报告人：顾炎武 助理研究员 (北京量子信息科学研究院)

时 间：2023年04月26日(周三) 下午 14:00-15:00

地 点：7003全讯入口良乡校区 理学楼B203

摘要：

We develop an error mitigation method for the control-free phase estimation. We prove a theorem that under the first-order correction, the noise channels with only Hermitian Kraus operators do not change the phases of a unitary operator, and therefore, the benign types of noise for phase estimation are identified. By using the randomized compiling protocol, we can convert the generic noise in the phase estimation circuits into stochastic Pauli noise, which satisfies the condition of our theorem. Thus we achieve a noise-resilient phase estimation without any quantum resource overhead. The simulated experiments show that our method can significantly reduce the estimation error of the phases by up to two orders of magnitude. Our method paves the way for the utilization of quantum phase estimation before the advent of fault-tolerant quantum computers.

简历：

顾炎武，先后在四川大学物理系和新加坡国立大学物理系获学士和博士学位。之后在新加坡国立大学量子技术中心和北京量子信息科学研究院从事博士后研究。2023年4月至今在北京量子信息科学研究院担任助理研究员。主要研究领域为量子系统噪声表征和错误缓解等。

联系方式：jiangwei.shang@bit.edu.cn

邀请人： 尚江伟

网 址：/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室

*Speaker：Yanwu Gu (Beijing Academy of Quantum Information Sciences)

*Time：14:00-15:00, 26 Apr 2023

*Place：Science Building B203, BIT Liangxiang campus

*Contact Person：Jiangwei Shang

*Abstract：

We develop an error mitigation method for the control-free phase estimation. We prove a theorem that under the first-order correction, the noise channels with only Hermitian Kraus operators do not change the phases of a unitary operator, and therefore, the benign types of noise for phase estimation are identified. By using the randomized compiling protocol, we can convert the generic noise in the phase estimation circuits into stochastic Pauli noise, which satisfies the condition of our theorem. Thus we achieve a noise-resilient phase estimation without any quantum resource overhead. The simulated experiments show that our method can significantly reduce the estimation error of the phases by up to two orders of magnitude. Our method paves the way for the utilization of quantum phase estimation before the advent of fault-tolerant quantum computers.

*Profile：

Yanwu Gu received his bachelor's and doctoral degrees from the Department of Physics of Sichuan University and the Department of Physics of National University of Singapore. After that, he worked as a postdoctoral researcher at the Centre for Quantum Technologies in Singapore and Beijing Academy of Quantum Information Sciences (Baqis). Since April 2023, he has been an assistant researcher at Baqis. His main research field is the quantum noise characterization methods and error mitigation.