A5008696845- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Quantum many-body systems
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Quantum optics and atomic interactions
- Topological Materials and Phenomena
- Advanced Frequency and Time Standards
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor materials and devices
- Robotic Mechanisms and Dynamics
- Surface and Thin Film Phenomena
- Photonic and Optical Devices
- Optical Network Technologies
- Quantum chaos and dynamical systems
- Quantum Mechanics and Applications
- Advanced Numerical Analysis Techniques
- Spectroscopy and Quantum Chemical Studies
- Advanced Surface Polishing Techniques
- Advanced Memory and Neural Computing
Southern University of Science and Technology
2021-2025
Beijing Academy of Quantum Information Sciences
2022-2025
Quantum (Australia)
2024
Nanjing University
2019-2021
Collaborative Innovation Center of Advanced Microstructures
2019-2021
High-quality two-qubit gate operations are crucial for scalable quantum information processing. Often, the fidelity is compromised when system becomes more integrated. Therefore, a low-error-rate, easy-to-scale scheme highly desirable. Here, we experimentally demonstrate new that exploits fixed-frequency qubits and tunable coupler in superconducting circuit. The requires less control lines, reduces crosstalk effect, simplifies calibration procedures, yet produces controlled-Z 30ns with high...
Quantum batteries are miniature energy storage devices and play a very important role in quantum thermodynamics. In recent years, have been extensively studied, but limited theoretical level. Here we report the experimental realization of battery based on superconducting qubits. Our model explores dark bright states to achieve stable powerful charging processes, respectively. scheme makes use adiabatic brachistochrone, which allows us speed up {battery ergotropy injection. Due inherent...
A Berry curvature is an imaginary component of the quantum geometric tensor (QGT) and well studied in many branches modern physics; however, metric as a real QGT less explored. Here, by using tunable superconducting circuits, we experimentally demonstrate two methods to directly measure for characterizing geometry topology underlying states parameter space. The first method probe transition probability after sudden quench, second one detect excitation rate under weak periodic driving....
For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has crucial impact to two-qubit gate fidelity. Two-qubit gates fidelity meeting the criterion fault-tolerant computationhave been demonstrated using interaction. However, as performance processors improves, static-ZZ can become performance-limiting factor for operation and error correction. Here, we introduce architecture qubits opposite-sign anharmonicity, transmon...
Gate-based quantum computation has been extensively investigated using circuits based on qubits. In many cases, such qubits are actually made out of multilevel systems but with only two states being used for computational purpose. While a strategy the advantage in line common binary logic, it some sense wastes ready-for-use resources large Hilbert space these intrinsic multidimensional systems. Quantum beyond (e.g., qutrits or qudits) thus discussed and argued to be more efficient than its...
Abstract Implementing quantum algorithms on realistic devices requires translating high-level global operations into sequences of hardware-native logic gates, a process known as compiling. Physical limitations, such constraints in connectivity and gate alphabets, often result unacceptable implementation costs. To enable successful near-term applications, it is crucial to optimize compilation by exploiting the capabilities existing hardware. Here we implement resource-efficient construction...
Unwanted $ZZ$ interaction is a quantum-mechanical crosstalk phenomenon which correlates qubit dynamics and ubiquitous in superconducting systems. It adversely affects the quality of quantum operations can be detrimental scalable information processing. Here we propose experimentally demonstrate practically extensible approach for complete cancellation residual between fixed-frequency transmon qubits, are known long coherence simple control. We apply to intermediate coupler that connects...
Scalable quantum information processing requires that modular gate operations can be executed in parallel. The presence of crosstalk decreases the individual addressability, causing erroneous results during simultaneous operations. For superconducting qubits which operate microwave regime, electromagnetic isolation is often limited due to design constraints, leading signal deteriorate quality Here, we propose and demonstrate a method based on AC Stark effect for calibrating crosstalk....
Anyons, exotic quasiparticles in two-dimensional space exhibiting nontrivial exchange statistics, play a crucial role universal topological quantum computing. One notable proposal to manifest the fractional statistics of anyons is toric code model; however, scaling up its size through simulation poses serious challenge because highly entangled ground state. In this Letter, we demonstrate that modular superconducting processor enables hardware-pragmatic implementation model. Through...
As quantum circuits become more integrated and complex, additional error sources that were previously insignificant start to emerge. Consequently, the fidelity of gates benchmarked under pristine conditions falls short predicting their performance in realistic circuits. To overcome this problem, we must improve robustness against pertinent models besides isolated fidelity. Here, report experimental realization robust superconducting based on a geometric framework for diagnosing correcting...
Superconducting qubits are a promising platform for building fault-tolerant quantum computers, with recent achievement showing the suppression of logical error increasing code size. However, leakage into noncomputational states, common issue in practical systems including superconducting circuits, introduces correlated errors that undermine correction (QEC) scalability. Here, we propose and demonstrate reduction scheme utilizing tunable couplers, widely adopted ingredient large-scale...
