Quantum Information Science (QIS) is a very new emerging research and education frontier that has generated a great deal of interest and stimulated novel potential applications in the last few years. It combines and draws on the disciplines of physical science, mathematics, computer science, and engineering. Its aim is to understand how certain fundamental laws of quantum physics can be harnessed to dramatically improve the storage, processing and transmission of information. Quantum physics, information theory, and computer science are among the crowning intellectual achievements of the past century.

The QIS focus group supported by National Center for Theoretical Science is to build a platform of communication for researchers in this area. We have established associations and cooperation other researchers all over Taiwan in the last two years; and having been seeking to establish links and exchanges other QIS researchers and activities worldwide. We believe this national program will be joined by many other local researchers in the near future. Although Taiwan has yet to make its mark on the subject internationally, many local researchers are already working on areas bordering on QIS, both theoretically and experimentally. We believe with strong support and encouragement; with the appropriate alignment of theoretical and experimental personnel, by learning from others, by exchanging scholars and information with other institutions; and last but not least - by closely integrating QIS research with Taiwan's commitment, we will be able to ramp up quickly to realize Taiwan's potential in QIS, and to compete on equal footing with other nations in this exciting frontier.

To achieve the above objectives, a program committee has been formed. Its missions include selection of research topics, budget allocation, and invitation of short and long-term visitors and recommendation of candidates for exchange programs, and most importantly, to initiate research activities. The current members and their specializations are:


*Pochung Chen (NTHU), solid-state quantum computation.

*Yueh Nan Chen (NCTU), cavity QED, quantum entanglement etc.

*Chi-Yee Chueng, (AS) quantum commitment and quantum communication.

*Hsi-Sheng Goan (NTU), solid-state quantum computer, quantum decoherence.

*Li-Yi Hsu (CYCU), quantum communication.

*Yan-Ten Lu (NCKU), semniconductor quantum dots

*Chopin Soo (NCKU), quantum entanglement, fundamental quantum physics.

*Zheng-Yao Su (NCHC), quantum algorithms and quantum computation.

*Wei-Min Zhang (NCKU), solid-state quantum computation, and quantum decoherence.


The committee meeting is held once every three to four months. The first committee meeting was in May, and the second committee meeting held in September at National Cheng Kung University.



Outlines of Activities:

With the budget of 1.5 million TWD for the academic year 2005-2006, about 0.5 million is allocated to continue the support for the Post-doc, Dr. Min-Tsung Lee, who has been working on the theory of decoherence in quantum information processes under the focus group since 2005. The main activities the committee has decided to have are the Second Winter School on QIS and the Third Nationwide Workshop on QIS which will be held in the early Janunary of 2007 (it is scheduled from Jan.5-7 for the Winter School and fellowingby the Workshop from Jan. 9-11, 2007.

A. Winter and Summer Schools:

The first Winter School was held on Jan.6-8, 2006 which mainly focuses on quantum decoherence theory in quantum information processes (the detailed program of that winter school can be accessed in the webpage: http://www.cqis.ncku.edu.tw/conferences/2006winterschool/ ). The lecturers are (1) Prof. Bei-Lok Hu (University of Maryland, USA) with topic on “Decoherence and noise in systems for quantum information processing”; (2) Dr. Ting Yu (University of Rochester, USA), with topics on “(i) Non-Markovian quantum trajectory approaches to open quantum systems, (ii) Non-Markovian quantum trajectories versus master equations, (iii) How to apply quantum trajectories to quantum entanglement dynamics? and (iv) Entanglement sudden death: quantum noises and classical noises”; and (3) Dr. Kazutomu Shiokawa (RIKEN, Japan) on “Non-Markovian dynamics of qubits”. The Winter School is very sucessful with focusing topic on quantum decoherence, especially the non-Markovian dynamics in quantum decoherent processes which is a very difficult but also very important subject in the manipulation of quantum information processings. Several students and postdocs have explained great interests in this topic after the winter school. To help these students and young researchers easily start their research in this new field, we organized a small-scale Summer School on August 2-6, 2006 on the same topics (the detailed program can be found in the webpage: http://www.cqis.ncku.edu.tw/conferences/2006summerschool/ , we invited two local young experts, Dr. Chung-Hsien Chou (Academia Sinica) and Dr. Kazutomu Shiokawa (National Center for Theoretical of Sciences) to present totally 20 hours lectures to illustrate in details Feynman's influence functional approach and its applications to decoherence in quantum information processes. Because of these two QIS schools, at least seven young researchers (including four graduate students, two postdoc and one young faculty) have been working on the problems of decoherence in various processes of quantum information and quantum computing. We are sure some products will come out soon in the near future in this very attractive field of QIS.

