Implementing two-qubit gates at the quantum speed limit
Implementing two-qubit gates at the quantum speed limit
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以量子速度极限实现两个量子位门
DOI：
10.1103/physrevresearch.5.043194
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发表时间：
2023
影响因子：
4.2
通讯作者：
Singh, Meenakshi
中科院分区：
文献类型：
--
作者：
Howard, Joel;Lidiak, Alexander;Jameson, Casey;Basyildiz, Bora;Clark, Kyle;Zhao, Tongyu;Bal, Mustafa;Long, Junling;Pappas, David P.;Singh, Meenakshi
基本量子门的速度，尤其是双量子比特门的速度，最终决定了量子电路运行速度的极限。在这项工作中，我们通过实验证明了常用的两个量子比特门在两个超导transmon量子比特之间的物理相互作用强度允许的几乎最快的速度。我们通过实现使用机器学习启发的最优控制方法设计的实验门来实现这种量子速度限制。重要的是，我们的方法只需要单量子位驱动强度比相互作用强度大一些，就可以实现接近其分析速度极限的任意双量子位门，并且保真度高。因此，该方法适用于各种平台，包括具有可比较的单量子比特和双量子比特门速度的平台，或具有始终在线交互的平台。我们希望我们的方法能够为非本地双量子位门提供显着的加速，这些门通常是通过长序列的单量子位和本地双量子位门实现的。
The speed of elementary quantum gates, particularly two-qubit gates, ultimately sets the limit on the speed at which quantum circuits can operate. In this work, we experimentally demonstrate commonly used two-qubit gates at nearly the fastest possible speed allowed by the physical interaction strength between two superconducting transmon qubits. We achieve this quantum speed limit by implementing experimental gates designed using a machine-learning-inspired optimal control method. Importantly, our method only requires the single-qubit drive strength to be moderately larger than the interaction strength to achieve an arbitrary two-qubit gate close to its analytical speed limit with high fidelity. Thus the method is applicable to a variety of platforms, including those with comparable single-qubit and two-qubit gate speeds, or those with always-on interactions. We expect our method to offer significant speedups for non-native two-qubit gates that are typically achieved with a long sequence of single-qubit and native two-qubit gates.
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影响因子：
6.4
作者：
Preskill, John
通讯作者：
Preskill, John
影响因子：
4
作者：
Xian Wu;J. Long;J. Long;H. Ku;R. Lake;M. Bal;D. Pappas
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影响因子：
64.8
作者：
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通讯作者：
Lucas, D. M.
影响因子：
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Houck AA