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The effect of an invasive voltage probe on the phase-coherent conductionthrough a ballistic chaotic cavity is investigated by random-matrix theory. Theentire distribution P(G) of the conductance G is computed for the case that thecavity is coupled to source and drain by two point contacts with a quantizedconductance of 2 e^2/h, both in the presence (beta = 1) and absence (beta = 2)of time-reversal symmetry. The loss of phase-coherence induced by the voltageprobe causes a crossover from P(G) ~ G^(-1 + beta/2) to a Gaussian centered atG = e^2/h with a beta-dependent width. ***Submitted to Physical Review B.***Comment: 9 pages, REVTeX-3.0, 4 postscript figures appended as self-extracting  archive, INLO-PUB-941020

Effect of a voltage probe on the phase-coherent conductance of a ballistic chaotic cavity