Colloquium: Photon-electron spin quantum interface based on gate-defined quantum dots

ABSTRACT

Information technologies based on quantum mechanical principle are expected to provide ultimate processing schemes. After a brief introduction of quantum information processing, I will present the basic concept and developments of quantum information processing using electron spins in gate-defined quantum dots. The manipulation and detection of single electron spins in gate-defined QDs have been studied as a platform of qubits. We are investigating the quantum communications using photon-electron spin quantum interface (Poincaré interface) based on quantum dots (QDs). The gate-defined QDs have a great potential of the quantum interface between photons and spins in solids [1]. The ingredient technologies are quantum state conversion from single photons to single electron spins and the entanglement conversion from photon pairs to electron spin pairs. In this talk, I present the recent experimental progresses on the quantum state conversion in a gate-defined QD [2,3] and the coincidence measurement between single photo-electron detection in a QD and single photon detection using an entangled photon source [4] Moreover the recent progresses on the enhancement of the coupling between photons and electron spins in QDs and future prospects are discussed.

References 

[1] A. Oiwa et al., J. Phys. Soc. Jpn. 86, 011008 (2017).

[2] T. Fujita et al., arXiv:1504. 03696.

[3] K. Kuroyama et al., Phys. Rev. B 99, 085203 (2019).

[4] K. Kuroyama et al., Sci. Rep. 7, 16968 (2017).

BIOGRAPHY

Prof Akira Oiwa is the leader of the Quantum Systems Electronics Group at the University of Osaka, Japan. He specializes in phenomena related to Quantum Information/ Quantum computing such as: Quantum Transport, Spin phenomena and Topological effects. His particular expertise focuses on the photon to spin quantum interface coupling light-based quantum information systems to electron-based systems.