Demonstration of a High-FidelitycnotGate for Fixed-Frequency Transmons with EngineeredZZSuppression,Physical Review Letters

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Demonstration of a High-FidelitycnotGate for Fixed-Frequency Transmons with EngineeredZZSuppression
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-09-22 , DOI: 10.1103/physrevlett.127.130501
A Kandala ₁ , K X Wei ₁ , S Srinivasan ₁ , E Magesan ₁ , S Carnevale ₁ , G A Keefe ₁ , D Klaus ₁ , O Dial ₁ , D C McKay ₁

Affiliation

Improving two-qubit gate performance and suppressing cross talk 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 cross talk 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

Z Z

while maintaining large effective coupling rates. Our architecture reveals no observable degradation of qubit coherence (

T_{1}, T_{2} > 100 μ 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 controlled not (cnot) gate, and measure a cnot fidelity of 99.77(2)% from interleaved randomized benchmarking.

中文翻译：

具有工程 ZZSuppression 的固定频率传输的高保真 cnotGate 的演示

提高双量子位门性能和抑制串扰是实现可扩展量子计算的主要挑战，但通常是相互竞争的挑战。特别是，由于哈密顿量中不需要的双量子位项，增加耦合以实现更快的门与增强的串扰有着内在的联系。在这里，我们展示了一种新颖的 transmon 量子位耦合架构，它规避了期望和不期望的交互率之间的标准关系。使用两个固定频率耦合元件来调整穿戴电平间距，我们展示了对静态的固有抑制