e/3 Laughlin quasiparticle primary-filling nu=1/3 interferometer.

We report experimental realization of a quasiparticle interferometer where the entire system is in 1=3 primary fractional quantum Hall state. The interferometer consists of chiral edge channels coupled by quantum-coherent tunneling in two constrictions, thus enclosing an Aharonov-Bohm area. We observe magnetic flux and charge periods h=e and e=3, equivalent to the creation of one quasielectron in the island. Quantum theory predicts a 3h=e flux period for charge e=3, integer statistics particles. Thus, the observed periods demonstrate the anyonic braiding statistics of Laughlin quasiparticles.