopic Images
Dawei Lu, Deqiang Xiao, Danni Ai +7
Depth estimation from monocular endoscopic images presents significant challenges due to the complexity of endoscopic surgery, such as irregular shapes of human soft tissues, as we…
Realizing Universal Non-Markovian Noise Suppression
Hongfeng Liu, Zizhao Han, Xinfang Nie +2
Non-Markovian noise, arising from environmental memory effects, is the most general and challenging form of noise in quantum computing, and is typically difficult to characterize a…
Noisy intermediate-scale quantum computers
Bin Cheng, Xiu-Hao Deng, Xiu Gu +18
Quantum computers have made extraordinary progress over the past decade, and significant milestones have been achieved along the path of pursuing universal fault-tolerant quantum c…
Velocity Scanning Tomography for Room-Temperature Quantum Simulation
Jiefei Wang, Ruosong Mao, Xingqi Xu +9
Quantum simulation offers an analog approach for exploring exotic quantum phenomena using controllable platforms, typically necessitating ultracold temperatures to maintain the qua…
Direct Readout of Nitrogen-Vacancy Hybrid-Spin Quantum Register in Diamond by Photon Arrival Time Analysis
Jingyan He, Yu Tian, Zhiyi Hu +4
Quantum state readout plays a pivotal role in quantum technologies, spanning applications in sensing, computation, and secure communication. In this work, we introduce a new approa…
Experimental Observation of Equilibrium and Dynamical Quantum Phase Transitions via Out-of-Time-Ordered Correlators
Xinfang Nie, Bo-Bo Wei, Xi Chen +8
The out-of-time-ordered correlators (OTOC) have been established as a fundamental concept for quantifying quantum information scrambling and diagnosing quantum chaotic behavior. Re…
NMR quantum information processing
Dawei Lu, Aharon Brodutch, Jihyun Park +3
Quantum computing exploits fundamentally new models of computation based on quantum mechanical properties instead of classical physics, and it is believed that quantum computers ar…
Experimental realization of quantum Zeno dynamics for robust quantum metrology
Ran Liu, Xiaodong Yang, Xiang Lv +5
Quantum Zeno dynamics (QZD), which restricts the system's evolution to a protected subspace, provides a promising approach for protecting quantum information from noise. Here, we e…
Experimental Realization of Self-Contained Quantum Refrigeration
Keyi Huang, Cheng Xi, Xinyue Long +7
A fundamental challenge in quantum thermodynamics is the exploration of inherent dimensional constraints in thermodynamic machines. In the context of two-level systems, the most co…
Experimental Implementation of Efficient Quantum Pseudorandomness on a 12-spin System
Jun Li, Zhihuang Luo, Tao Xin +5
Quantum pseudorandomness, also known as unitary designs, comprise a powerful resource for quantum computation and quantum engineering. While it is known in theory that pseudorandom…
Experimental realization of a topologically protected Hadamard gate via braiding Fibonacci anyons
Yu-ang Fan, Yingcheng Li, Yuting Hu +9
Topological quantum computation (TQC) is one of the most striking architectures that can realize fault-tolerant quantum computers. In TQC, the logical space and the quantum gates a…
Simulation of chemical reaction dynamics on an NMR quantum computer
Dawei Lu, Nanyang Xu, Ruixue Xu +4
Quantum simulation can beat current classical computers with minimally a few tens of qubits and will likely become the first practical use of a quantum computer. One promising appl…
Gradient-based closed-loop quantum optimal control in a solid-state two-qubit system
Guanru Feng, Franklin H. Cho, Hemant Katiyar +4
Quantum optimal control can play a crucial role to realize a set of universal quantum logic gates with error rates below the threshold required for fault-tolerance. Open-loop quant…
Quantum causal inference via scattering circuits in NMR
Hongfeng Liu, Xiangjing Liu, Qian Chen +5
We report NMR scattering circuit experiments that reveal causal structure. The scattering circuit involves interacting a probe qubit with the system of interest and finally measuri…
Experimental quantum simulation of non-Hermitian dynamical topological states using stochastic Schrödinger equation
Zidong Lin, Lin Zhang, Xinyue Long +8
Noise is ubiquitous in real quantum systems, leading to non-Hermitian quantum dynamics, and may affect the fundamental states of matter. Here we report in experiment a quantum simu…
A Separability-Entanglement Classifier via Machine Learning
Sirui Lu, Shilin Huang, Keren Li +7
The problem of determining whether a given quantum state is entangled lies at the heart of quantum information processing, which is known to be an NP-hard problem in general. Despi…
Self-Consistent Determination of Single-Impurity Anderson Model Using Hybrid Quantum-Classical Approach on a Spin Quantum Simulator
Xinfang Nie, Xuanran Zhu, Yu-ang Fan +9
The accurate determination of the electronic structure of strongly correlated materials using first principle methods is of paramount importance in condensed matter physics, comput…
Estimating the coherence of noise in quantum control of a solid-state qubit
Guanru Feng, Joel J. Wallman, Brandon Buonacorsi +6
To exploit a given physical system for quantum information processing, it is critical to understand the different types of noise affecting quantum control. Distinguishing coherent…
