Fig. 11: Fusion and fission protocols.
From: An architecture for two-qubit encoding in neutral ytterbium-171 atoms
a We perform an inter-ququart Bell-basis measurement between the nuclear qubit for C1 and optical qubit for C2, which is followed by measurements on two ququarts that project each ququart on a singlet or triplet. Finally, we perform local unitary operations based on the Bell-basis measurement outcome i (and the rearrangement based on the triplet measurement outcomes). b We perform a Bell-basis measurement on the last ququart. This will disentangle the last ququart from the others, leaving the remaining L − 1 ququarts in an AKLT state. This AKLT state is as if the initial right boundary state was \({O}_{i}\left\vert R\right\rangle\), where Oi is X, Y, or Z depending on the measurement outcome.