Since QIS is a very new emerging research and education frontier field, and it combines the disciplines of physical science, mathematics, computer science, and engineering, we intend to create an entire generation of scientists in this critical field and we believe that the school is one of the steps to achieve our vision. The goals of winter school are to bring the young researchers up-to-speed about the new developments in the field of quantum information science and technology (QIST) and related topics, and to promote and strengthen the interactions and exhange of knowledge among local and international researchers. Therefore, we decided to have the second Winter School to cover more topics in QIST. Indeed, we have invited five international experts in this rapidly growing field of quantum computing and quantum information to be the second school lecturers. They are: Prof. Almut Beige (University of Leeds, UK) in the field of quantum optics and implementation of quantum computing; Prof. Andreas Buchleitner (Max Planck Institute, Germany) in the subject of open quantum systems and decoherence; Prof. Navin Khaneja (Harvard University, USA) on quantum control; Prof. Renbao Liu (Chinese University of Hong Kong, Hong Kong) on solid-state quantum computing and spin-bath decoherence control; and Prof. Horace Yuen (Northwestern University, USA) on quantum cryptography. Each lecturer will present four to five one-hour lectures. We expect that more than hundred students will participate the winter school. The detailed program of the Second Winter School can be accessed in the webpage: http://www.cqis.ncku.edu.tw/conferences/2ndwinterschool/ . We hope that this winter school will stimulate more research activities and cooperations among the participants.

B. Workshops:

The nationwide workshop on QIS to be held after the Second Winter School is the 3rd workshop on QIS in Taiwan (the 1 st workshop was held in 2002, the 2 nd one in 2004). The nationwide workshop is aiming to enhance research activities and collaboration among all participants in Taiwan. The third workshop will cover all related subjects in quantum computatiuon and quantum information, and speakers include both theoreists and experimentalists. Approximately 30 speakers will be invited. Also, there are several foreign researchers are interested in attending the workshop, detailed program will be seen soon in the workshop webgape: http://www.cqis.ncku.edu.tw/conferences/3rdworkshop/ .


On July 8-10, QIS focus group/NCTS(south) and NCKU co-sponsored the NCTS-ZIMP workshop on quantum science and technology (ZIMP: Zhejiang Institute of Modern Physics which was formed by the Nobel prize winner, Prof. T. D. Lee in Zhejiang University in 1990). This workshop is aiming to establish the resrarch exhange and coorperation between two centers. Five faculties and one postdoc from ZIMP participated the workshop and were invited to give presentations: Prof. Pi-Mo He talked on Electronic growth: a possible way to fibrication of nanostructures; Prof. He-Ping talked on Quantum Monte Carlo study of mixed-spin chains by using loop- cluster algorithm; Prof. Bo Zheng give the talk on numerical simulations of phase transitions -- from equilibrium to non-equilibrium, Jing-Bo Xu on auantum information processing based on cavity QED and Heisenberg spin chains, Dr. Zhaoxin Xu on QMC simulation on 1d bond disordered spin systems, and Prof. Hong-Ying Jin talked about 1-+ exotic states. NCKU/NCTS(south) also have five faculties and three postdocs participates the workshop and presented talks on their recently work in quantum science and technology. For the detailed program, please see the webpage: http://www.cqis.ncku.edu.tw/conferences/2006NCTS-ZIMPWorkshop/ . By this workshop, we initialized the further exchange of research activities and possible cooperations between the two centger. We have already decided to hold the next workshop in Zhejiang University next year.


In addition, we also held two mini-workshop in June 13 and Oct. 2. when Prof. Maassen Van Den Brink Alexander (RIKEN, Japan, 2006/06/13-2006/06/15), and Prof. Meng Feng (Chinese Academy Science, 2006/09/08-2006/10/07), visited NCTS/South, respectively. Prof. Alexander (invited by Prof. Chopin Soo of NCKU) is an expert on d-wave superconducting quantum computing and his visit to the QIS focus group provided the possible collaboration with local experimental researchers on superconducting quantum computer. Prof. Meng Feng (Invited by Prof. Hsi-Sheng Goan of NTU) has been working on trapped-ion quantum computing for almost ten years, and his visit to QIS focus group did enhance the research connection on the ion-trap quantum computing and related subjects. Further research collaboration becomes possible.


C. Weekly Journal Club:

Besides the schools and workshops, a main actities of QIS focus group is the regular weekly journal club. We have invited more than 20 domestic and international speakers to NCTS/south to give a presentation on QIST and related topics. (see webpage for all the speaker list: http://www.cqis.ncku.edu.tw/eindex.php?name=english/oldspeech.htm ). NCTS postdoc, Dr. Ming-Tsung Lee is the coordinator of the weekly journal club. Such regular weekly seminars attracted many faculties and students to participate. This is very helpful for faculties and students to undertsnad the new development of QIS, and is very useful for the QIS development in Taiwan. We may point out QIS regular weekly seminar activity is the only one that generated purely by the focus group among the 15 focus groups.


