An investigation of the antiferromagnet-based NMR quantumregister in inhomogeneous magnetic field

摘要

It is given the refinements and further development of NMR model of quantum register based on easy-axisnuclear spin-free antiferromagnet, which was presented previously in paper.' The model suggests that externalmagnetic field is directed along the easy axis, normally to the plate surface and has a weak constant gradientalong the nuclear spin chain of quantum register.In present paper it is evaluated the general expression for indirect coupling between nuclear spins due tohyperfine nuclear-electron coupling in substituted atoms and spin-wave propagation in antiferromagnet close tocritical point of quantum phase transition in antiferromagnet of spin-flop type. It is given also an estimationof quantum states decoherence rate, which is caused by the interaction of nuclear spins with spin waves inantiferromagnet.