2025/10/01(Wed) 10:30 -12:00 五樓第一會議室 5F, 1st Meeting Room
Title
Layering Quantum Innovation: From van der Waals Materials to Quantum Technology
Speaker
王怡然研究員 (Massachusetts Institute of Technology, USA) Dr. Joel Î-jiân Wang (Massachusetts Institute of Technology, USA)Abstract
Over the past two decades, superconducting quantum technology has seen remarkable progress—from a six-order-of-magnitude enhancement in qubit coherence times to cQED-based multi-qubit architectures and the first demonstrations of quantum supremacy. These advances, along with emerging applications in the noisy intermediate-scale quantum (NISQ) era, highlight the rapid evolution of the field.
Achieving scalable, fault-tolerant quantum computing demands a deep synergy between material science, device fabrication, electrical engineering, and fundamental physics. In this context, van der Waals (vdW) materials—spanning semimetals, insulators, semiconductors, ferromagnets, superconductors, and topological insulators—offer a compelling platform for next-generation quantum devices. The ability to assemble vdW heterostructures with atomic precision opens new opportunities for integrating these materials into superconducting circuits, enhancing qubit control, reducing device footprints, and suppressing unwanted couplings. Conversely, superconducting quantum circuits and cQED techniques provide a powerful toolset for probing quantum materials, offering complementary insights to those obtained from conventional transport measurements.
In this talk, I will discuss the integration of vdW materials into superconducting quantum circuits and their transformative potential for quantum technologies. I will highlight our recent studies on the kinetic inductance of 2D superconductors, including magic-angle twisted bilayer graphene (MATBG) and NbSe₂. Leveraging cQED techniques, we have uncovered key insights into pairing symmetry and the role of quantum geometry in flat-band superconductors. We have also demonstrated vdW superconductors in the clean limit with record-high sheet kinetic inductance, positioning them as promising building blocks for high-coherence, compact quantum circuits. I will also share our latest results on all-vdW, merged-element transmon qubits, which achieve coherence times of up to 100 microseconds, and conclude with a forward-looking perspective on the path toward wafer-scale, vdW-based quantum circuits.
[1] J. Î-j. Wang et al., Nature Nanotechnology 14,120-125 (2019)
[2] J. Î-j. Wang et al., Nature Materials 21, 398–403(2022)
[3] M. Tanaka and J. Î-j. Wang et al., Nature 638, 99-105 (2025)
Language
演講語言 (Language): in English