Abstract
Driven by the initial curiosity in Bell’s inequality, the last few decades have witnessed tremendous progress in the coherent control of individual quantum systems, which has subsequently led to a gradual transition from the fundamental physics to potential practical technologies. Today, there have been already some quantum communication networks constructed that allow real-world applications in the metropolitan area. In addition, based on photonic qubits and linear optics, a number of experiments have demonstrated fundamental elements in quantum computing, quantum simulation and quantum metrology.
However, there are still significant obstacles before quantum information science can become useful technology. In this talk, the speaker will describe his research group’s recent experiments toward scalable quantum information processing aiming for practical technologies. In the field of quantum cryptography, they have experimentally realized measurement device independent quantum key distribution, whose security can be ensured even under photon detector attack. In the field of quantum teleportation, they have realized quantum teleportation of multiple degrees of freedom in a single photon.
To extend the secure distance of quantum cryptography, two approaches are undertaken in the speaker’s research group. One is to use cold atom quantum repeaters. To this end, they have developed high-performance quantum memories for single photons, with a storage time of ~0.3s and high readout efficiency. Another route is through the low-loss atmospheric free-space channel. They have established a 100-km free-space link for quantum communication. Moreover, direct and full-scale experimental verifications have been performed for ground-satellite quantum key distribution. Recently, they have demonstrated free-space quantum communication under sunlight, towards a satellite constellation based global quantum network. They have launched a satellite for quantum science, which will offer a unique opportunity to test Bell’s inequality in large scale. The technological advance will, in return, push the fundamental physics forward.
講者簡介
潘建偉教授1992年畢業於中國科學技術大學近代物理系，1995年獲該校理論物理碩士學位及於1999年獲得奧地利維也納大學博士學位。潘教授現為中國科學技術大學常務副校長及教授、中國科學院院士、發展中國家科學院院士、中科院量子資訊與量子科技前沿卓越創新中心主任。
潘教授主要從事量子資訊和量子力學基礎問題檢驗等方面的研究。作為國際上量子資訊實驗研究領域的先驅和開拓者之一，他是該領域有重要國際影響力的科學家。利用量子光學手段，他在量子調控領域取得了一系列有重要意義的研究成果，尤其是他關於量子通訊和多光子糾纏操縱的系統性創新工作使得量子資訊實驗研究成為近年來物理學發展最迅速的方向之一。其研究成果曾1次入選英國《自然》雜誌評選的「年度十大科技亮點」、1次入選美國《科學》雜誌評選的「年度十大科技進展」、6次入選英國物理學會評選的 「年度物理學重大進展」、5次入選美國物理學會評選的「年度物理學重大事件」、9次入選中科院及中國工程院院士評選的「中國年度十大科技進展新聞」。
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