Bright ideas accelerate the hunt for quantum emitters

Researchers from the University of Osaka have developed a fast prediction method to identify promising quantum materials for future technologies. Traditional evaluations of quantum materials' efficiency involve computationally demanding simulations, hindering the screening of numerous candidates. The new method uses a high-speed first-principles framework that simplifies the calculations required to evaluate optical processes, making material searches more practical.

The framework focuses on atomic-scale color centers, which can emit single photons and store quantum information, making them valuable for quantum technologies like communication, sensing, and computing. By deriving a compact theoretical formula for optical losses caused by nonradiative processes, the researchers streamlined the calculation and achieved excellent agreement with conventional methods, despite using fewer expensive computations.

The method proved effective in screening color centers within silicon carbide, a leading platform for quantum technologies. The team identified several promising spin-qubit candidates based on their high spin and confirmed emitters that had already been experimentally demonstrated. The prediction method is not limited to a specific material system, allowing its application across various semiconductors and spectral ranges, from ultraviolet to telecommunication wavelengths.

By rapidly identifying bright, efficient quantum emitters while considering both light emission and optical losses, this framework could significantly accelerate the discovery of materials for quantum communication, sensing, and computing technologies, bringing practical quantum devices closer to reality.