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Two Qubit Gate Decomposition in Qiskit

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  • last reply by JackSong March 14, 2022
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    Randomizer
    Members 9 posts
    March 13, 2022, 8:23 a.m. March 13, 2022, 8:23 a.m.
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    Is there any built-in functions in Qiskit to help with two qubit gate decomposition? Thanks in advance!

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    JackSong
    Members 12 posts
    March 14, 2022, 2:07 p.m. March 14, 2022, 2:07 p.m.
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    @Randomizer has written:

    Is there any built-in functions in Qiskit to help with two qubit gate decomposition? Thanks in advance!

    Hi there, just want to clarify the post. Are you trying to decompose some arbitrary 2-qubit unitary operation into some basis gates? If so, u might find the following useful:

    qiskit.org/documentation/stubs/qiskit.quantum_info.TwoQubitBasisDecomposer.html

    FYI, u might also want to understand how to construct a universal 2-qubit gate [1]. The conclusion is we need at least 15 single qubit rotation gates from ${ R_y, R_z }$ and 3 CNOT gates.

    [1] Shende, Vivek V., Igor L. Markov, and Stephen S. Bullock. "Minimal universal two-qubit controlled-NOT-based circuits." Physical Review A 69.6 (2004): 062321.

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