Fig. 3: Coherence metrics of degenerate qubits.
From: Entangling gates on degenerate spin qubits dressed by a global field
a Free-induction decay and (b) Hahn echo measurement applied to degenerate qubits, where oscillations of frequency f are introduced for fitting purposes. Chevron with (c) square modulation and (d) sinusoidal modulation acquired in an interleaved manner where the global microwave frequency is swept. Here, \({\Omega }_{{{\rm{SMART}}}}(t)=\sqrt{2}{\Omega }_{{{\rm{R}}}}\cos \left(2\pi {T}_{{{\rm{mod}}}}^{-1}t\right)\). The extracted \({T}_{2}^{{{\rm{2QRabi}}}}\) times are plotted in (e) and (f) and the grey shaded area represents \({T}_{2}^{{{\rm{2QRabi}}}} > 10\,\mu {{\rm{s}}}\).
