Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths

Understand

Decoherence of electron spins in nanoscale systems is important to quantum technologies such as quantum information processing and magnetometry.

• It is also an ideal model problem for studying the crossover between quantum and classical phenomena.
• At low temperatures or in light-element materials where the spin-orbit coupling is weak, the phonon scattering in nanostructures is less important and the fluctuations of nuclear spins become the dominant decoherence mechanism for electron spins.
• Since 1950s, semiclassical noise theories have been developed for understanding electron spin decoherence.