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Manipulation and readout of spin qubits in quantum dots made in III-Vmaterials successfully rely on Pauli blockade that forbids transitions betweenspin-triplet and spin-singlet states. Quantum dots in group IV materials havethe advantage of avoiding decoherence from the hyperfine interaction bypurifying them with only zero-spin nuclei. Complications of group IV materialsarise from the valley degeneracies in the electronic bandstructure. These leadto complicated multiplet states even for two-electron quantum dots therebysignificantly weakening the selection rules for Pauli blockade. Only recentlyhave spin qubits been realized in silicon devices where the valley degeneracyis lifted by strain and spatial confinement. In carbon nanotubes Pauli blockadecan be observed by lifting valley degeneracy through disorder. In cleannanotubes, quantum dots have to be made ultra-small to obtain a large energydifference between the relevant multiplet states. Here we report onlow-disorder nanotubes and demonstrate Pauli blockade based on both valley andspin selection rules. We exploit the bandgap of the nanotube to obtain a largelevel spacing and thereby a robust blockade. Single-electron spin resonance isdetected using the blockade.

Valley-spin blockade and spin resonance in carbon nanotubes