Pulse-width-induced polarization enhancement of optically-pumped N-V electron spin in diamond
Yumeng Song, Yu Tian, Zhiyi Hu +7
The nitrogen-vacancy (N-V) center in diamond is a widely-used platform for quantum information processing and metrology. The electron-spin state of N-V center could be initialized…
Experimental Detection of the Quantum Phases of a Three-Dimensional Topological Insulator on a Spin Quantum Simulator
Tao Xin, Yishan Li, Yu-ang Fan +6
The detection of topological phases of matter becomes a central issue in recent years. Conventionally, the realization of a specific topological phase in condensed matter physics r…
Quantum Simulation of the Non-Fermi-Liquid State of Sachdev-Ye-Kitaev Model
Zhihuang Luo, Yi-Zhuang You, Jun Li +5
The Sachdev-Ye-Kitaev (SYK) model incorporates rich physics, ranging from exotic non-Fermi liquid states without quasiparticle excitations, to holographic duality and quantum chaos…
Implementation of a Quantum-simulation Algorithm of Calculating Molecular Ground-state Energy on an NMR Quantum Computer
Jiangfeng Du, Nanyang Xu, Xinhua Peng +3
It is exponentially hard to simulate quantum systems by classical algorithms, while quantum computer could in principle solve this problem polynomially. We demonstrate such an quan…
NMRCloudQ: A Quantum Cloud Experience on a Nuclear Magnetic Resonance Quantum Computer
Tao Xin, Shilin Huang, Sirui Lu +7
As of today, no one can tell when a universal quantum computer with thousands of logical quantum bits (qubits) will be built. At present, most quantum computer prototypes involve l…
Experimental Realization of a Quantum Refrigerator Driven by Indefinite Causal Orders
Xinfang Nie, Xuanran Zhu, Keyi Huang +11
Indefinite causal order (ICO) is playing a key role in recent quantum technologies. Here, we experimentally study quantum thermodynamics driven by ICO on nuclear spins using the nu…
NMR Experimental Demonstration of Probabilistic Quantum Cloning
Hongwei Chen, Dawei Lu, Bo Chong +4
The method of quantum cloning is divided into two main categories: approximate and probabilistic quantum cloning. The former method is used to approximate an unknown quantum state…
Improved Quantum Computing with the Higher-order Trotter Decomposition
Xiaodong Yang, Xinfang Nie, Yunlan Ji +3
In designing quantum control, it is generally required to simulate the controlled system evolution with a classical computer. However, computing the time evolution operator can be…
Entanglement-Enhanced Quantum Metrology in Colored Noise by Quantum Zeno Effect
Xinyue Long, Wan-Ting He, Na-Na Zhang +9
In open quantum systems, the precision of metrology inevitably suffers from the noise. {In Markovian open quantum dynamics, the precision can not be improved by using entangled pro…
Detecting scrambling via statistical correlations between randomized measurements on an NMR quantum simulator
Xinfang Nie, Ze Zhang, Xiuzhu Zhao +3
Out-of-time-order correlator (OTOC), been suggested as a measure of quantum information scrambling in quantum many-body systems, has received enormous attention recently. The exper…
Quantum Control for Time-dependent Noise by Inverse Geometric Optimization
Xiaodong Yang, Xinfang Nie, Tao Xin +2
Quantum systems are exceedingly difficult to engineer because they are sensitive to various types of noises. In particular, time-dependent noises are frequently encountered in expe…
Certifying Quantum Temporal Correlation via Randomized Measurements: Theory and Experiment
Hongfeng Liu, Zhenhuan Liu, Shu Chen +3
We consider the certification of temporal quantum correlations using the pseudo-density matrix (PDM), an extension of the density matrix to the time domain, where negative eigenval…
Frequency of Rational Fractions on [0, 1]
Zongwei Zhou, Dawei Lu
In this paper, the authors design a trial to count rational ratios on the interval [0, 1], and plot a normalized frequency statistical graph. Patterns, symmetry and co-linear prope…
Solving Quantum Ground-State Problems with Nuclear Magnetic Resonance
Zhaokai Li, Man-Hong Yung, Hongwei Chen +5
Quantum ground-state problems are computationally hard problems; for general many-body Hamiltonians, there is no classical or quantum algorithm known to be able to solve them effic…
Experimental Validation of Enhanced Information Capacity by Quantum Switch in Accordance with Thermodynamic Laws
Cheng Xi, Xiangjing Liu, Hongfeng Liu +6
We experimentally probe the interplay of the quantum switch with the laws of thermodynamics. The quantum switch places two channels in a superposition of orders and may be applied…
Quantum computing: principles and applications
Guanru Feng, Dawei Lu, Jun Li +2
People are witnessing quantum computing revolutions nowadays. Progress in the number of qubits, coherence times and gate fidelities are happening. Although quantum error correction…
Pure State Tomography with Pauli Measurements
Xian Ma, Tyler Jackson, Hui Zhou +10
We examine the problem of finding the minimum number of Pauli measurements needed to uniquely determine an arbitrary -qubit pure state among all quantum states. We show that onl…
Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders
Feifei Zhou, Yu Tian, Yumeng Song +6
Entanglement, as a key resource for modern quantum technologies, is extremely fragile due to the decoherence. Here, we show that a quantum autoencoder, which is trained to compress…
