Journal
NATURE NANOTECHNOLOGY
Volume 12, Issue 11, Pages 1026-1039Publisher
NATURE PORTFOLIO
DOI: 10.1038/NNANO.2017.218
Keywords
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Funding
- ERC [277885 QD-CQED]
- Australian Research Centres of Excellence for Engineered Quantum Systems [CE110001013]
- Quantum Computing and Communication Technology [CE110001027]
- PFC@JQI
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430094] Funding Source: National Science Foundation
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Single photons are a fundamental element of most quantum optical technologies. The ideal single-photon source is an on-demand, deterministic, single-photon source delivering light pulses in a well-defined polarization and spatiotemporal mode, and containing exactly one photon. In addition, for many applications, there is a quantum advantage if the single photons are indistinguishable in all their degrees of freedom. Single-photon sources based on parametric down-conversion are currently used, and while excellent in many ways, scaling to large quantum optical systems remains challenging. In 2000, semiconductor quantum dots were shown to emit single photons, opening a path towards integrated single-photon sources. Here, we review the progress achieved in the past few years, and discuss remaining challenges. The latest quantum dot-based single-photon sources are edging closer to the ideal single-photon source, and have opened new possibilities for quantum technologies.
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