1. Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
2. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
3. Applied Research Laboratories, University of Texas at Austin, 10000 Burnet Road, Austin, Texas 78758, USA
4. Texas Advanced Computing Center, University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, USA