| Autor: |
Hsiao, Tzu-Kan, Rubino, Antonio, Chung, Yousun, Son, Seok-Kyun, Hou, Hangtian, Pedrós, Jorge, Nasir, Ateeq, Éthier-Majcher, Gabriel, Stanley, Megan J., Phillips, Richard T., Mitchell, Thomas A., Griffiths, Jonathan P., Farrer, Ian, Ritchie, David A., Ford, Christopher J. B. |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Nature Communications 11, 917 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41467-020-14560-1 |
| Popis: |
Single-photon sources are essential building blocks in quantum photonic networks, where quantum-mechanical properties of photons are utilised to achieve quantum technologies such as quantum cryptography and quantum computing. Most conventional solid-state single-photon sources are based on single emitters such as self-assembled quantum dots, which are created at random locations and require spectral filtering. These issues hinder the integration of a single-photon source into a scaleable photonic quantum network for applications such as on-chip photonic quantum processors. In this work, using only regular lithography techniques on a conventional GaAs quantum well, we realise an electrically triggered single-photon source with a GHz repetition rate and without the need for spectral filtering. In this device, a single electron is carried in the potential minimum of a surface acoustic wave (SAW) and is transported to a region of holes to form an exciton. The exciton then decays and creates a single photon in a lifetime of ~ 100ps. This SAW-driven electroluminescence (EL) yields photon antibunching with $g^{(2)}(0) = 0.39 \pm 0.05$, which satisfies the common criterion for a single-photon source $g^{(2)}(0) < 0.5$. Furthermore, we estimate that if a photon detector receives a SAW-driven EL signal within one SAW period, this signal has a 79%-90% chance of being a single photon. This work shows that a single-photon source can be made by combining single-electron transport and a lateral n-i-p junction. This approach makes it possible to create multiple synchronised single-photon sources at chosen positions with photon energy determined by quantum-well thickness. Compared with conventional quantum-dot-based single-photon sources, this device may be more suitable for an on-chip integrated photonic quantum network. |
| Databáze: |
arXiv |
| Externí odkaz: |
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