Prof. LI Chuanfeng and Prof. XIANG Guoyong's group from University of Science and Technology of China (USTC) made great progress in experimental investigation of quantum coherence and reported the first experimental test of assisted distillation of quantum coherence, which might be helpful in remote quantum information processing and quantum control.
Figure 1 Experimental Set up (Image by LI Chuanfeng & XIANG Guoyong)
A recent theoretical frame work [Phys. Rev. Lett. 116, 070402 (2016)] study the task of assisted distillation of quantum coherence and provided a theoretical solution to this problem. To fill the gap of experimental test of the task in assisted distillation of quantum coherence, Prof. Chuan-Feng Li and Prof. Guo-Yong Xiang’ group experimentally implement a class of such LQICC protocols based on a linear optic system, for extracting the maximal distillable coherence on one subsystem in our single-shot photonic scheme.
Figure 2 Experimental results for two classes of pure states (Image by LI Chuanfeng & XIANG Guoyong)
Figure 3 Experimental results for Werner states (Image by LI Chuanfeng & XIANG Guoyong)
The results show that even in the presence of experimental imperfections and limitations, a maximal increase in distillable coherence can be observed even in the single-copy scenario for pure states. Furthermore, the experimental study with a specific class of mixed states is also reported, which showed that distillable coherence can be increased with less demand than entanglement distillation and also shed light on the strong relationship between quantum coherence and quantum correlation.
The results of the research have been published on Optica, the Journal of OSA. Graduate student WU Kangda and Postdoctoral researcher HOU Zhibo contributed equally to this work. This Work is supported by National Natural Science Foundation of China (NSFC) (11574291); National Key R&D Program (2016YFA0301700).
Prof. XIANG Guoyong
Key lab of Quantum Information
University of Science & Technology of China
On May 11, the Nature Publishing Group released Nature Publishing Index 2010 China, remarking “a dramatic rise in the quality of research being published by China”. University of Science and Technology of China is ranked 3rd of TOP 10 Institutions in Index 2010 China.
This article came from News Center of USTC.