Fig. 1: Degenerate spin qubits in a global field.
From: Entangling gates on degenerate spin qubits dressed by a global field
Operation using (a) spectral selectivity of non-degenerate spins and (b) local electrode selectivity of degenerate spins for individual qubit control. c Adiabatic inversions of two spins with varying in-plane static magnetic field angle γ using \(\left\vert \downarrow \uparrow \right\rangle\) initialisation and adiabatic singlet-triplet (ST) readout. The frequency detuning is offset for each sub-panel. d High-resolution adiabatic inversion with parity readout at γ = 224∘ where the spin qubits are quasi-degenerate. e, f Rabi chevrons of quasi-degenerate spins simultaneously driven by a global field with adiabatic ST and parity readout, respectively. The initial states are \(\left\vert \downarrow \uparrow \right\rangle\) and \(\left\vert \downarrow \downarrow \right\rangle\), respectively, with Larmor frequencies 10.362 GHz and 23.221 GHz. Traces at the centre frequencies are plotted below. Circuit models and simulations are shown in the bottom of (e) and (f).
