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Extended Data Fig. 3 | Demonstration of qubit operation at a second hole
occupancy. a, Charge stability diagram showing the (m, n) hole occupancy
used during all experiments in the main text, as well as the (m, n + 1) occupancy
for which we observe PSB as well. For an unpolarized filling of the quantum
dots, one expects an alternating suppression of the transport current due to
PSB, as spin blockade occurs only when an orbital level is fully occupied.
However, the spin-filling for holes is known to be highly polarized^34 ,^35 , and
therefore PSB can occur in sequential quantum dot fillings. b, Coherent Rabi
oscillations measured in the (m, n + 1) occupancy. A slight linear offset is
observed for Q1, which can be attributed to the microwave power. We note that,
for the same microwave power, the Rabi frequency of Q2 in the (m, n + 1)
occupancy is increased substantially compared to the (m, n) filling. We
attribute this to the hole being in a different orbital, where the effective SOC
may be different.