Abstract:

This presentation contains two parts. In the first part, I will talk about a theoretical discovery of a possible application of quantum teleportation, i.e., Global Positioning Scheme via Quantum Teleportation. Quantum teleportation scheme is undoubtedly an inspiring theoretical discovery as an amazing application of quantum physics, which was experimentally realized several years later. For the purpose of quantum communication via this scheme, an entangled ancillary pair shared by Alice and Bob is the essential ingredient, and a quantum memory in Bob's system is necessary such that the quantum state is kept at least until the classical message from Alice arrives. Yet, the quantum memory remains a challenge in both technology and rationale. Here we show that the quantum teleportation also provides fresh perspectives in an alternative scheme for global positioning system. Referring to fixed locations of Bob and Charlie, Alice can determine her relative position by comparison of quantum states before and after teleporting around via Bob and Charlie successively.

In the second part, I will briefly talk about a Quantum Approach to Fast Protein Folding, and Quantum Simulation of Protein Misfolding Behavior. The study of protein folding is fundamental and important in multidisciplinary field because a diversity of diseases, like Alzheimer's and Parkinson's result from protein misfolding. As a fundamental issue, the Levinthal paradox of the folding time has long been a standing theoretical question. Previous progresses, till now, are made on the base of “energy-landscape” with various artificial hypotheses. Recently, we proposed a self-contained quantum approach to explore a fast protein folding time. Meanwhile, the current thermodynamic and geometric approaches only phenomenologically describe but do not provide a mechanistic understanding about the competition between correct folding and misfolding. Here we present a quantum simulation to understand such behaviors. Considering the influence of dissipative strength for all possible sequences and comparing the folding times toward different compact structures, we obtain a phase diagram of dissipative quantum phase transition that enable us to model such behaviors. We also investigate how a perturbation in the Hamiltonian affects the transition point, which may motivate us to explore possible manual interventions.

Short Bio:

李有泉教授，于蘭州大學物理系先后獲學士學位(1983)、碩士學位(1986)、博士學位(1989)。1990年12月至1992年12月于浙江大學從事博士后科研工作。1993年起在浙江大學任教，期間學術訪問意大利國際理論物理中心ICTP（1992.7-8；1996.6-9）、瑞士聯邦理工EPFL(1997.3-12)、美國辛辛那提大學（1997.12-1998.3）、德國奧格斯堡大學（1999.3-2001.8）、香港中文大學（2002.2-5）、香港大學（2005.5-6；2006.5-6）等。

長期從事理論凝聚態物理研究工作，以第一作者或通訊作者發表SCI論文160余篇；主持省部級以上科研項目14項，含國家自然科學面上項目8項、國家杰出青年科學基金項目1項、國家重點研發計劃項目1項；獲國家自然科學二等獎1項、中國高校自然科學一等獎1項；入選“教育部領軍人才項目特聘教授”（2001年），“新世紀百千萬人才工程”國家級人選（2006年），“國家萬人計劃”--百千萬工程領軍人才（2014年）；獲全國“五一”勞動獎章（2003年）、留學回國人員成就獎章（2003年）及第八屆中國青年科技獎（2004年）；曾擔任《科學通報》、《Frontiers of Physics in China》、《物理學進展》等期刊編委，現擔任中國物理學會秋季會議（CPS Fall Meeting）、全國磁學理論會議等組委會委員。

研究方向: 理論凝聚態物理，量子物理新奇效應及其潛在應用