Non-Equilibrium Quantum Noise in the Fractional Quantum Hall Effect:
Listening to Fractional Charge

The low energy excitations of fractional quantum Hall (FQH) liquids carry fractional quantum numbers such as charge and statistics. This directly affects the noise spectrum of the FQH current, and, conversely, the noise data provides direct evidence for fractional quantum numbers. In this talk, I will show in detail how the mesurement of shot noise can generally be used as a powerful tool to study the nature of the fractionally charged FQH quasiparticles. Recently, this tool has been succesfully used in the first transport observations of fractional charge by two experimental groups, one in Saclay and the other at the Weizmann Institute. I will also discuss a device which could allow for the direct observation of fractional statistics.