Extended Data Fig. 4: iSWAP oscillations between the two distant spins for increasing β = Δ2s/gd.
From: Cavity-mediated iSWAP oscillations between distant spins
a–c. The spin-photon coupling gs,1(2)/2π is similar as in Fig. 3 for all panels (~ 21.5 MHz), but Δs,1(2)/2π is changed to 110 MHz (β ~ 5), 150 MHz (β ~ 7) and 220 MHz (β ~ 10) for a–c, respectively. The solid lines represent fits to the dispersive Hamiltonian model of Eq. (1), from which we extract the respective interaction strengths 2J/2π of 8.7 MHz, 6.7 MHz and 5.6 MHz. For β = 10, not only the oscillation is slower compared the case of β = 3, but the spin dephasing time was reduced to 20–25 ns in this case, for reasons that are unclear (perhaps a charge fluctuator was activated here). This results in a significantly damped oscillation which makes it difficult to perform a proper fit as one can observe in panel c. The data points in a,c are averaged for \(3\cdot 1{0}^{6}\) times and in b for 2 ⋅ 106 times.
