Temporal shaping of single photons by engineering exciton dynamics in a single quantum dot
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- Kyu-Young Kim
- Department of Physics, Ulsan National Institute of Science and Technology 1 , Ulsan 44919, Republic of Korea
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- Christopher J. K. Richardson
- Laboratory for Physical Sciences, University of Maryland 2 , College Park, Maryland 20740, USA
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- Edo Waks
- Department of Electrical and Computer Engineering and Institute for Research in Electronics and Applied Physics, University of Maryland 3 , College Park, Maryland 20742, USA
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- Je-Hyung Kim
- Department of Physics, Ulsan National Institute of Science and Technology 1 , Ulsan 44919, Republic of Korea
抄録
<jats:p>The majority of photonic quantum information technologies rely on single photons that have high purity and indistinguishability. Although solid-state quantum emitters can serve such single photons on demand, their asymmetric temporal and spatial mode profiles limit the optimal efficiency and fidelity of quantum interaction. Here, we demonstrate single-photon pulses at a telecom wavelength with a Gaussian-like temporal mode profile from a cavity-coupled single quantum dot. Engineering the exciton dynamics via multi-exciton cascade recombination and cavity detuning enables us to modify the rise and decay dynamics of single excitons. Furthermore, the cascade recombination process temporally retards the single-exciton emission from the background emission, leading to possible purification of single photons at high excitation power. In addition, coupling quantum dots into a low Q cavity mode leads to a Gaussian-like spatial mode profile, which brings a high collection efficiency. This approach paves the way for producing single photons with an optimized temporal and spatial waveform.</jats:p>
収録刊行物
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- APL Photonics
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APL Photonics 6 (8), 2021-08-01
AIP Publishing