Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interference measurements of non-Abelian e/4 & Abelian e/2 quasiparticle
  braiding   The quantum Hall states at filling factors $\nu=5/2$ and $7/2$ are expected
to have Abelian charge $e/2$ quasiparticles and non-Abelian charge $e/4$
quasiparticles. For the first time we report experimental evidence for the
non-Abelian nature of excitations at $\nu=7/2$ and examine the fermion parity,
a topological quantum number of an even number of non-Abelian quasiparticles,
by measuring resistance oscillations as a function of magnetic field in
Fabry-P\'erot interferometers using new high purity heterostructures. The phase
of observed $e/4$ oscillations is reproducible and stable over long times
(hours) near $\nu=5/2$ and $7/2$, indicating stability of the fermion parity.
When phase fluctuations are observed, they are predominantly $\pi$ phase flips,
consistent with fermion parity change. We also examine lower-frequency
oscillations attributable to Abelian interference processes in both states.
Taken together, these results constitute new evidence for the non-Abelian
nature of $e/4$ quasiparticles; the observed life-time of their combined
fermion parity further strengthens the case for their utility for topological
quantum computation.

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The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg