ENGINEERING TARGETED QUANTUM CHARACTERISTIC IN SIC-BASED MATERIALS
Abstract
We investigate systems to realize spin qubits in silicon carbide (SiC), a technologically mature host material, where several point defects have been predicted and demonstrated to yield a solid-state quantum coherent material with singly-addressable spin states. In the past three years we developed theoretical and computational tools based on first principles calculations, which we coupled to quantum coherence measurements on samples characterized at the atomic scale, and we predicted and studied several quantum functionalities of SiC for applications ranging from quantum sensing to quantum communication. The results obtained so far led to the design principles of this proposal: we will pursue spin-charge conversion (SCC) for single-shot electrical read-out of qubit states and the realization of the process using multiple defect platforms. Deterministic readout of the spin state and long coherence times are necessary for heralded entanglement generation, high gate fidelities, and the development of network components, e.g. quantum repeaters. Given the CMOS compatibility of SiC, single-shot electrical read-out will pave the way to the integration of electron spin–based systems in classical electrical devices that are sensitive to single charges. In addition, we will combine our existing capabilities of addressing individual weakly-coupled nuclear spins and SCC process to perform high-fidelity readout of nuclear spin states, and we will use strain and nanostructuring to realize and optimize desired coherent states in SiC. This is a five year program that requires atomic scale characterization of defects to precisely determine their position; the development of first principles capabilities to predict SCC processes, including ionization and stimulated emission, and the influence on strain and nanostructuring on coherence times; and finally the experimental realization of spin qubit-integrated avalanche photodiodes for single shot-electrical read-out.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210370
Entities
People
- Giulia Galli
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Chicago