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Ancilla-driven universal quantum computation

Anders, Janet and Oi, Daniel K. L. and Kashefi, Elham and Browne, Dan E. and Andersson, Erika (2010) Ancilla-driven universal quantum computation. Physical Review A, 82 (2). -. ISSN 1050-2947

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    Abstract

    We introduce a model of quantum computation intermediate between the gate-based and measurement-based models. A quantum register is manipulated remotely with the help of a single ancilla that "drives" the evolution of the register. The fully controlled ancilla qubit is coupled to the computational register only via a fixed unitary two-qubit interaction and then measured in suitable bases, driving both single- and two-qubit operations on the register. Arbitrary single- qubit operations directly on register qubits are not needed. We characterize all interactions E that induce a unitary, stepwise deterministic measurement back-action on the register sufficient to implement any quantum channel. Our scheme offers experimental advantages for computation, state preparation, and generalized measurements, since no tunable control of the register is required.

    Item type: Article
    ID code: 30210
    Keywords: ancilla qubit, quantum computation, quantum register, Physics, Atomic and Molecular Physics, and Optics
    Subjects: Science > Physics
    Department: Faculty of Science > Physics
    Related URLs:
      Depositing user: Pure Administrator
      Date Deposited: 17 Apr 2011 05:10
      Last modified: 27 Mar 2014 21:11
      URI: http://strathprints.strath.ac.uk/id/eprint/30210

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