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Generating, witnessing and certifying non-Gaussian states of optical time-frequency modes
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主讲人: Prof. Nicolas Treps,Sorbonne Université
地点: 物理楼 中215
时间: 2023年8月24日 (星期四) 10:00-11:00
主持 联系人: 何琼毅(Tel: 62759367)
主讲人简介: Nicolas Treps is a full professor at Sorbonne Université, laboratoire Kastler Brossel, leading the multimode quantum optics group. He is also in charge of the bachelor of physics program at Sorbonne Université and co-director of the Quantum Information Center Sorbonne. His research is now focused on quantum metrology and quantum information with optical frequency combs. He co-authored 2 books, over 130 refereed publications and 6 patents.

Certifying reliable sources for quantum information processing is still one of the major challenges towards practical applications. Optical approaches to quantum information processing are being one of the most promising platform, thanks in particular to the ability to generate very efficiently large entangled states- cluster states. However, there are still many fundamental challenges, in particular on how to generate, measure and certify the class of states necessary for quantum advantage. We have developed a platform based on optical time-frequency modes, that we use to multiplex continuous variable quantum information. We use mode selective single photon operation in order to produce multimode non-gaussian states, the key ingredient of continuous variable approach to quantum processing. However, the complexity of these states does not allow for an efficient full tomography. Hence on the one hand we developed tools to characterized and certify specific quantum properties, such as Quantum Non-Gaussianity and Wigner negativity. On the other hand we propose a witness based on steering and Fisher information, to witness purely quantum non-gaussian correlations.