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AOPC 2015

Jianwei Pan (University of Science and Technology of China, China)

Scalable quantum information processing with photons and atoms
Pan Jianwei
University of Science and Technology of China, China 

Biography: Pan Jianwei, full professor of physics at the University of Science and Technology of China. He obtained his Ph.D. degree in 1999 from the University of Vienna. In 2011, he was elected as the academician of Chinese Academy of Sciences (CAS). In 2012, he was elected as TWAS Fellow. In 2014, he was appointed as the director of the CAS Centre for Excellence in Quantum Information and Quantum Physics.The research of Prof. Jian-Wei Pan focuses on quantum information and quantum foundations. As one of pioneers in experimental quantum information science, he has accomplished a series of profound achievements, which has brought him worldwide fame. Due to his numerous progresses on quantum communication and multi-photon entanglement manipulation, quantum information science has become one of the most rapidly developing fields of physical science in China in recent years. Till now, Jian-Wei Pan has published 11 papers in Nature, 1 in Science, 20 in Nature research journals and published more than 70 papers in PNAS and Physical Review Letters. For his pioneering works on experimental quantum communication, quantum computation, and multi-photon interferometry, Prof. Pan has received numerous prizes/awards from various academic institutions, such as Fresnel Prize from the European Physical Society (2005), the Outstanding Scientist Prize from the Hong Kong Qiushi Science and Technology Foundation (2005), the Outstanding Science and Technology Achievement Prize from the CAS (2005), Beller’s Lectureship from the American Physical Society (2007), Quantum Communication Award from the International Organization for Quantum Communication, Measurement and Computing (2012), Science and Technology Achievement Prize from Ho-Leung-Ho-Lee Foundation (2013), First Prize of National Natural Science Award (2015) and so on.

Abstract: Over the past three decades, the promises of super-fast quantum computing and secure quantum cryptography have spurred a world-wide interest in quantum information, generating fascinating quantum technologies for coherent manipulation of individual quantum systems. However, the distance of fiber-based quantum communications is limited due to intrinsic fiber loss and decreasing of entanglement quality. Moreover, probabilistic single-photon source and entanglement source demand exponentially increased overheads for scalable quantum information processing. To overcome these problems, we are taking two paths in parallel: quantum repeaters and through satellite. We used the decoy-state QKD protocol to close the loophole of imperfect photon source, and used the measurement-device-independent QKD protocol to close the loophole of imperfect photon detectors—two main loopholes in quantum cryptograph. Based on these techniques, we are now building world’s biggest quantum secure communication backbone, from Beijing to Shanghai, with a distance exceeding 2000 km. Meanwhile, we are developing practically useful quantum repeaters that combine entanglement swapping, entanglement purification, and quantum memory for the ultra-long distance quantum communication. The second line is satellite-based global quantum communication, taking advantage of the negligible photon loss and decoherence in the atmosphere. We realized teleportation and entanglement distribution over 100 km, and later on a rapidly moving platform. Based on the developed technologies, the first quantum science satellite ‘Micius’ has been launched on 16th Aug,2016. ‘Micius’ will establish the first secure QKD from the satellite to the ground with KHz rate over a distance up to 1200 km, which is about 20 orders of magnitudes more efficient than using telecommunication optical fibers as quantum channel, and will test the contradiction between Einstein’s local realism and quantum mechanics for the first time at space-scale. The Quantum Science Satellite is expected to enable intercontinental secure communications and provide a platform for more fundamental tests in the future.
We are also making efforts toward the generation of multiphoton entanglement and its use in teleportation of multiple properties of a single quantum particle, topological error correction, quantum algorithms for solving systems of linear equations and machine learning. Finally, I will talk about our recent experiments on quantum simulations on ultracold atoms. On the one hand, by applyingan optical Raman lattice technique, we realized a two-dimensional spin-obit (SO) coupling and topological bands with ultracold bosonic atoms. A controllable crossover between 2D and 1D SO couplings is studied, and the SO effects and nontrivial band topology are observe.

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