posted on 2023-06-09, 08:58authored byM A Broome, T F Watson, D Keith, S K Gorman, M G House, J G Keizer, Samuel HileSamuel Hile, W Baker, M Y Simmons
In this work we perform direct single-shot readout of the singlet-triplet states in exchange coupled electrons confined to precision-placed donor atoms in silicon. Our method takes advantage of the large energy splitting given by the Pauli-spin blockaded (2,0) triplet states, from which we can achieve a single-shot readout fidelity of 98.4 ± 0.2%. We measure the triplet-minus relaxation time to be of the order 3 s at 2.5 T and observe its predicted decrease as a function of magnetic field, reaching 0.5 s at 1 T.