Universal coherent control of interacting spins in semiconductor quantum dot four singlet–triplet qubits

https://www.nature.com/articles/s41565-024-01817-9

"2 × 4 germanium quantum dot array with full, controllable interactions between nearest-neighbour spins... 2-axis single-qubit control of each qubit, SWAP-style 2-qubit gates between all neighbouring qubit pairs, yielding 99.49(8)–99.84(1)% average single-qubit gate fidelities, 73(1)–90(1)% Bell state fidelities... circuit generates/ distributess entanglement across array... singlet–triplet qubits a competing, scalable, quantum computing platforrm... quantum information processing, quantum magnetism"

Related: Quantum dots enhance spin chemistry in radical pairs
https://phys.org/news/2025-01-quantum-dots-chemistry-radical-pairs.html