1. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA.
2. Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.
3. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
4. RA4-403, Intel Corporation, 2501 NW 229th Avenue, Hillsboro, OR 97124, USA.
5. Purdue Quantum Center, Purdue University, West Lafayette, IN 47907, USA.