量子科学论坛（第五十一期）

日期和时间Date & Time

2021年9月8日（周三）10:30-11:30

云会议号ZOOM Meeting

ID: 775 921 8510

 (Passcode: Quantum)

报告人Speaker 

Yingkai Ouyang   新加坡国立大学博士

主持人Host 

刘    东   清华大学副教授，量子院兼聘研究员

题目Title

Tailor-made quantum error correction codes: Coherent error avoiding codes and permutation-invariant codes

摘要Abstract 

This talk comprises of two parts. 

Part I:Coherent errors, which arise from collective couplings, are a dominant form of noise in many realistic quantum systems, and are more damaging than oft considered stochastic errors. Here, we propose a simple strategy of integrating stabilizer codes with constant-excitation codes by code concatenation to completely avoid coherent errors. Namely, we can concatenate an [[n,k,d]] stabilizer outer code with dual-rail inner codes, to obtain a [[2n,k,d]] constant-excitation code immune from coherent phase errors.

Part II. Permutation-invariant quantum codes are invariant under any permutation of the underlying particles. These codes could have potential applications in quantum sensors and quantum memories. Here I will review the field of permutation-invariant codes, from code constructions to applications.

报告人简介About the speaker 

Yingkai Ouyang received his Ph.D. degree in Combinatorics and Optimization from the University of Waterloo in 2013. He did postdocs in Singapore and Sheffield, UK, and is currently at the National University of Singapore. His research interest lies in quantum error correction and intersections with quantum metrology, quantum computation and other aspects of quantum information theory.