超导电路中通用非绝热几何量子门的实验实现

Experimental Implementation of Universal Nonadiabatic Geometric Quantum Gates in a Superconducting Circuit.

作者信息

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

机构信息

Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China.

Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, GPETR Center for Quantum Precision Measurement, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.

出版信息

Phys Rev Lett. 2020 Jun 12;124(23):230503. doi: 10.1103/PhysRevLett.124.230503.

DOI:10.1103/PhysRevLett.124.230503

PMID:32603172

Abstract

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-Z gate 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.

摘要

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，我们在超导量子比特链中通过实验实现了一个通用的非绝热几何量子门集。我们使用量子过程层析成像和随机基准测试方法对实现的单比特和双比特几何门进行了表征。单比特旋转门和双比特受控Z门的测量平均保真度分别为0.9977(1)和0.977(9)。此外，我们还通过将实现的单比特几何门的性能与控制场中具有不同类型误差的传统动力学门的性能进行比较，通过实验证明了所实现的单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用于稳健量子计算的高保真几何量子门的方法。