Beijing Institute of Mathematical Sciences and Applications

Song Cheng , Dawei Ding , Jinpeng Liu , Zhengwei Liu , Ziwen Liu

Jiang Zhang

Thursday, November 28, 2024 2:00 PM - 3:30 PM

A3-4-101

Zoom 537 192 5549 (BIMSA)

Reliable quantum computation relies on the utilization of logical qubits, making it imperative to demonstrate their superior performance over physical qubits. Dynamical decoupling emerges as an effective approach to protecting logical qubits against environmental noise. Recent progress in this area includes using dynamical decoupling to generate decoherence-free subspaces (DFS) and subsystems (NS), where logical qubits can be stored. Here, we propose and experimentally demonstrate a scheme for protecting logical qubits by implementing iSWAP gates on nearest-neighbor superconducting transmons. Our experiments reveal that the decoherence time of a logical qubit is extended by up to 365% compared to the best-performing physical qubit. To the best of our knowledge, we demonstrate for the first time that multiple logical qubits outperform their physical counterparts in superconducting qubits. Given its measurement-free nature, our scheme holds promise as a component for future fault-tolerant quantum computation.

张江，现任北京量子信息科学研究院副研究员，于2015年在山东大学物理系获得博士学位，2015至2019年先后在北京计算科学研究中心和清华大学物理系从事博士后工作。2019年10月加入鹏城国家实验室量子计算研究中心，获得深圳市后备人才计划。2020年11月起在北京量子信息科学研究院算法团队工作，主要研究方向为几何量子计算、量子噪声的抑制和量子纠错。目前已主持两项国家级基金，发表文章十余篇，包括Physics Review Letters一篇、长篇综述Physics Reports一篇。