The Future of
How to Tame a
Schrödinger Cat
Is the Vacuum
Really Empty?
01 About
Laser Laboratory
The quantum-field laser laboratory is led by Prof. Kyungwon An. Its research interest covers the cavity-QED microlaser, single-atom single-photon quantum interface and quantum chaos in microcavities. For detailed information on our research, please see [02 Research] section below. Prof. An, as a PI, has successfully completed the WCU (world class university) project (type 2) collaborating with Profs. Hyunseok Jung and Yong-il Shin in fundamental studies with Bose-Einstein condensates and their applications. Prof. An's group is now supported by Samsung Science and Technology Foundation. our grants
We collaborate with MIT Spectroscopy Laboratory (Dr. Ramachandra Dasari) in the study of the cavity-QED microlaser. We also collaborate with Prof. Sang-Wook Kim at Pusan National University on quantum chaos in deformed microcavities, and Prof. Hyunchul Nha at Texas A&M at Qatar and Prof. Young-Tak Chough at Kwangju University on quantum information.
02 Research
It is after the mid 20th century that the human race began to control the light absorption and emission as they intend. By understanding the light-matter interaction, the phenomenon that light changes the state of matter and the matter changes that of light in turn, various technical applications have been made. Through extensive researches till now, two fundamental principles have been identified that can enhance the light-matter interaction. The first is the Purcell effect and the second is the Petermann effect. The Purcell effect is based on the enhancement in vacuum electromagnetic fields and it is well explained by the cavity quantum electrodynamics (QED), which is the field where S. Haroche was awarded a Nobel Prize in physics in 2012. The less-known Petermann effect is referred to the phenomenon that the light-matter coupling is increased due to the bi-orthogonality of resonant modes in a non-Hermitian system. It has been often studied in the context of excess spontaneous emission noise in unstable resonators.

Our laboratory performs various researches to investigate the light-matter interaction at the most fundamental level based on these two principles. We study quantum optics and quantum information by using atom-cavity systems, single-atom trapping and optical lattices. In asymmetric microcavities, we investigate quantum chaos in the context of inter-mode interactions, dynamical tunneling and the interaction between a gain medium and bi-orthogonal cavity modes. Through these studies, we aim to discover new phenomena and apply them to ultrahigh-efficient quantum light sources and quantum information processing.

● NEW → Introduction to graduate researches 2016 (pdf)
● NEW → A lecture introducing our laboratory (streaming), ppt summary(pdf), and an aticle (in Korean)
● NEW → An article (in Korean) explaining the 2012 Nobel prize in physics - Generation of individual photon states and nondestructive state measurements
● NEW → An article (in Korean) on quantum information and quantum field sources based on atom-cavity systems

03 People
Principal Investigator
Prof. Kyungwon An
Faculty of school of Physics
Prof. Songki Moon
Faculty of Liberal Education
Dr. Kyu-Won Park
BK21 Plus Postdoc
Younghoon Song
Ph.D candidate
Younghoon Shin
Ph.D candidate
Jung-Ryul Kim
Ph.D candidate
Myonggyu Hwang
Ph.D. candidate
Joonki Kim
Ph.D. candidate
Kyeongock Chong
Ph.D. candidate
Soyun Kim
Ph.D. candidate
Daeho Yang
Ph.D. candidate
Jinuk Kim
Ph.D. candidate
Seung-Hoon Oh
Ph.D. candidate
Gibeom Son
Ph.D. candidate
05 Seminars
Exceptional points in coupled microdisks | Speaker: Dr. Jung-Wan Ryu (IBS Center for Theoretical Physics of Complex Systems) | Date & Time: 11:00-12:00, April 27(Wed), 2016 | Place: 56-521
An enhanced quantum interface through collective ion-cavity coupling | Speaker: Dr. Tracy Northup (Institut für Experimentalphysik Universtität Innsbruck) | Date & Time: 11:00-12:00, October 7(Wed), 2015 | Place: 56-521
Searching for axion dark matter | Speaker: Prof. Yannis K. Semertzidis (Director of Center for Axion and Precision Physics, IBS, KAIST) | Date & Time: 16:00-17:00, January 12(Mon), 2015 | Place: 56-321
Complex Paths for Regular-to-Chaotic Tunneling | Speaker: Dr. Normann Mertig (Tokyo Metropolitan University) | Date & Time: 16:00-17:00, September 18(Thr), 2014 | Place: 23-419
How to make Bose-Einstein condensate in an optical cavity | Speaker: Dr. Moonjoo Lee (ETH Zurich) | Date & Time: 16:00-17:00, August 21(Thr), 2014 | Place: 56-321
Two neutral atoms coupled to a high-finesse optical cavity: towards a maximally entangled state of two atoms | Speaker: Dr. Seokchan Yoon (University of Bonn) | Date & Time: 16:00-17:00, August 19(Tues), 2014 | lace: 56-321
Dissecting rhythmic behaviors in a worm | Speaker: Prof. Christopher Fang-Yen (University of Pennsylvania) | Date & Time: 16:00-17:00, June 3(Tues), 2014 | Place: 23-417
Quantum Goos-Haenchen effects at planar and curved step potentials | Speaker: Prof. Soo-Young Lee (Kyungpook National University) | Date & Time: 16:00-17:00, May 29(Thur), 2014 | Place: 56-521
On realization of a cavity-QED laser emitting a highly sub-Poissonian, anti-bunched beam of photons in a CW fashion | Speaker: Prof. Young-Tak Chough (Gwangju University) | Date & Time: 16:00-17:00, March 21(Fri), 2014 | Place : 56-321