  Non-Abelian e/4 quasiparticles at 5/2 filling factor in a correlated
two-dimensional electron gas have a proposed specific property in an
interference measurement of their edge propagation: encircling an even number
of localized e/4 quasiparticles allows expression of e/4 Aharonov-Bohm (A-B)
oscillations, but suppression of these oscillations will occur with an odd
number encircled. This picture is tested explicitly here in multiple
interferometers of different areas. The encircled localized e/4 quasiparticle
number near 5/2 filling factor is changed by sweeping B-field, and oscillations
are observed in resistance near 5/2 of period specific to that device area for
each interferometer. The product of the measured interferometric area of each
device and the respective 5/2 resistance oscillation period is found to agree
with the expected flux quanta addition needed for parity change in the
localized e/4 number. This result shows a highly specific non-Abelian property
of the quasiparticle excitations at 5/2 filling expressed in multiple
interferometers.
