Protecting logical qubits with dynamical decoupling
演讲者
张江
时间
2024年11月28日 14:00 至 15:30
地点
A3-4-101
线上
Zoom 537 192 5549
(BIMSA)
摘要
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.
演讲者介绍
Jiang Zhang is an assistant professor in the quantum algorithm group of Beijing Academy of Quantum Information Sciences (BAQIS). He received his Ph.D degree from Shandong University in 2015. Then he worked at Beijing Computational Science Research Center (CSRC) and Tsinghua University as a postdoctoral fellow. Before joining BAQIS in 2020, he was an assistant professor at Pengcheng Laboratory (PCL) in Shenzhen. His research interests lie in holonomic quantum computation, dynamical decoupling, quantum error correction, and quantum algorithms.