All-Optical Depletion of Dark Excitons from a Semiconductor Quantum Dot

Abstract

Semiconductor quantum dots are considered to be the leading venue for fabricating on-demand sources of single photons. However, the generation of long-lived dark excitons imposes significant limits on the efficiency of these sources. We demonstrate a technique that optically pumps the dark exciton population and converts it to a bright exciton population, using intermediate excited biexciton states. We show experimentally that our method considerably reduces the DE population while doubling the triggered bright exciton emission, approaching thereby near-unit fidelity of quantum dot depletion.

5 pages, 3 figures

References in corpus (8)

• The Quantum Internet
• Quantum Computing
• Entangled Photon Pairs from Semiconductor Quantum Dots
• Resonance fluorescence from a coherently driven semiconductor quantum dot in a cavity
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
• Polarization sensitive spectroscopy of charged Quantum Dots
• Complete control of a matter qubit using a single picosecond laser pulse
• Determinstic Generation of a Quantum Dot-Confined Triexciton and its Radiative Decay via Three-Photon Cascade

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