Topic: silicon

Fault-tolerant computation usually builds an error-correctable logical qubit by entangling several physical qubits. Even when it represents one quantum bit, this logical object occupies a higher-dimensional space. Andrea Morello discusses a different approach that stores quantum information directly in a naturally high-dimensional physical system. The system uses an antimony nucleus with spin I = 7/2 and an eight-dimensional Hilbert space. As a group-V donor, the atom can be implanted into a silicon nanoelectronic device. Its nuclear spin supports Schrödinger-cat states that serve as logical