Hoạt động khoa học
Seminar
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Seminar Trung tâm Vật lý quốc tế: | |
| Tên báo cáo | Industry-ready spin–photon interfaces for hybrid photonic quantum computing |
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| Người trình bày | Dr. Au Thi Huong |
| Cơ quan | Quandela |
| Ngày | Thứ Bảy, 01-08-2026 |
| Giờ | 10:00 AM |
| Địa điểm | Phòng 315, Viện Vật lý, số 10 Đào Tấn, Giảng Võ, Hà Nội |
| Tóm tắt | Hybrid photonic quantum computers, combining stationary matter qubits and flying photonic qubits, offer an intrinsically networked and resource-efficient route to large-scale, error-corrected quantum computation. Their core components are cavity-coupled matter qubits that act as light–matter interfaces, enabling: high-efficiency on-demand single-photon generation, stable near-unity photon indistinguish ability and spin–multi-photon entanglement. Semiconductor quantum dots in microcavities are a leading platform for realizing such devices. Yet reaching the performance, reproducibility and spin-coherence thresholds for large-scale error correction remains a major challenge requiring industrial fabrication and control. Here we report thousands of monolithic semiconductor quantum-dot devices fabricated using a III–V pilot production line process compatible with large-scale deployment. Systematic control of source parameters yields state of the art efficiency and supports a path to optical losses below fault-tolerance thresholds. Using field quadrature state reconstruction as a stringent joint test of efficiency and indistinguish ability, we observe near unity photon quantum purity stable over tens of minutes and a record single photon Wigner-function negativity. We further demonstrate seven-partite spin–multi-photon entanglement and spin coherence extendable to microsecond timescales in the low magnetic field regime. Finally, photons from distant sources are as indistinguishable as photons emitted successively by a single source. These results establish foundry compatible III–V quantum dots as a scalable platform for hybrid photonic quantum computing. |
| Người chủ trì | Đinh Văn Trung |