document: Implementation of universal quantum gates based on nonadiabatic geometric phases We propose an experimentally feasible scheme to achieve quantum computation based on nonadiabatic geometric phase shifts , in which a cyclic geometric phase is used to realize a set of universal quantum gates . Physical implementation of this set of gates is designed for Josephson junctions and for NMR systems . Interestingly , we find that the nonadiabatic phase shift may be independent of the operation time under appropriate controllable conditions . A remarkable feature of the present nonadiabatic geometric gates is that there is no intrinsic limitation on the operation time
doc_bio_tags: O O B I I O O O O O O O O O O O O O B I O O B I I I O O O O B I I O O O O O O O B I I O O O O O O O O O O O B I O O B I O O O O O O O B I I O O O O O B I O O O O O O O O O O O B I I O O O O O O O O O B I
extractive_keyphrases: quantum computation nonadiabatic geometric phase shifts cyclic geometric phase universal quantum gates josephson junctions nmr systems nonadiabatic phase shift operation time nonadiabatic geometric gates