Scientific Activities
Seminars
|
Seminar of International Centre of Physics: | |
| Title | Industry-ready spin–photon interfaces for hybrid photonic quantum computing |
|---|---|
| Speaker | Dr. Au Thi Huong |
| Affiliation | Quandela |
| Date | Saturday, 01-08-2026 |
| Time | 10:00 AM |
| Location | Room 315, 10 Dao Tan, Giang Vo, Ha Noi |
| Abstract | 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. |
| Host person | Đinh Văn Trung |