Temporal shaping of single photons by engineering exciton dynamics in a single quantum dot
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2021
- Source ID
- 10.1063/5.0045241
Entities
People
- Christopher J K Richardson
- Edo Waks
- Je-Hyung Kim
- Kyu-young Kim
Organizations
- Air Force Office of Scientific Research
- Korea Institute of Science and Technology
- National Research Foundation of Korea
- Ulsan National Institute of Science and Technology
- University of Maryland