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  • Rapid readout of a register of qubits using open loop quantum control

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    Author(s)
    Combes, Joshua
    Denney, Aaron
    Wiseman, Howard M
    Griffith University Author(s)
    Wiseman, Howard M.
    Combes, Joshua LA.
    Year published
    2015
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    Abstract
    Measurements are a primitive for characterizing quantum systems. Reducing the time taken to perform a measurement may be beneficial in many areas of quantum information processing. We show that permuting the eigenvalues of the state matrix in the logical basis, using open-loop control, provides an O ( n ) reduction in the measurement time, where n is the number of qubits in the register. This reduction is of the same order as the (previously introduced) locally optimal feedback protocol. The advantage of the open-loop protocol is that it is far less difficult experimentally. Because the control commutes with the measured ...
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    Measurements are a primitive for characterizing quantum systems. Reducing the time taken to perform a measurement may be beneficial in many areas of quantum information processing. We show that permuting the eigenvalues of the state matrix in the logical basis, using open-loop control, provides an O ( n ) reduction in the measurement time, where n is the number of qubits in the register. This reduction is of the same order as the (previously introduced) locally optimal feedback protocol. The advantage of the open-loop protocol is that it is far less difficult experimentally. Because the control commutes with the measured observable at all times, our rapid measurement protocol could be used for characterizing a quantum system, by state or process tomography, or to implement measurement-based quantum error correction.
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    Journal Title
    Physical Review A
    Volume
    91
    Issue
    2
    DOI
    https://doi.org/10.1103/PhysRevA.91.022305
    Copyright Statement
    © 2015 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Quantum Information, Computation and Communication
    Mathematical Sciences
    Physical Sciences
    Chemical Sciences
    Publication URI
    http://hdl.handle.net/10072/150994
    Collection
    • Journal articles

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