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Improving the lifetime of the nitrogen-vacancy-center ensemble coupled with a superconducting flux qubit by applying magnetic fields
One of the promising systems to realize quantum computation is a hybrid system where a superconducting flux qubit plays the role of a quantum processor and the nitrogen-vacancy- $({\mathrm{NV}}^{\ensuremath{-}})$ center ensemble is used as a quantum memory. We have theoretically and experimentally studied the effect of magnetic fields on this …