Quantum computers: a "spin-in-diamond" quadbit processor reaches a record error rate of 0.001%

By combining ultra-pure diamond and spin control with the atomic scale, QuTech and Fujitsu crossed an unprecedented threshold in quantum calculation: an error rate of only 0.001%. This significantly reduced error rate was obtained using diamonds with a particular atomic configuration and complex design grids. This progress represents a significant progress towards reducing quantum computer computational errors. By exploiting quantum mechanics pr…