title: Protected quantum computing: interleaving gate operations with dynamical decoupling sequences.
abstract: Implementing precise operations on quantum systems is one of the biggest challenges for building quantum devices in a noisy environment. Dynamical decoupling attenuates the destructive effect of the environmental noise, but so far, it has been used primarily in the context of quantum memories. Here, we experimentally demonstrate a general scheme for combining dynamical decoupling with quantum logical gate operations using the example of an electron-spin qubit of a single nitrogen-vacancy center in diamond. We achieve process fidelities >98% for gate times that are 2 orders of magnitude longer than the unprotected dephasing time T2.
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
authors.forename: Jingfu
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, Rio de Janeiro 22290-180, RJ, Brazil.
authors.forename: Alexandre M
authors.initials: AM
authors.lastname: Souza
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
authors.forename: Frederico Dias
authors.initials: FD
authors.lastname: Brandao
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
authors.forename: Dieter
authors.initials: D
authors.lastname: Suter