A non-equilibrium distribution of electrons is set up when two quantum Hall edge states originating from sources at different potentials meet at a quantum point contact. Recently, several types of experiment have probed the consequences of this non-equilibrium distribution, first in interferometers, and recently by a direct measurement of the distribution and its evolution with distance downstream from the quantum point contact . In this talk I will describe theoretical work  aimed at understanding aspects of these experiments. References  H. le Sueur, C. Altimiras, U. Gennser, A. Cavanna, D. Mailly, F. Pierre, Phys. Rev. Lett. 105, 056803 (2010).  D. L. Kovrizhin and J. T. Chalker, arXiv:1009.4555, and in preparation.
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