Researchers have made a breakthrough in optimizing g-tensor values in Ge/SiGe quantum dots, a crucial step towards scalable semiconductor-based quantum computing. The g-tensor plays a significant role in determining the energy levels and spin quantization axis of hole-spin qubits, and its control can help mitigate device performance issues caused by quantum dot variability. By tailoring the g-tensor, scientists can reduce uncertainty in qubit energy levels and random spin axis orientations, paving the way for more reliable and efficient quantum computing. This advancement is particularly important for planar germanium heterostructures, which are among the leading platforms for quantum computing1. The ability to control the g-tensor can have a significant impact on the development of quantum computers, ultimately affecting the security of cryptographic systems. So what matters to practitioners is that this breakthrough brings quantum computing one step closer to reality, threatening to upend traditional cryptography and computation methods.