讲座题目：The Quantum Way of DoingComputations

主讲人：Rainer Blatt  Institute for Experimental  Physics,University of Innsbruck and Institute of Quantum Opticsand  Quantum Information Austrian Academy of Science

主持人：马龙生

开始时间：2016-03-04 16:00:00

讲座地址：中北理科大楼A504报告厅

主办单位：精密光谱科学与技术国家重点实验室

报告人简介：

 Rainer Blatt graduated in physics from the University ofMainz in 1979.  He finished his doctorate in 1981 and worked as researchassistant in the  team of Günter Werth. In 1982 Blatt received a research grantof the  Deutsche Forschungsgemeinschaft (DFG) to go to the Joint Institute  forLaboratory Astrophysics (JILA), Boulder, and work with John L. Hall  (NobelPrize winner 2005) for a year. In 1983 he went on to the Freie  UniversitätBerlin, and in the following year joined the working group of  Peter E. To-schekat the University of Hamburg. After another stay in  the US, Rainer Blattapplied to qualify as a professor by receiving the  “venia docendi” inexperimental physics in 1988. In the period from 1989  until 1994 he worked as aHeisenberg research fellow at the University of  Hamburg and returned severaltimes to JILA in Boulder. In 1994 he was  appointed professor of physics at theUniversity of Göttingen and in the  following year he was offered a chair inexperimental physics at the  University of Innsbruck. Since 2003 Blatt has alsoheld the position of  Scientific Director at the Institute for Quantum Opticsand Quantum  Information (IQOQI) of the Austrian Academy of Sci-ences (ÖAW).


报告摘要：

 Since the mid-nineties of the 20 th century it became apparent that one  of thecenturies’ most important technological inventions, computers in  general and manyof their applications could possibly be further  enormously enhanced by usingoperations based on quantum physics. This is  timely since the classicalroadmaps for the development of computational  devices, commonly known asMoore’s law, will cease to be applicable  within the next decade due to the eversmaller sizes of the electronic  components that soon will enter the quantumphysics realm. Computations,  whether they happen in our heads or with any computationaldevice, always  rely on real physical processes, which are data input, data  representationin a memory, data manipulation using algorithms and  finally, the data output. Buildinga quantum computer then requires the  implementation of quantum bits (qubits) asstorage sites for quantum  information, quantum registers and quantum gates fordata handling and  processing and the development of quantum algorithms.

 In this talk, the basic functional principle of a quantum computer will  bereviewed. It will be shown how strings of trapped ions can be used to  build aquantum information processor and how basic computations can be  performed usingquantum techniques. In particular, the quantum way of  doing computations willbe illustrated by analog and digital quantum  simulations and the basic schemefor quantum error correction will be  introduced and discussed. Scaling-up theion-trap quantum computer can be  achieved with interfaces for ion-photon entanglementbased on  high-finesse optical cavities and cavity-QED protocols, which will be  exemplifiedby recent experimental results.