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We demonstrate the suppression of nuclear spin fluctuations in an InAsquantum dot and measure the timescales of the spin narrowing effect. Byinitializing for tens of milliseconds with two continuous wave diode lasers,fluctuations of the nuclear spins are suppressed via the hole assisted dynamicnuclear polarization feedback mechanism. The fluctuation narrowed statepersists in the dark (absent light illumination) for well over one second evenin the presence of a varying electron charge and spin polarization. Enhancementof the electron spin coherence time (T2*) is directly measured using coherentdark state spectroscopy. By separating the calming of the nuclear spins in timefrom the spin qubit operations, this method is much simpler than the spin echocoherence recovery or dynamic decoupling schemes.

Persistent narrowing of nuclear-spin fluctuations in InAs quantum dots using laser excitation