Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode.,Nature Communications

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Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode.
Nature Communications ( IF 14.7 ) Pub Date : 2020-02-14 , DOI: 10.1038/s41467-020-14560-1
Tzu-Kan Hsiao _{1,

2} , Antonio Rubino _{1,

3} , Yousun Chung _{1,

4} , Seok-Kyun Son _{1,

5} , Hangtian Hou ₁ , Jorge Pedrós _{1,

6} , Ateeq Nasir _{1,

7} , Gabriel Éthier-Majcher ₁ , Megan J Stanley _{1,

8} , Richard T Phillips ₁ , Thomas A Mitchell ₁ , Jonathan P Griffiths ₁ , Ian Farrer _{1,

9} , David A Ritchie ₁ , Christopher J B Ford ₁

Affiliation

The long-distance quantum transfer between electron-spin qubits in semiconductors is important for realising large-scale quantum computing circuits. Electron-spin to photon-polarisation conversion is a promising technology for achieving free-space or fibre-coupled quantum transfer. In this work, using only regular lithography techniques on a conventional 15 nm GaAs quantum well, we demonstrate acoustically-driven generation of single photons from single electrons, without the need for a self-assembled quantum dot. In this device, a single electron is carried in a 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 optical photon within 100 ps. This SAW-driven electroluminescence, without optimisation, yields photon antibunching with g(2)(0) = 0.39 ± 0.05 in the single-electron limit (g(2)(0) = 0.63 ± 0.03 in the raw histogram). Our work marks the first step towards electron-to-photon (spin-to-polarisation) qubit conversion for scaleable quantum computing architectures.

中文翻译：

SAW驱动的横向发光二极管中单电子传输的单光子发射。

半导体中电子自旋量子位之间的长距离量子转移对于实现大规模量子计算电路很重要。电子自旋到光子极化的转换是一种实现自由空间或光纤耦合量子转移的有前途的技术。在这项工作中，仅使用常规的15 nm GaAs量子阱上的常规光刻技术，我们就证明了声驱动的单电子产生单光子，而无需自组装量子点。在该装置中，单个电子被携带在表面声波（SAW）的最小电势中，并被传输到空穴区域以形成激子。激子然后衰减并在100 ps内产生单个光学光子。未经优化的SAW驱动的电致发光会产生g（2）（0）= 0的光子反聚束。单电子极限为39±0.05（原始直方图中的g（2）（0）= 0.63±0.03）。我们的工作标志着可缩放量子计算体系结构朝电子到光子（自旋极化）量子位转换迈出的第一步。

更新日期：2020-02-14

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