论文标题

超导电路中非绝热几何量子门的实验实现

Experimental Implementation of Noncyclic and Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit

论文作者

Ma, Zhuang, Xu, Jianwen, Chen, Tao, Zhang, Yu, Zheng, Wen, Lan, Dong, Xue, Zheng-Yuan, Tan, Xinsheng, Yu, Yang

论文摘要

基于几何阶段的量子门具有固有的噪声耐力特征,因此引起了很多关注。但是,以前几何量子计算的实现通常需要较长的门脉冲时间。结果,他们的实验控制不可避免地遭受了由于超时消耗而导致系统错误的累积干扰。在这里,我们在超导电路中实验实现了一组非绝热的几何量子门,这大大缩短了栅极时间。而且,我们通过使用随机的基准测试方法,与常规的单位误差和Qubit频率移位诱导的误差相比,我们通过实验验证了我们的通用单量几何门对Rabi频率误差和Qubit频率移位诱导的误差更加健壮。此外,该方案可用于构建两量的几何操作,而最大纠缠的钟形状态的产生则被证明。因此,我们的结果为超导量子电路中的快速,高保真和误差量子门提供了有希望的常规。

Quantum gates based on geometric phases possess intrinsic noise-resilience features and therefore attract much attention. However, the implementations of previous geometric quantum computation typically require a long pulse time of gates. As a result, their experimental control inevitably suffers from the cumulative disturbances of systematic errors due to excessive time consumption. Here, we experimentally implement a set of noncyclic and nonadiabatic geometric quantum gates in a superconducting circuit, which greatly shortens the gate time. And also, we experimentally verify that our universal single-qubit geometric gates are more robust to both the Rabi frequency error and qubit frequency shift-induced error, compared to the conventional dynamical gates, by using the randomized benchmarking method. Moreover, this scheme can be utilized to construct two-qubit geometric operations, while the generation of the maximally entangled Bell states is demonstrated. Therefore, our results provide a promising routine to achieve fast, high-fidelity, and error-resilient quantum gates in superconducting quantum circuits.

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