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Electron-electron interactions play a major role in determining thelow-temperature rate of phase loss of electrons in mesoscopic systems. Thestudy of the dephasing rate is expected to contribute to the understanding ofthe many-body nature of such systems. Closed quantum dots are of specialinterest in this respect, due to theoretical predictions suggesting a possibletransition temperature below which the dephasing rate vanishes. This predictionhas attracted much attention, since closed quantum dots are prime candidatesfor storage units in quantum computers, and thus their phase coherenceproperties are of great importance. However, an effective method for measuringthe dephasing rate within a closed quantum dot is still lacking. Here we studytwo-level systems and show that the Fano factor has a sharp peak as a functionof the chemical potential, the location of which can be simply related to thedephasing rate. We thus suggest to use the properties of the Fano factor peakin the super-Poissonian regime as a probe for the dephasing rate.

Super-Poissonian Shot Noise as a Measure of Dephasing in Closed Quantum Dots