Fig. 2 | Nature Communications

Fig. 2

From: Two-electron spin correlations in precision placed donors in silicon

Fig. 2

Controllable exchange interaction between precision placed donor-based spin qubits. a We prepare a random spin on one qubit and deterministically spin-down on the other near the readout positions in the (1,1) charge region shown by the red and blue circles. After moving into the (1,1) region equidistant between the readout positions for 1 ms (start of arrow), a 50 ms pulse is applied along the detuning axis shown by the black arrow to the positions marked by the black circles. Subsequent pulses are applied to perform spin readout on both qubits. bd The probabilities of the joint two-spin outcomes from sequential spin-readout of L and R plotted against the detuning energy, \(\epsilon\). For the initially prepared state ρ↓↑ the blue circles show the outcome of two-electron spin readout which is performed at approximately \(\epsilon\) = −7 meV detuning in the (1,1) charge region where exchange is negligible (see Fig. 1). The red crosses show the equivalent data set for an initially prepared state ρ↑↓

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