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• W3200273303 abstract "Improving two-qubit gate performance and suppressing crosstalk are major, but often competing, challenges to achieving scalable quantum computation. In particular, increasing the coupling to realize faster gates has been intrinsically linked to enhanced crosstalk due to unwanted two-qubit terms in the Hamiltonian. Here, we demonstrate a novel coupling architecture for transmon qubits that circumvents the standard relationship between desired and undesired interaction rates. Using two fixed frequency coupling elements to tune the dressed level spacings, we demonstrate an intrinsic suppression of the static $ZZ$, while maintaining large effective coupling rates. Our architecture reveals no observable degradation of qubit coherence ($T_1,T_2 > 100~mu s$) and, over a factor of 6 improvement in the ratio of desired to undesired coupling. Using the cross-resonance interaction we demonstrate a 180~ns single-pulse CNOT gate, and measure a CNOT fidelity of 99.77(2)$%$ from interleaved randomized benchmarking." @default.
• W3200273303 created "2021-09-27" @default.
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• W3200273303 date "2021-09-22" @default.
• W3200273303 modified "2023-10-14" @default.
• W3200273303 title "Demonstration of a High-Fidelity cnot Gate for Fixed-Frequency Transmons with Engineered <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>Z</mml:mi><mml:mi>Z</mml:mi></mml:mrow></mml:math> Suppression" @default.
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• W3200273303 doi "https://doi.org/10.1103/physrevlett.127.130501" @default.
• W3200273303 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34623861" @default.
• W3200273303 hasPublicationYear "2021" @default.
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