title: Magnetic resonance realization of decoherence-free quantum computation.
abstract: We report the realization, using nuclear magnetic resonance techniques, of the first quantum computer that reliably executes a complete algorithm in the presence of strong decoherence. The computer is based on a quantum error avoidance code that protects against a class of multiple-qubit errors. The code stores two decoherence-free logical qubits in four noisy physical qubits. The computer successfully executes Grover's search algorithm in the presence of arbitrarily strong engineered decoherence. A control computer with no decoherence protection consistently fails under the same conditions.
authors.affiliation: Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.
authors.forename: Jason E
authors.initials: JE
authors.lastname: Ollerenshaw
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Lidar
authors.forename: Lewis E
authors.initials: LE
authors.lastname: Kay