Quantum materials, governed by quantum mechanics principles, show exotic behaviors like superconductivity. A team at MIT led by Mingda Li has developed a precise method to adjust quantum materials' characteristics, exemplified by Weyl semimetals like TaP crystals. By adding negative hydrogen ions through doping, they fine-tuned the Fermi level to coincide with Weyl nodes' energy, optimizing the material's quantum properties. The use of an advanced ion accelerator with hydrogen ions provided unprecedented precision, setting the Fermi level accurately and enabling doping of bulk crystals. The process involved bombarding the sample to reach the desired Fermi level. Challenges included measuring the level within the accelerator chamber. The new method enhances the efficiency of tuning quantum materials, offering promising advancements in the field of materials science and quantum technology.