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- W4367368399 abstract "Variational algorithms such as the Quantum Approximate Optimization Algorithm have attracted attention due to their potential for solving problems using near-term quantum computers. The $ZZ$ interaction typically generates the primitive two-qubit gate in such algorithms applied for a time, typically a variational parameter, $gamma$. Different compilation techniques exist with respect to the implementation of two-qubit gates. Due to the importance of the $ZZ$-gate, we present an error analysis comparing the continuous-angle controlled phase gate (CP) against the fixed angle controlled $Z$-gate (CZ). We analyze both techniques under the influence of coherent over-rotation and depolarizing noise. We show that CP and CZ compilation techniques achieve comparable $ZZ$-gate fidelities if the incoherent error is below $0.03 , %$ and the coherent error is below $0.8 , %$. Thus, we argue that for small coherent and incoherent error a non-parameterized two-qubit gate such as CZ in combination with virtual $Z$ decomposition for single-qubit gates could lead to a significant reduction in the calibration required and, therefore, a less error-prone quantum device. We show that above a coherent error of $0.04 pi$ ($2 , %$), the CZ gate fidelity depends significantly on $gamma$." @default.
- W4367368399 created "2023-04-30" @default.
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- W4367368399 date "2023-04-27" @default.
- W4367368399 modified "2023-09-30" @default.
- W4367368399 title "Coherent and non-unitary errors in ZZ-generated gates" @default.
- W4367368399 doi "https://doi.org/10.48550/arxiv.2304.14212" @default.
- W4367368399 hasPublicationYear "2023" @default.
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