报告时间：8月14日 周二 上午10:00
报告人：孙远 研究员 （国防科大）
报告题目： Recent developments in designing atom-photon gate by utilizing intracavity Rydberg blockade
Designing robust atom-photon quantum controlled-PHASE gate is a primary mission in the research of quantum technologies. Within this research area, neutral atoms and especially laser-cooled atoms, serve as one critical platform due to its many distinguished advantages, including the long coherence time, the compatibility with modern laser and electro-optical hardware, the inherent scalability and the availability of coupling to photons at visible to ir wavelengths. It is already well-known that neutral atoms are nice candidates for matter qubit registers with fascinating quantum information processing functionalities. In particular, when combined with cQED techniques, the neutral atom platform is capable of providing strong atom-photon coupling such that entanglement and controlled-PHASE gate between matter qubits and photonic qubits are attainable. While the Rydberg blockade effect is widely regarded to hold promising future in this arena, intensive experimental efforts have revealed that quite a few compelling challenges are yet awaiting to be tackled. Acknowledging the presence of those conceptual and technical difficulties, recently we have seen solid progress in the design and analysis of ultra-high fidelity atom-photon and atom-atom quantum gates, relying upon EIT or adiabatic passage. In this presentation, I'd like to offer a thorough introduction of these new developments in the gate design research frontier, where the focus is to be put on the trio of EIT, adiabatic passage and Autler-Townes effect's roles in controlled-PHASE gates via Rydberg blockade for neutral atom platform. Moreover, under this unified theme, I am going to present some new results towards constructing more experiment-friendly gate protocols.