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    Phase-controlled two-qubit quantum gates


    Malinovsky, Vladimir S. and Sola, Ignacio R. and Vala, Jiri (2014) Phase-controlled two-qubit quantum gates. Physical Review A, 89 (032301). ISSN 1050-2947

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    Abstract

    We consider an implementation of a two-qubit entangling gate between trapped ions controlled by fully overlapping laser pulses. We particularly address the role of a relative phase between the pulses in the gate design. Though, in general, the relative phase determines the exact form of the two-qubit operation, it is shown that it affects only its single qubit part and has no effect on its entangling content. Based on a general canonical decomposition of the evolution operator we demonstrate that the controlled-NOT (CNOT) gate can be decomposed in terms of a two-qubit entangled gate and single qubit phase gates. Our study shows that any relative phase errors in two-qubit operations related to phase fluctuations of the external fields can be successfully corrected locally by single-qubit operations, which are usually easy to implement.

    Item Type: Article
    Keywords: Phase-controlled; two-qubit; quantum gates;
    Academic Unit: Faculty of Science and Engineering > Mathematical Physics
    Item ID: 5479
    Identification Number: https://doi.org/10.1103/PhysRevA.89.032301
    Depositing User: Dr. Jiri Vala
    Date Deposited: 13 Oct 2014 11:02
    Journal or Publication Title: Physical Review A
    Publisher: American Physical Society
    Refereed: Yes
    URI:

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