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Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Quantum Information: Quantum Computing and Communication II

Q 54.5: Talk

Thursday, March 3, 2016, 15:30–15:45, e214

Contextuality as a resource for qubit quantum computationRobert Raussendorf1, Dan E. Browne2, Nicolas Delfosse3,4,5, Cihan Okay6, and •Juan Bermejo-Vega7,81Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada — 2Department of Physics and Astronomy, University College London, Gower Street, London, UK — 3Departement de Physique, Universite de Sherbrooke, Sherbrooke, Quebec, Canada — 4IQIM, California Institute of Technology, Pasadena, CA, USA — 5Department of Physics and Astronomy, University of California, Riverside, California, 92521, USA — 6Department of Mathematics, University of Western Ontario, London, Ontario, Canada — 7Max-Planck Institut fuer Quantum Optics, Theory Division, Garching, Germany — 8Dahlem Center for Complex Quantum Systems, Freie Universitaet Berlin, Berlin, Germany

We describe a scheme of quantum computation with magic states on qubits for which contextuality is a necessary resource possessed by the magic states. More generally, we establish contextuality as a necessary resource for all schemes of quantum computation with magic states on qubits that satisfy three simple postulates. Furthermore, we identify stringent consistency conditions on such computational schemes, revealing the general structure by which negativity of Wigner functions, hardness of classical simulation of the computation, and contextuality are connected.

Based on http://arxiv.org/abs/1511.08506

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