A direct measurement of the trion relaxation and dipole decoherence rate: An application of high resolution coherent nonlinear optical spectroscopy

Coherent nonlinear optical spectroscopy of single electron quantum dots allows us to measure the decay and decoherence times of the charged exciton (trion) state. Our results show that the decoherence time of QD trions is not significantly affected by pure dephasing processes, which are suppressed by the zero-dimensional nature of the orbital states of the QD.