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We study the conductance statistical features of ballistic electrons flowingthrough a chaotic quantum dot. We show how the temperature affects theuniversal conductance fluctuations by analyzing the influence of dephasing andthermal smearing. This leads us to two main findings. First, we show that theenergy correlations in the transmission, which were overlooked so far, areimportant for calculating the variance and higher moments of the conductance.Second, we show that there is an ambiguity in the method of determination ofthe dephasing rate from the size of the of the weak localization. We find thatthe dephasing times obtained at low temperatures from quantum dots areunderestimated.Comment: 4 pages, 4 figures, to appear in Phys. Rev. Let

Conductance Fluctuations and Weak Localization in Chaotic Quantum Dots