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A pair of coupled dots with one electron in each dot can provide improvementsin spin coherence, particularly at an electrical bias called the sweet spot,but few measurements have been performed on self-assembled dots in this regime.Here, we directly measure the $T_2^*$ coherence time of the singlet-tripletstates in this system as a function of bias and magnetic field, obtaining amaximum $T_2^*$ of 60 ns, more than an order of magnitude higher than anelectron spin in a single quantum dot. Our results uncover two main dephasingmechanisms: electrical noise away from the sweet spot, and a magnetic fielddependent interaction with nuclear spins due to a difference in g-factors.

Enhanced spin coherence at the sweet spot of a self-assembled quantum dot molecule