Dissipation-free quantum computing using ultrafast coherent magnonics

https://phys.org/news/2024-05-energy-efficient-quantum-magnets.html 

"generate, modulate, amplify nanoscale propagating spin waves... no electric currents so no energy losses or heat... store/ process information in waves, using electron's spins (magnets) instead of charges... to excite fast spin, trillionth of second light pulses (2, separated by short time delay variously adjusted controlling amplitude and phase)... strong absorption at UV photon energies localizing excitation in thin region few tens of nm from interface, allowing THz and sub-µm nonlinear spin waves to emerge"