Extended Data Fig. 11. State exchange operations of a Bell pair between two quantum registers.

a, As part of the ancilla-based parity readout (Fig. 5a,b), we employ a state exchange between two quantum registers. Shown is the generation and swap of a Bell pair from two inner atoms to two outer atoms which did not interact directly. b, c, Characterization of the resulting long-range Bell pair. We obtain a population overlap of 0.842(8) and a parity contrast of 0.71(2), yielding a raw fidelity of 0.78(1).