We construct optimized implementations of the CNOT and other universal two-qubit gates that, unlike many of the previously proposed protocols, are carried out in a single step. The new protocols require tunable inter-qubit couplings but, in return, show a significant improvements in the quality of gate operations. Our optimization procedure can be further extended to the combinations of elementary two-qubit as well as irreducible many-qubit gates.
@article{arxiv.quant-ph/0412084,
title = {Optimized design of universal two-qubit gates},
author = {I. A. Grigorenko and D. V. Khveshchenko},
journal= {arXiv preprint arXiv:quant-ph/0412084},
year = {2013}
}