



01205nas a2200145   4500008004100000245007600041210006900117260001500186490000700201520076300208100001500971700001900986700001701005856003701022       2013                        eng d00aIndividual Addressing in Quantum Computation through Spatial Refocusing0 aIndividual Addressing in Quantum Computation through Spatial Ref  c2013/11/210 v883 a  Separate addressing of individual qubits is a challenging requirement for
scalable quantum computation, and crosstalk between operations on neighboring
qubits remains as a significant source of noise for current experimental
implementation of multi-qubit platforms. We propose a scheme based on spatial
refocusing from interference of several coherent laser beams to significantly
reduce the crosstalk noise for any type of quantum gates. A general framework
is developed for the spatial refocusing technique, in particular with practical
Gaussian beams, and we show under typical experimental conditions, the
crosstalk-induced infidelity of quantum gates can be reduced by several orders
of magnitude with a moderate cost of a few correction laser beams.
1 aShen, Chao1 aGong, Zhe-Xuan1 aDuan, Luming  uhttp://arxiv.org/abs/1305.2798v3