Purification of Single Photons by Temporal Heralding of Quantum Dot Sources
- Hebrew Univ. of Jerusalem (Israel)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Efficient, high rate photon sources with high single-photon purity are essential ingredients for quantum technologies. Single-photon sources based on solid state emitters such as quantum dots are very advantageous for integrated photonic circuits, but they can suffer from a high two-photon emission probability, which in cases of noncryogenic environment cannot be spectrally filtered. Here we propose two temporal purification-by-heralding methods for using a two-photon emission process to yield highly pure and efficient single-photon emission, bypassing the inherent problem of spectrally overlapping biphoton emission at elevated temperatures. We experimentally emulate their feasibility on the emission from a single nanocrystal quantum dot at room temperature, exhibiting single-photon purities exceeding 99.5%, without a significant loss of single-photon efficiency. By utilizing these methods with commercially available components, nanocrystal quantum dots can be made realistic high-quality room-temperature sources for single photons. In conclusion, these approaches can also be applied for any indeterministic source of spectrally broadband photon pairs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- 89233218CNA000001; AC52-06NA25396; NA0003525
- OSTI ID:
- 1570655
- Alternate ID(s):
- OSTI ID: 1673360
- Report Number(s):
- LA-UR--18-28801; LA-UR--19-29784
- Journal Information:
- ACS Photonics, Journal Name: ACS Photonics Journal Issue: 2 Vol. 6; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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