Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit
Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit
复制标题
超导电路中通用非绝热几何量子门的实验实现
DOI：
10.1103/physrevlett.124.230503
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发表时间：
2020
影响因子：
8.6
通讯作者：
Sun L.
中科院分区：
文献类型：
--
作者：
Xu Y.;Hua Z.;Chen Tao;Pan X.;Li X.;Han J.;Cai W.;Ma Y.;Wang H.;Song Y. P.;Xue Zheng-Yuan;Sun L.
利用几何相位实现抗噪声量子计算是提高控制保真度的重要方法。在这项工作中，我们在实验上实现了超导量子比特链中的普适非绝热几何量子门。我们用量子过程层析成像和随机基准测试方法表征了所实现的单量子比特和双量子比特几何门。单量子比特旋转门和双量子比特控制Z门的测量平均保真度分别为0.9977(1)和0.977(9)。此外，我们还通过与控制域中具有不同误差类型的常规动态门的性能比较，实验证明了所实现的单量子比特几何门的抗噪声特性。因此，我们的实验证明了一种实现高保真几何量子门的方法，用于健壮的量子计算。
Using geometric phases to realize noise-resilient quantum computing is an important method to enhance the control fidelity. In this work, we experimentally realize a universal nonadiabatic geometric quantum gate set in a superconducting qubit chain. We characterize the realized single- and two-qubit geometric gates with both quantum process tomography and randomized benchmarking methods. The measured average fidelities for the single-qubit rotation gates and two-qubit controlled-Zgate are 0.9977(1) and 0.977(9), respectively. Besides, we also experimentally demonstrate the noise-resilient feature of the realized single-qubit geometric gates by comparing their performance with the conventional dynamical gates with different types of errors in the control field. Thus, our experiment proves a way to achieve high-fidelity geometric quantum gates for robust quantum computation.