[1] The MITRE Corporation, McLean,VA,22102, United States
[2] Quantum Technology Center, University of Maryland, College Park,MD,20742, United States
[3] Department of Electrical and Computer Engineering, University of Maryland, College Park,MD,20742, United States
[4] Department of Physics, University of Maryland, College Park,MD,20742, United States
[5] Department of Physics, Harvard University, Cambridge,MA,02138, United States