NMR Quantum Automata in Doped Crystals
Haiqing Wei, Xin Xue, S. D. Morgera
Abstract
In a lattice L of nuclear spins with ABCABCABC... type periodic structure embedded in a single-crystal solid, each ABC-unit can be used to store quantum information and the information can be moved around via some cellular shifting mechanism. Impurity doping marks a special site D∈ L which together with the local spin lattice constitute a quantum automaton where the D site serves as the input/output port and universal quantum logic is done through two-body interactions between two spins at D and a nearby site. The novel NMR quantum computer can be easily scaled up and may work at low temperature to overcome the problem of exponential decay in signal-to-noise ratio in room temperature NMR.
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