Keeping the photon in the dark: Enabling full quantum dot control by chirped pulses and magnetic fields
arxiv(2024)
摘要
Because dark excitons in quantum dots are not directly optically accessible,
so far they have not played a significant role in using quantum dots for photon
generation. They possess significantly longer lifetimes than their brighter
counterparts and hence offer enormous potential for photon storage or
manipulation. In this work, we demonstrate an all-optical storage and retrieval
of the spin-forbidden dark exciton in a quantum dot from the ground state
employing chirped pulses and an in-plane magnetic field. Our experimental
findings are in excellent agreement with theoretical predictions of the
dynamics calculated using state-of-the-art product tensor methods. Our scheme
enables an all-optical control of dark states without relying on any preceding
decays. This opens up a new dimension for optimal quantum control and time-bin
entangled photon pair generation from quantum dots.
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