Pairwise fermion-parity measurements involving an ancillary Majorana mode can reproduce a Majorana braiding operator without physically moving the zero modes. Projecting the ancilla back to its initial parity sector turns the product of projectors into the braid unitary up to normalization and known outcome-dependent signs.
A forced Majorana parity measurement alternates an undesired pairwise measurement with a reference parity measurement until the desired outcome occurs. Anticommuting parity observables give either result with probability one half, so the protocol terminates almost surely with a geometric waiting time.
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