D. Participating international workshops:

In addition to the winter and summer school, workshops and weekly seminars held in Taiwan, the committee also decided to organizer/sponsor several researchers and students in Taiwan to join international workshops. Wei-Min Zhang (NCKU) participated the 1 st international workshop on solid-state quantum computing, which was held in Nanjinag University, China on June 9-12, 2006, as a organizing committee number of the workshop and gave an invited talk on quantum dot quantum computing in the workshop. The organizing committee also decided that the 2nd workshop will be held in Taiwan with support from the QIS focused group and NCKU. Hsi-Sheng Goan of NTU also participated the 2 nd Asia-Pacific Conherence and KIAS-KAIST 2006 Workshop on Quantum Information Science, which was hold in Korean on August 26-30, 2006, as a organizing committee number of the workshop and gave an invited talk on quantum decoherence (The 1 st one was held in NCUK in 2004, sponsored by NCTS/South). In addition, the focus group also support three postdoc and one student participated the international workshops: Dr. Yueh-Nan Chen (postdoc in NCTU) is supported to participate the 20 th International Conference on Atomic Physics in Innsbruck on July 16-29, 2006, Austria, presented a paper “Entanglement Swapping via Superradiance” in the workshop and visisted Prof. T. Brandes and Prof. J. W. Pan in Berlin and Heidelberg ( Germany), during these visits, There, they initiated a new idea about QD qubits coupled to the surface plasmon modes in nano-structures. It is conjectured that the surface plasmon modes in nano-structures may play the role as optical cavities. Therefore, future cooperation between Prof. Brandes and Dr. Chen will be focused on the dynamics of QD quits coupled to the plasmon modes and its possible applications in quantum information science ; Dr. Ming-Tsung Lee (postdoc. in NCKU) is supported to attend the 1 st international workshop on solid-state quantum computing which was held in Nanjinag University, China on June 9-12, 2006; Mr. Kuan-Liang Liu (Prof. Shi-Sheng Goan's student in NTU) is supported to attend the 2nd Asia-Pacific Conference and KIAS-KAIST 2006 Workshop on Quantum Information Science in Korean on Aug. 26-30, and Dr. Xiao-Zhong Yuan (postdoc in NTU) is supported to participate the 8 th international workshop on quantum information, quantum measurement and quantum computation in Japan on Nov. 28-Dec.3., 2006.


E. Long and Short term visitors:

The focused group also sponsored short and long term visitors. Two short-term visitors, Prof. Jian-Hui Dai (Zhejiang Institute of Modern Physics) and Prof. Meng Feng (Chinese Academy Science) are invited to visit the center for one month. Their visits are particularly chosen to extend the research activities in National Cheng Kung University and National Taiwan University. Prof. Jian-Hui Dai is an expert on low-dimensional spin chain systems. He have collaborated with Wei-Min Zhang (NCKU) to complete an un-finished paper on antiferromagnetism that Wei-Min Zhang written a few years. The paper was published in PRL. In April, Prof. Jian-Hui Dai was invited to visit NCKU to continue the research on further application of the theory proposed in that paper. Prof. Meng Feng is invited by His-Sheng Goan for seeking the possible collaborations. Prof. Feng visited NTU for three weeks and one week in NCKU. During his stay in NCKU, QIS group in NCKU has discussed extensively with Prof. Feng, and we initiated an idea of generating photon entangled states from the quantum dot cellylar automata, further research is in progress. In addition, we also invited a long-term visitor, Prof. Wang Shun-Jin, an expert on algebraic method of solving non-linear and stochastic dynamics from Sichuan University. Prof. Wang (invited by Wei-Min Zhang, NCKU) will visit NCTS/South from October for three months. He will present a course on the algebraic method of solving non-linear and stochastic dynamics equations, which could be useful in the study of decoherence master equations.




The quantum decoherence in quantum information processing is one of the most important subject in QIST. The winter school and summer school on quantum deocherence held this year had initialized a great reseach interest among the school participants. In particular, Prostdocs Ming-Tsung Lee and An Jin Hong have made some progress on the fundamental theory of quantum decoherence. They apply Keldesh's closed-time green function approach and Feynman's influcnerence functional method to the cavity QED and charge quibit measurement in nanostructures, respectively. Current studies on quantum decoherence in quantum information processes are mostly based on Markovian approximation, while only few works explored the non-markovian dynamics. The fundamental approachs to explore the non-Markovian are the Feynaman's influerence functional method (conventionally for bosonic environments, such as the heat bath and electromagnetic noises) and Keldesh's closed-time Green function approach (applicable to both the bosonic and fermionic environments). Feynman's method has been successfully applied to explore the decoherence in Quantum Browian Motion by the group leaded by Prof. Bei-Lok Hu, the distinguished lecturer of the 1 st winter school.