Multiple Classical Noise Mitigation by Multiobjective Robust Quantum Optimal Control
Bowen Shao, Xiaodong Yang, Ran Liu +4
High-quality control is a fundamental requirement for quantum computation, but practically it is often hampered by the presence of various types of noises, which can be static or t…
Enhancing quantum control by bootstrapping a quantum processor of 12 qubits
Dawei Lu, Keren Li, Jun Li +10
Accurate and efficient control of quantum systems is one of the central challenges for quantum information processing. Current state-of-the-art experiments rarely go beyond 10 qubi…
Optimal Bounds on State Transfer Under Quantum Channels with Application to Spin System Engineering
Wenqiang Zheng, Hengyan Wang, Tao Xin +3
Modern applications of quantum control in quantum information science and technology require the precise characterization of quantum states and quantum channels. In particular, hig…
Local-measurement-based quantum state tomography via neural networks
Tao Xin, Sirui Lu, Ningping Cao +5
Quantum state tomography is a daunting challenge of experimental quantum computing even in moderate system size. One way to boost the efficiency of state tomography is via local me…
Pricing Stocks with Trading Volumes
Ben Duan, Yutian Li, Dawei Lu +2
The present paper proposes a new framework for describing the stock price dynamics. In the traditional geometric Brownian motion model and its variants, volatility plays a vital ro…
Experimental Virtual Quantum Broadcasting
Yuxuan Zheng, Xinfang Nie, Hongfeng Liu +3
The quantum no-broadcasting theorem states that it is fundamentally impossible to perfectly replicate an arbitrary quantum state, even if correlations between the copies are allowe…
A Quantum Algorithm for Solving Linear Differential Equations: Theory and Experiment
Tao Xin, Shijie Wei, Jianlian Cui +7
We present and experimentally realize a quantum algorithm for efficiently solving the following problem: given an matrix , an -dimensional vector $\text…
Experimental realization of post-selected weak measurements on an NMR quantum processor
Dawei Lu, Aharon Brodutch, Jun Li +2
The ability to post-select the outcomes of an experiment is a useful theoretical concept and experimental tool. In the context of weak measurements post-selection can lead to surpr…
Observation of a symmetry-protected topological phase in external magnetic fields
Zhihuang Luo, Wenzhao Zhang, Xinfang Nie +1
Topological phases have greatly improved our understanding of modern conception of phases of matter that go beyond the paradigm of symmetry breaking and are not described by local…
Dynamical-Invariant-based Holonomic Quantum Gates: Theory and Experiment
Yingcheng Li, Tao Xin, Chudan Qiu +5
Among existing approaches to holonomic quantum computing, the adiabatic holonomic quantum gates (HQGs) suffer errors due to decoherence, while the non-adiabatic HQGs either require…
Approximation of Reachable Set for Coherently Controlled Open Quantum Systems: Application to Quantum State Engineering
Jun Li, Dawei Lu, Zhihuang Luo +3
Precisely characterizing and controlling realistic open quantum systems is one of the most challenging and exciting frontiers in quantum sciences and technologies. In this Letter,…
Strain Enhanced Spin Readout Contrast in Silicon Carbide Membranes
Haibo Hu, Guodong Bian, Ailun Yi +12
Quantum defects in solids have emerged as a transformative platform for advancing quantum technologies. A key requirement for these applications is achieving high-fidelity single-s…
Quantum state tomography via reduced density matrices
Tao Xin, Dawei Lu, Joel Klassen +7
Quantum state tomography via local measurements is an efficient tool for characterizing quantum states. However it requires that the original global state be uniquely determined (U…
Experimental observation of dynamical bulk-surface correspondence for topological phases
Ya Wang, Wentao Ji, Zihua Chai +12
We experimentally demonstrate a dynamical classification approach for investigation of topological quantum phases using a solid-state spin system through nitrogen-vacancy (NV) cent…
Experimental Estimation of Average Fidelity of a Clifford Gate on a 7-qubit Quantum Processor
Dawei Lu, Hang Li, Denis-Alexandre Trottier +8
Quantum gates in experiment are inherently prone to errors that need to be characterized before they can be corrected. Full characterization via quantum process tomography is impra…
Recovering optimal precision in quantum sensing with time domain imperfections
Zi-Shen Li, Xinyue Long, Xiaodong Yang +2
Quantum control plays a crucial role in enhancing precision scaling for quantum sensing. However, most existing protocols require perfect control, even though real-world devices in…
Control-enhanced quantum metrology under Markovian noise
Yue Zhai, Xiaodong Yang, Kai Tang +5
Quantum metrology is supposed to significantly improve the precision of parameter estimation by utilizing suitable quantum resources. However, the predicted precision can be severe…
Tomography is necessary for universal entanglement detection with single-copy observables
Dawei Lu, Tao Xin, Nengkun Yu +7
Entanglement, one of the central mysteries of quantum mechanics, plays an essential role in numerous applications of quantum information theory. A natural question of both theoreti…