Overview

• Researchers reported in Science that they created entanglement between the nuclear spins of two phosphorus atoms in a silicon device using electrons as mediators.
• They implemented a controlled-Z operation via a geometric gate, linking nuclei separated by about 20 nanometers—comparable to modern transistor features.
• The team measured a nuclear Bell state with roughly 76% fidelity and a concurrence of about 0.67, confirming entanglement quality.
• Engineers describe the approach as robust and scalable, noting electrons can be repositioned or reshaped to switch interactions with precision.
• The device used phosphorus implanted by the University of Melbourne in ultrapure silicon supplied by Keio University, underscoring compatibility with established semiconductor processes.