First nuclear spins' optical control/ detection within a molecular crystal replaces bulky, interference-prone quantum systems

https://www.eurekalert.org/news-releases/1123330

"nuclear magnetic resonance uses radio waves to manipulate spins, but difficult to scale down to individual qubits... overcome using molecular crystal containing europium ions having narrow optical transitions, acting like high-precision tunnels allowing laser light to reach nucleus directly... using high-frequency fields shielding molecules, 2 ms coherence lifetime enough to perform complex calculations...  and suggests these molecular spins are exceptionally stable and protected from their surroundings. scalability, atomic precision, high density... stable, molecular-scale qubit registers"