Fig. 3. Verification of conditional teleportation of a classical state.

a We apply an exchange pulse to qubits 3 and 4 after measuring qubits 1 and 2. Here, ϕ = 2πJ₃₄t, where J₃₄ is the induced exchange coupling between qubits 3 and 4, and t is the evolution time given by the x-coordinate of each data point. (ϕ = π corresponds to a SWAP operation.) When the left pair give a singlet, the right pair have the same spin, and no oscillations should be visible. The inset shows the same data from 0 to 32 ns. b Applying an exchange pulse to the left pair after measuring the right pair generates exchange oscillations on the left pair only if the right pair yields a triplet. The inset shows the same data from 0 to 32 ns. Here, ϕ = 2πJ₁₂t, where J₁₂ is the induced exchange coupling between qubits 1 and 2. In both panels, each data point represents the average of 16, 384 single-shot measurements, and the gray elements of the circuits serve to verify teleportation.