A5015735666- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Quantum optics and atomic interactions
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Quantum Information and Cryptography
- Integrated Circuits and Semiconductor Failure Analysis
- Silicon Nanostructures and Photoluminescence
- Quantum-Dot Cellular Automata
University of Science and Technology of China
2023-2025
Quantum (Australia)
2025
CAS Key Laboratory of Urban Pollutant Conversion
2023
In our toolbox of quantum gates for spin qubits, the SWAP-family based on Heisenberg exchange coupling are quite versatile: SWAP gate can help solve connectivity problem by realizing both short- and long-range state transfer, while is a basic two-qubit entangling gate. Here we demonstrate in double dot isotopically enriched silicon presence micromagnet. We achieve two-orders-of-magnitude adjustable ratio between J Zeeman energy difference ΔEz, overcoming major obstacle high-fidelity also...
Preserving qubit coherence and maintaining high-fidelity control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate addressable fault-tolerant single spin with average fidelity of 99.12% via randomized benchmarking on a silicon dot device integrated micromagnet. Its dephasing time ${T}_{2}^{\ensuremath{\ast}}$ $1.025\phantom{\rule{0.2em}{0ex}}\text{\ensuremath{\mu}}\mathrm{s}$, can be enlarged to...
Spin qubits based on silicon metal-oxide semiconductor (Si-MOS) quantum dots (QDs) are promising platforms for large-scale computers. To control spin in QDs, electric dipole resonance (EDSR) has been most commonly used recent years. By delocalizing an electron across a double charge state, “flopping-mode” EDSR realized Si/SiGe QDs. Here, we demonstrate flopping-mode qubit Si-MOS QD via Elzerman single-shot readout. When changing the detuning with fixed drive power, achieve s-shape...
Abstract Synthesized spin-orbit coupling (SSOC) is crucial for the operation of spin qubits in silicon quantum dot, as it address challenge posed by inherently weak intrinsic (ISOC) silicon. Here, we investigate anisotropic properties single qubit metal-oxide-semiconductor (Si-MOS) dot and provide experimental evidence control SSOC. Additionally, experimentally demonstrate that tuning operating point away from conventional configuration can enhance quality factor qubit. These findings lay a...
Abstract Radio frequency (RF) reflectometry is an effective and sensitive technique for detecting charge signal in semiconductor quantum dots, its measurement bandwidth can reach the MHz level. However, accumulation mode devices, presence of parasitic capacitance makes RF more difficult. The universal approach relocating ion implantation region approximately 10 μm from center Single-Electron Transistor (SET) optimizing design gates. But, this method puts forward stringent requirements...
Abstract In semiconductor quantum dot systems, pulse distortion is a significant source of coherent errors, which impedes qubit characterization and control. Here, we demonstrate two calibration methods using two-qubit system as detector to correct calibrate the transfer function control line. Both are straightforward implement, robust against noise, applicable wide range types. The differ in correction accuracy complexity. first, Coarse Predistortion (CPD) method, partially mitigates...
To realize large-scale quantum information processes, an ideal scheme for two-qubit operations should enable diverse with given hardware and physical interaction. However, spin qubits in semiconductor dots, the common operations, including CPhase gates, SWAP CROT are realized distinct parameter regions control waveforms, posing challenges their simultaneous implementation. Here, taking advantage of inherent Heisenberg interaction between qubits, we propose verify a fast composite gate to...
Pulse distortion, as one of the coherent error sources, hinders characterization and control qubits. In semiconductor quantum dot system, distortions on measurement pulses disturb experimental results, while no effective calibration procedure has yet been reported. Here, we demonstrate two different methods to calibrate correct distortion using two-qubit system a detector. The have correction accuracy complexity. One is coarse predistortion (CPD) method, with which partly relieved. other...
Preserving qubit coherence and maintaining high-fidelity control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate addressable fault-tolerant single spin with average fidelity of 99.12% via randomized benchmarking on a silicon dot device integrated micromagnet. Its dephasing time T2* 1.025 us can be enlarged to 264 by using the Hahn echo technique, reflecting strong low-frequency in our system. To break through limitation, introduce...
With one- and two-qubit gate fidelities approaching the fault-tolerance threshold for spin qubits in silicon, how to scale up architecture make large arrays of become more pressing challenges. In a scaled-up structure, qubit-to-qubit connectivity has crucial impact on counts quantum error correction general algorithms. our toolbox gates qubits, SWAP is quite versatile: it can help solve problem by realizing both short- long-range state transfer, act as basic gate, which reduce circuit depth...
Spin qubits based on silicon metal-oxide semiconductor (Si-MOS) quantum dots (QDs) are promising platforms for large-scale computers. To control spin in QDs, electric dipole resonance (EDSR) has been most commonly used recent years. By delocalizing an electron across a double charge state, flopping-mode EDSR realized Si/SiGe QDs. Here, we demonstrate qubit Si-MOS QD via Elzerman single-shot readout. When changing the detuning with fixed drive power, achieve s-shape frequencies, order of...