Fig. 2

Spin-mixing map and coherence without displacement. a Two-electron spin mixing map at B = 90 mT. From the position R in Fig. 1b, 50-ns pulses of amplitude V ₁ and V ₂ are simultaneously applied on V _M,1 and V _M,2, respectively, before performing single-shot read-out of the two-electron spin states to extract the singlet probability. In the separated configurations, S mixes with T₀. In between two of these regions, one electron is exchanged between two dots and the spin mixing is less effective due to the increase of the exchange interaction (see Supplementary Note 3 and Supplementary Fig. 3). The arrows represent the (V ₁, V ₂) voltage pulses used to implement the separation and the displacement of the electrons and presented in Fig. 3a. The influence of the tunnel-coupling on the spin-mixing map is discussed in Supplementary Note 5. b Singlet probability as a function of the time τ _s spent in separated configurations, where the electrons are static in (0, 1, 1), (1, 1, 0) and (1, 0, 1), (orange, blue and purple, respectively). The data are fitted with a Gaussian decay with a characteristic time T ₂ ^*, respectively, equal to 9.0 ± 0.3, 9.9 ± 0.4 and 10.2 ± 0.4 ns