NMR Quantum Automata in Doped Crystals

TL;DR

This paper proposes a scalable NMR quantum automaton in doped crystals, utilizing impurity sites as input/output ports for universal quantum logic, potentially operating at low temperatures to mitigate signal decay.

Contribution

It introduces a novel NMR quantum computing architecture based on doped crystals with impurity sites serving as quantum automata input/output ports.

Findings

The proposed system enables universal quantum logic via two-body interactions.

It can be scaled up easily and operates effectively at low temperatures.

The architecture addresses signal decay issues in room-temperature NMR.

Abstract

In a lattice ${\cal L}$ 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$\not\in{\cal L}$ 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.