Ancilla-driven universal quantum computation

Janet Anders, Daniel K. L. Oi, Elham Kashefi, Dan E. Browne, Erika Andersson

Research output: Contribution to journalArticle

42 Citations (Scopus)

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.

LanguageEnglish
Article number020301(R)
Number of pages4
JournalPhysical Review A
Volume82
Issue number2
DOIs
Publication statusPublished - 10 Aug 2010

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registers
quantum computation
interactions
preparation

Keywords

  • ancilla qubit
  • quantum computation
  • quantum register

Cite this

Anders, J., Oi, D. K. L., Kashefi, E., Browne, D. E., & Andersson, E. (2010). Ancilla-driven universal quantum computation. Physical Review A, 82(2), [020301(R)]. https://doi.org/10.1103/PhysRevA.82.020301
Anders, Janet ; Oi, Daniel K. L. ; Kashefi, Elham ; Browne, Dan E. ; Andersson, Erika. / Ancilla-driven universal quantum computation. In: Physical Review A. 2010 ; Vol. 82, No. 2.
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Anders, J, Oi, DKL, Kashefi, E, Browne, DE & Andersson, E 2010, 'Ancilla-driven universal quantum computation' Physical Review A, vol. 82, no. 2, 020301(R). https://doi.org/10.1103/PhysRevA.82.020301

Ancilla-driven universal quantum computation. / Anders, Janet; Oi, Daniel K. L.; Kashefi, Elham; Browne, Dan E.; Andersson, Erika.

In: Physical Review A, Vol. 82, No. 2, 020301(R), 10.08.2010.

Research output: Contribution to journalArticle

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AU - Anders, Janet

AU - Oi, Daniel K. L.

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Anders J, Oi DKL, Kashefi E, Browne DE, Andersson E. Ancilla-driven universal quantum computation. Physical Review A. 2010 Aug 10;82(2). 020301(R). https://doi.org/10.1103/PhysRevA.82.020301