Quantum Approximate Optimization Algorithm (QAOA) is a promising candidate for achieving quantum advantage in combinatorial optimization. However, its variational framework presents long-standing challenge selecting circuit parameters. In this work, we prove that the energy expectation produced by QAOA can be expressed as trigonometric function of final-level mixer parameter. Leveraging insight, introduce Penta-O, level-wise parameter-setting strategy eliminates classical outer loop,...
Fock-state lattices, composed of photon number states with infinite Hilbert space, have emerged as a promising platform for simulating high-dimensional physics due to their potential extend into arbitrarily high dimensions. Here, we demonstrate the construction multidimensional lattices using superconducting quantum circuits. By controlling artificial gauge fields within internal structures, investigate flux-induced extreme localization dynamics, such Aharonov-Bohm caging, extending from 2D...
Energy spectroscopy is a powerful tool with diverse applications across various disciplines. Variational quantum-classical algorithms based on programmable digital quantum simulators have emerged as promising approaches for conducting models using single device, despite facing significant and classical resource overheads. Here, we experimentally demonstrate multilevel variational fundamental many-body Hamiltonians superconducting simulator. By exploiting symmetries the subspace search...
Fast, robust two-qubit gate operation with low susceptibility to crosstalk are the key scalable quantum-information processing. A parametrically driven is inherently insensitive crosstalk, while superadiabatic control can speed up without losing accuracy. We propose and experimentally implement gates using parametric modulation on superconducting quantum circuits. Our results demonstrate preservation of adiabaticity at a close limit, in addition robustness against instability. controlled-$Z$...
Abstract As superconducting quantum computing continues to advance at an unprecedented pace, there is a compelling demand for the innovation of specialized electronic instruments that act as crucial conduits between processors and host computers. Here, we introduce Microwave Measurement Control System (M 2 CS) dedicated large-scale processors. M CS features compact modular design balances overall performance, scalability flexibility. Electronic tests show key metrics comparable commercial...
Controlling the flow of quantum information is a fundamental task for computers, which unfeasible to realize on classical devices. Coherent devices, can process states are thus required route that encode information. In this paper we demonstrate experimentally smallest transistor with superconducting processor, composed collector qubit, an emitter and coupler (transistor gate). The interaction strength between qubits controlled by frequency state coupler, effectively implementing switch....
Based on the geometrical nature of quantum phases, non-adiabatic holonomic control (NHQC) has become a standard technique for enhancing robustness in constructing gates. However, conventional approach NHQC is sensitive to instability, as it requires driving pulses cover fixed pulse area. Furthermore, even small-angle rotations, all operations need be completed with same duration time. Here we experimentally demonstrate time-optimal and unconventional (called TOUNHQC), which can optimize...
Scalable quantum information processing requires the ability to tune multiqubit interactions. This makes precise manipulation of states particularly difficult for interactions because tunability unavoidably introduces sensitivity fluctuations in tuning parameters, leading erroneous gate operations. The performance algorithms may be severely compromised by coherent errors. It is therefore imperative understand how these affect and, more importantly, mitigate their influence. In this study, we...
Coherent quantum state transfer is a vital step in information processing. Based on the stimulated Raman adiabatic passage (STIRAP), we realize robust between two superconducting qubits, mediated by tunable coupler. Utilizing parametric coupling techniques, construct STIRAP Hamiltonian modulating coupler frequency. A population fidelity of 95.1 (±2.0)% achieved and consistent with numerical simulation result 95.4%. By preparing initial maximal superposition one qubit, research how phase...
Mixers play a crucial role in superconducting quantum computing, primarily by facilitating frequency conversion of signals to enable precise control and readout states. However, imperfections, particularly local oscillator leakage unwanted sideband signal, can significantly compromise fidelity. To mitigate these defects, regular mixer calibrations are indispensable, yet they pose formidable challenge large-scale control. Here, we introduce an situ scalable calibration scheme using qubits....
We propose and demonstrate experimentally the arbitrary state-transfer in a qubit by using superadiabatic approach superconducting circuit. encode time-dependent dark state generated an applied microwave field, speeding up adiabatic evolution transitionless quantum driving algorithms. This is realized qutrit system, which consists of ancillary level. Furthermore, we analyze robustness implementation measure fidelity transfer operation randomized benchmarking technique.
In quantum information processing, it is necessary to transfer state between different systems. Herein, a scheme using multi‐passage Landau–Zener–Stückelberg interferometry in three superconducting qubits proposed. A periodic triangle waveform quickly drives the system across energy level anticrossing multiple times, inducing multiphoton Rabi oscillations. Using 0‐photon oscillations, dynamical with probability close 100% realized. The fidelity of insensitive local distortion driving...