Quantum fluctuations of the Coulomb blockade are investigated as a function
of the coupling to reservoirs in semiconductor quantum dots. We use fluctu
ations in the distance between peaks Delta N apart to characterize both the
amplitude and correlation of peak motion. For strong coupling, the peak mo
tion is greatly enhanced at low temperature, but does not show the expected
increase in peak-to-peak correlation. These effects can lead to anomalous
temperature dependence in the Coulomb valleys, similar to the behavior ascr
ibed to Kondo physics.