1. School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
2. Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU‐Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 P. R. China
3. International Joint Innovation Center ZJU‐UIUC Institute Zhejiang University Haining 314400 P. R. China
4. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
5. Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore 637371 Singapore
6. UMI 3288 CINTRA CNRS/NTU/THALES Nanyang Technological University 50 Nanyang Drive Singapore 637553 Singapore