Abstract
In three spatial dimensions, there are only two possible types of statistics
dividing particles into two groups: bosons and fermions. If one is restricted
to two-dimensional systems the situation changes drastically. There, anyons can
appear, which exhibit fractional statistics ranging continuously from bosonic
to fermionic. Anyons are responsible for the fractional quantum Hall effect and
should be realized as quasiparticles in highly entangled many-body systems.
However, the continuing presence of interactions makes anyons quite elusive.
Here, as an alternative approach, we encode the relevant many-body state of an
anyonic model in the multi-partite entangled state of polarized photons. This
quantum system is intrinsically stable against decoherence. It enables easy
manipulation and detection of abelian anyons, allows for the demonstration of
their fusion rules and facilitates the unambiguous determination of their
statistical properties. The experiments directly demonstrate the presence of
fractional statistics in a physical system.
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