利用双光子跃迁在氟鎓量子比特上纠缠门的提议

K. Nesterov, Q. Ficheux, V. Manucharyan, M. Vavilov
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引用次数: 13

摘要

我们在两个电容耦合的量子比特上提出了一个微波激活的纠缠门。在$ b|0 \rangle - $ b|1 \rangle$跃迁半频率附近的频率上施加微波脉冲,由于fluxonium的强非调和性,诱导双光子Rabi振荡,在计算子空间外泄漏可以忽略不计。通过调整驱动频率、幅度和持续时间,我们获得了局部等效于费米子模拟门(如$\sqrt{\rm SWAP}$-like和控制相位门)的门族。在脉冲持续时间小于100 ns的情况下,栅极误差可以调谐到$10^{-4}$以下,而无需过多的电路参数匹配。考虑到fluxonium相干时间可以超过1 ms,我们的门方案在大规模量子处理器上是有前景的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Proposal for Entangling Gates on Fluxonium Qubits via a Two-Photon Transition
We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-frequency of the $|00\rangle - |11\rangle$ transition induces two-photon Rabi oscillations with a negligible leakage outside the computational subspace, owing to the strong anharmonicity of fluxoniums. By adjusting the drive frequency, amplitude, and duration, we obtain the gate family that is locally equivalent to the fermionic-simulation gates such as $\sqrt{\rm SWAP}$-like and controlled-phase gates. The gate error can be tuned below $10^{-4}$ for a pulse duration under 100 ns without excessive circuit parameter matching. Given that the fluxonium coherence time can exceed 1 ms, our gate scheme is promising for large-scale quantum processors.
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