Promises of Semiconductor Quantum Dots in Quantum Technologies

Promises of Semiconductor Quantum Dots in Quantum Technologies

Title of the project: Semiconductor quantum dots for photonic quantum computing
Name of the VDSP student(s) & image credits: Lena Hansen, Lennart Jehle & Marco Di Vita
Project supervised by: Philip Walther & Juan Loredo

About me/us: During the Ph.D. project in the Walther group, I will explore the use ofsemiconductor quantum dots in photonic quantum computing.

Image: Photonic platforms in which single photons act as qubits are promising to realize large-scale quantum computing due to the mature approaches for fully integrated devices. However, the fact that photons do not interact easily is a challenge in creating multi-photon gates, such as entanglement operations for fusion-based quantum computing. To address this challenge, researchers have enhanced linear-optic entanglement protocols and investigate mediators for photon-photon interactions to generate highfidelity entangled states. A promising platform for these tasks are quantum dots. Many non-linear effects in the light-matter and mediated light-light interaction were investigated, such as single-photon filtering, photonnumber state sorting, and photon-photon interaction mediated by a quantum emitter, as well as coupling dynamics of two distant emitters. The picture shows the vision of the integration of semiconductor quantum dots into circuits for photonic quantum computing.