Loschmidt echo in many-spin systems: a quest for intrinsic decoherence and emergent irreversibility
Loschmidt echo in many-spin systems: a quest for intrinsic decoherence and emergent irreversibility
If a magnetic polarization excess is locally injected in a crystal of interacting spins, this "excitation" would spread as consequence of spin-spin interactions. Such an apparently irreversible process is known as spin diffusion and it can lead the system back to "equilibrium". Even so, a unitary quantum dynamics would ensure …