1 Department of Physics, National University of Singapore, Singapore 117551, Singapore. Electronic address: phyzhuw@gmail.com.
2 Department of Physics, National University of Singapore, Singapore 117551, Singapore; Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore. Electronic address: phygj@nus.edu.sg.
3 Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. Electronic address: raditya.bomantara@kfupm.edu.sa.