Fig. 3. Site-resolved manipulation within the register of qubits.

a A measurement to bound the relaxation time (T₁) between the qubit states, taken in a single run by selectively rotating a subset of the qubits (indicated in the inset) to the $∣\uparrow ⟩$ state before a variable hold time. Each data point comprises >600 counts. b A demonstration of Ramsey oscillations on individual qubits, where each qubit is given a unique combination of static phase offset ϕ_i and artificial detuning f_i (where f_i is the rate of phase accumulation used to set the phase of the final π/2 pulse), as specified by the circuit diagram. Solid lines are sinusoidal curves with phase offset and artificial detuning fixed to their programmed values. Each point comprises about 200 counts. All data points have error bars representing the standard error of the mean, but in most cases these are smaller than the point markers.