Detection of photogenerated single electrons in a lateral quantum dot with a surface plasmon antenna

Fukai, R. and Sakai, Y. and Fujita, T. and Kiyama, H. and Ludwig, Ar. and Wieck, A.D. and Oiwa, A.

Volume: 14 Pages:
DOI: 10.35848/1882-0786/ac336d
Published: 2021

Electron spins in gate-defined lateral quantum dots (QDs) are a suitable platform for qubits and have the capacity for coherent coupling to freespace 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. © 2021 The Japan Society of Applied Physics.

« back