1. Department of Materials, Quantum Information Processing Interdisciplinary Research Center, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom, Clarendon Laboratory, Department of Physics, Quantum Information Processing Interdisciplinary Research Center, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom, Sensors and Electronics Division, QinetiQ, St. Andrews Road, Malvern, Worcs. WR14 3PS,...