Thematic Center for Quantum Computer
Introduction
A universal quantum computer promises a sustainable ecosystem, fostering advancements in artificial intelligence, drug discovery, exotic materials, and beyond. Enhancing qubit gate fidelity stands as the linchpin for realizing such a quantum computer, particularly for noisy intermediate-scale quantum applications and as a pivotal step towards error-corrected quantum systems. The architecture of two-qubit coupling assumes a central role, facilitating single-qubit operations and the creation of two-qubit entanglement. Improving two-qubit gate fidelity and minimizing crosstalk are essential for scaling up qubits towards fault-tolerant quantum computers. Our endeavor is to develop a high-performance superconducting quantum computer with exceptional two-qubit fidelity. To achieve this, we propose three tasks: standardizing the fabrication process, optimizing device design, and implementing efficient operation schemes.
We will adopt a frequency-tunable coupler to leverage high coupling strength and nullify direct coupling between qubits, resulting in high on-off-contrast interqubit coupling—an imperative for swift and precise two-qubit gates. To expedite qubit reset times, we will explore active qubit reset schemes utilizing fast FPGA architecture for pulse-level feedback. Various gate optimization and autocalibration schemes will be devised and implemented for high performance multiqubit systems. These endeavors pave the way for establishing the foundation of a scalable superconducting quantum computer.
Laboratory contact number:02-2789-8372
Jointly Appointed Researcher
| Name | Affiliation |
| Ke, Chung-Ting | Academia Sinica, Institute of Physics & Research Center for Critical Issues |
| Kuo, Watson | National Chung Hsing University, Department of Physics |
| Wu, Cen-Shawn | National Changhua University of Education, Department of Physics |
| Chen, Yung-Fu | National Central University, Department of Physics |
Major Milestones of the Project
- Succeeded in delivering Academia Sinica’s in-house developed 5Q superconducting quantum computer with an average T1 of 28 us.
- Single qubit fidelity achieves 99.7%, enabling the implementation of 2Q SWAP and CZ gates, as well as CZ gate operations in 5Q system.
- Achieved characterization of 3Q GHZ state, and demonstrated 4Q and 5Q entanglement states.
- Academia Sinica’s in-house 5Q system is now online on the cloud platform for demonstration.
