title: Optimal control of a qubit coupled to a non-Markovian environment.
abstract: A central challenge for implementing quantum computing in the solid state is decoupling the qubits from the intrinsic noise of the material. We investigate the implementation of quantum gates for a paradigmatic, non-Markovian model: a single-qubit coupled to a two-level system that is exposed to a heat bath. We systematically search for optimal pulses using a generalization of the novel open systems gradient ascent pulse engineering algorithm. Next to the known optimal bias point of this model, there are optimal pulses which lead to high-fidelity quantum operations for a wide range of decoherence parameters.
authors.affiliation: Department Physik, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstrasse 37, 80333 München, Germany. rebentr@fas.harvard.edu
authors.forename: P
authors.initials: P
authors.lastname: Rebentrost
authors.forename: I
authors.initials: I
authors.lastname: Serban
authors.forename: T
authors.initials: T
authors.lastname: Schulte-Herbrüggen
authors.forename: F K
authors.initials: FK
authors.lastname: Wilhelm