Grant: Alliance Grants

Quantum bit (qubit) is the basic building block of quantum science and information processing. The ability to generate, process and store qubits establish the foundation for quantum information science and technologies. Among the various approaches, semiconductor quantum dots (QDs) have emerged as a viable technique for storing quantum information as qubit. Isolated electron spins have robust coherence; therefore, they are promising qubit candidate for a solid-state quantum system. Electron spins can be isolated using a gate-defined or heterostructure quantum dots in semiconductors. The projects aim to experimentally demonstrate a viable spin-spin controlled phase (CZ) gate between two laterally positioned InGaN quantum dot single photon emitters. The proposed scheme will enable the gate operation by the Coulomb interaction that only couples the two dots when both dots are in their excited trion states. Capitalizing on the unique properties of InGaN including highly confined electron and hole wavefunctions, lower dielectric constant of the quantum dot matrix and strong polarization, the project aims to demonstrate significantly enhanced coupling. The proposed two-qubit gate will be crucial to enable more versatile quantum computational functionalities, e.g., entanglement swapping in a quantum link and generation of large-scale entangled cluster state. The project will be led by Dr. Sharif Sadaf (INRS) and Dr. Pei-Cheng Ku (University of Michigan, Ann Arbor).