Single-photon superradiance from a quantum dot

Abstract

We report on the observation of single-photon superradiance from an exciton in a semiconductor quantum dot. The confinement by the quantum dot is strong enough for it to mimic a two-level atom, yet sufficiently weak to ensure superradiance. The electrostatic interaction between the electron and the hole comprising the exciton gives rise to an anharmonic spectrum, which we exploit to prepare the superradiant quantum state deterministically with a laser pulse. We observe a five-fold enhancement of the oscillator strength compared to conventional quantum dots. The enhancement is limited by the base temperature of our cryostat and may lead to oscillator strengths above 1000 from a single quantum emitter at optical frequencies.

15 pages, 11 figures

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• Second-order photon correlation measurement with picosecond resolution
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• Decoherence by spontaneous emission: a single-atom analog of superradiance
• Plasmonic Superradiance of Two Emitters Near Metal Nanorod
• Deterministic fabrication of GaAs-quantum-dot micropillar single-photon sources
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• Superradiant active optical atomic clocks: motivations and current challenges