Recent Progress in Quantum Information
In this issue, three researchers from Taiwan and Korea are invited to review the recent developments in quantum information. Their reports have covered some essential components such as quantum computing, quantum communication, and open quantum system.
A long-lived obstacle in quantum communication is to preserve the quantum memory. Aiming at this, Prof. Ite Yu from the National Tsing Hua University in Taiwan and his collaborators report the results they have obtained recently on experimentally improving the efficiency of EIT (electromagnetically induced transparency)-based quantum memory from 50% to about unity. A recent new approach for quantum computing, quantum steering, is reviewed by Prof. Che-Ming Li from the National Cheng-Kung University in Taiwan. He also introduces his new experimental results for two new types of quantum steering, which can lead to potential applications in relation to quantum networks and quantum information.
When quantum systems are applied to information processing, such as computational or communication tasks, it is critical to know how the information is affected by the environment. An understanding of the dynamics of an open quantum system is therefore required. Prof. Joonwoo Bae at Hanyang University in Korea overviews recent developments regarding this, and also introduces his recent theoretical results on optimal guessing with quantum side information, the operational characterization of the dynamics of open quantum systems, and feasible methods for detecting entangled states.
Guang-Yin Chen is an associate professor at the department of physics, National Chung Hsing University, Taichung, Taiwan. He received a BSc in 2004 from the National Chung Hsing University, and a PhD in 2010 from the National Chiao Tung University, Taiwan. During his PhD, He spent one year (2008-2009) at the University of Freiburg in Germany as a visiting scholar. From 2010 to 2013, he worked as a postdoctoral research fellow at the National Cheng-Kung University, Tainan, Taiwan. He was also an adjunct researcher at RIKEN in Japan from 2012 to 2013. He joined the faculty of the department of physics at the National Chung Hsing University in 2013. His research field is theoretical quantum optics, quantum entanglement, quantum biology, and open quantum systems.