Extended Data Fig. 1: Determination of the number of donors in a qubit from the quantum dot charging energies.
From: A two-qubit gate between phosphorus donor electrons in silicon
a, RF-SET Coulomb diamonds. b, Gate–gate map around the (1, 3) ↔ (2, 2) charge transition and definitions of \({\rm{\delta }}{V}_{{\rm{g}}}^{{\rm{D}}{\rm{D}}}\), \({\rm{\Delta }}{V}_{{\rm{g}}}^{{\rm{S}}}\), \({\rm{\delta }}{V}_{{\rm{g}}}^{{\rm{S}}}\) and \({\rm{\delta }}{V}_{{\rm{g}}}^{{\rm{D}}}\). c, Gate–gate map for the regime with two electrons on donor qubits and definition of \({\rm{\Delta }}{V}_{{\rm{g}}}^{{\rm{D}}}\).
