Detection of photogenerated single electrons in a lateral quantum dot with a surface plasmon antenna. (9th November 2021)

• Record Type: Journal Article
• Authors: Fukai, Rio; Sakai, Yuji; Fujita, Takafumi; Kiyama, Haruki; Ludwig, Arne; Wieck, Andreas D.; Oiwa, Akira
• Is Part Of: Applied physics express. Volume 14:Number 12(2021)
• Publication Date: 2021-11-09
• Subjects: quantum dot -- surface plasmon antenna -- single photoelectron detection; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/ac336d
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: Electron spins in gate-defined lateral quantum dots (QDs) are a suitable platform for qubits and have the capacity for coherent coupling to free-space photons. Superposition state transfer from single photon polarizations to single spins has been realized using a GaAs gate-defined QD. However, its efficiency is limited by the small size of the QDs. Here, we use a surface plasmon antenna on a GaAs gate-defined QD and demonstrate that the photoelectron detection probability is enhanced by 5.3–9.2 times. This result contributes to the development of photon–spin quantum interface using gate-defined lateral QDs.