title: Adaptive quantum computation in changing environments using projective simulation.
abstract: Quantum information processing devices need to be robust and stable against external noise and internal imperfections to ensure correct operation. In a setting of measurement-based quantum computation, we explore how an intelligent agent endowed with a projective simulator can act as controller to adapt measurement directions to an external stray field of unknown magnitude in a fixed direction. We assess the agent's learning behavior in static and time-varying fields and explore composition strategies in the projective simulator to improve the agent's performance. We demonstrate the applicability by correcting for stray fields in a measurement-based algorithm for Grover's search. Thereby, we lay out a path for adaptive controllers based on intelligent agents for quantum information tasks.
authors.affiliation: 1] Institute for Theoretical Physics, University of Innsbruck, Technikerstraße 21A, A-6020, Innsbruck, Austria [2] Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Technikerstraße 21A, A-6020, Innsbruck, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Tiersch
authors.affiliation: Institute for Theoretical Physics, University of Innsbruck, Technikerstraße 21A, A-6020, Innsbruck, Austria.
authors.forename: E J
authors.initials: EJ
authors.lastname: Ganahl
authors.affiliation: 1] Institute for Theoretical Physics, University of Innsbruck, Technikerstraße 21A, A-6020, Innsbruck, Austria [2] Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Technikerstraße 21A, A-6020, Innsbruck, Austria.
authors.forename: H J
authors.initials: HJ
authors.lastname: Briegel