The 1 st winter school helped the younger researches to intensively work on this subject. Two graduate students (of NCKU)) took this subject as their Master thesis after the school and graduated this summer. Two young faculties and two posdoc have been focusing their research on this topic as well since the winter school.


Administrative Data:

1. List of Speakers for Weekly Seminars

* 2006/01/03 Ming-Shien Chang

Georgia Institute of Technology, USA


* 2006/01/09 Guang-Yu Guo

Dept. of Physics, NTU.


*2006/02/13 何應瓏

Dept. of Electrical and Electronic Engineering, Univ. of Bristol United Kingdom


*2006/02/14 Prof. Pochung Chen

Dept. of Physics, NTHU.


* 2006/02/17 鐘淑維

Dept. of Physics, NTHU.


* 2006/02/20 Ray-Kuang Lee

Dept. of Electrical Engineering, NTHU.


*2006/03/06 Yue-Min Wan

Dept. of Electronic Engineering,I-Shou Univ.


*2006/03/14 Li-Yi Hsu

Dept. of Physics, Chung Yuan Christian Univ.


*2006/03/20 Wen-Bin Jian

Dept. of Electrophysics, NCTU.


*2006/03/27 Jianhui Dai

Zhejiang Institute of Modern Physics


*2006/04/10 Zheng-Yao Su
National Center for High-performance Computing


*2006/04/17 Yinchieh Lai

Dept. of Photonics, NCTU


*2006/04/24 Shin-Chuan Gou

Dept. of Physics, Nat. Changhua Univ. of Education


*2006/05/01 Kao-Chin Lin

Dept. of Electrophysics, NCTU


*2006/05/08 Jun-Hong An

Dept. of Physics, NCKU


*2006/05/09 Shin-Tza Wu

Dept. of Physics, NCCU


*2006/05/15 Kuang-I Lin

Dept. of Physics, NCKU


*2006/05/19 Chung-Hou Chung

Univ. Karlsruhe, Germany


*2006/05/22 Bei-Lok Hu

Univ. of Maryland, USA


*2006/05/22 黃俊峰

Nat. Measurement Laboratory, Industrial Technology Research Institute


*2006/05/29 Shu-Fen Hu
Nat. Nano Device Laboratories


*2006/06/05 Yong-Fan Chen

Dept. of Physics, NTHU


*2006/06/12 朱紋慧

Dept. of Materials Science and Engineering, NCKU


*2006/06/20 Chanchal Chaudhuri

Nat. Synchrotron Radiation Research Center


2. Visiting of international visitors

* Kazutomu Shiokawa (RIKEN, Japan):2006/01/06-2006/01/08

*Bei-Lok Hu (University of Mary land): 2006/01/06-2006/01/08

*Ting Yu (University of Rochester, USA): 2006/01/06-2006/01/08

*Jian-Hui Dai (Zhejiang Institute of Modern Physics): 2006/03/08-2006/04/08

*Maassen Van Den Brink Alexander (RIKEN, Japan): 2006/06/13-2006/06/15

*Pi-Mo He (Zhejiang University): 2006/07/07-2006/07/14

*Hong-Ying Jin (Zhejiang University): 2006/07/07-2006/07/14

*Jing-Bo Xu (Zhejiang University): 2006/07/07-2006/07/14

*Zhaoxin Xu (Zhejiang University): 2006/07/07-2006/07/14

*He-Ping Ying (Zhejiang University): 2006/07/07-2006/07/14

*Bo Zheng (Zhejiang University): 2006/07/07-2006/07/14

*Eong-Cherng Liang (University of Queensland): 2006/09/06-2006/09/08

*Mang Feng (Chinese Academy of Science): 2006/09/07-2006/10/08


3. Activities

1. 2006 Winter School on Quantum Information Science: 2006/01/06-2006/01/08

2. NCTS - ZIMP Workshop on Quantum Science and Technology: 2006/07/08 -2006/07/10

3. Summer School on Quantum Decoherence and Quantum Computation: 2006/08/02 -2006/08/06

4. Mini-workshop on Quantum Information Science: 2006/10/02

5. The Second Winter School on Quantum Information Science: 2007/01/05 -2007/01/08

6. The Third Winter School on Quantum Information Science: 2007/01/09 - 2007/01/11

7. Weekly Journal Club on Quantum Information Science seminar


Committee member of focused group:

Hsi-Sheng Goan National Taiwan Univ .
Yueh-Nan Chen National Cheng Kung Univ.
Wei-Min Zhang(coordinator) National Cheng Kung Univ.
Pochung Chen National Tsing Hua Univ .
Chi- Yee Cheung Academia Sinica
Yan-Ten Lu National Cheng Kung Unvi.
Chopin Soo National Cheng Kung Univ.
Chih Long Chou Chung Yuan Christian Univ.
Zheng-Yao Su National Center for High-Performance Computing