研究目的
To demonstrate the generation of single photons from single electrons using a SAW-driven lateral n-i-p junction, marking the first step towards electron-to-photon (spin-to-polarisation) qubit conversion for scalable quantum computing architectures.
研究成果
The study successfully demonstrates the generation of single photons from single electrons using a SAW-driven lateral n-i-p junction, fabricated using a fully deterministic lithographic process. This marks the first major step towards long-distance semiconductor qubit transfer via single optical photons, with potential improvements in device performance through stronger confinement and surface passivation.
研究不足
The internal quantum efficiency is low (~2.5%), likely due to trapping and non-radiative recombination in surface states around the etched edges, or electrons being carried away without recombining near the junction. The g(2)(0) value of 0.39 is high compared to the very best self-assembled quantum dots, indicating room for improvement in achieving more well-defined single-electron states.
1：Experimental Design and Method Selection:
The experiment involves the use of a SAW-driven lateral n-i-p junction made in a conventional undoped 15 nm GaAs quantum well using standard lithography techniques. Electrons and holes are induced in regions under electron and hole surface gates, separated by an intrinsic region. A SAW is generated by applying a radio-frequency signal to an interdigitated transducer at its resonant frequency.
2：Sample Selection and Data Sources:
The device is fabricated using a deterministic conventional lithography process on a 15 nm GaAs quantum well.
3：List of Experimental Equipment and Materials:
The setup includes a confocal fibre-coupled lens assembly, a single-mode fibre, a 750 mm Czerny-Turner spectrometer with a chilled EMCCD camera, and a Hanbury Brown and Twiss setup for measuring photon antibunching.
4：Experimental Procedures and Operational Workflow:
The SAW-driven current and electroluminescence (EL) signal are measured as a function of applied RF frequency. Time-resolved EL measurements are conducted to study the dynamics of SAW-driven generation of single photons.
5：Data Analysis Methods:
The second-order correlation function g(2)(0) is measured to confirm single-photon emission. The internal quantum efficiency is calculated, and the probability distribution of photon-number states is estimated.
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