Jianxin Chen

• Associate Professor

• Department of Computer Science and Technology

• Joined Department: 2025

• Email: chenjianxin@tsinghua.edu.cn

Education background

Bachelor of Computer Science, Tsinghua University, Beijing, China, 2005;

Ph.D. in Computer Science, Tsinghua University, Beijing, China, 2010.

Areas of Research Interests

Quantum Computer Architecture and Systems, Quantum Error Correction and Fault-tolerant Quantum Computing, Quantum Hardware-software Codesign, and Quantum Information Science

Research Status

My research primarily focuses on quantum architecture and systems, as well as quantum error correction and fault tolerance. In the domain of quantum architecture and systems, my collaborators and I have proposed redefining quantum instruction sets to unlock the full potential of quantum chips. We have introduced a series of single-qubit and two-qubit quantum instruction designs along with their microarchitectural implementations, significantly enhancing the accuracy of quantum program execution.

In the realm of quantum error correction and fault tolerance, we have developed a real-time quantum error decoding scheme that operates in the time domain, enabling scalable error correction. This approach has successfully reduced the per-cycle error processing time on superconducting quantum chips to within one microsecond, effectively resolving the backlog issue.

Building on this foundation, we have further advanced techniques such as vector processor acceleration for quantum computing and configurable quantum instruction sets, addressing the challenges of large-scale quantum chip addressing and control overhead. Leading a collaborative project, we have developed a complete system encompassing quantum instructions and control instructions, a quantum compilation framework, quantum error correction middleware, and control electronics. This work has realized the full-stack control of quantum chips, demonstrating a prototype implementation of a fault-tolerant quantum computing system, which has undergone initial testing and validation on actual quantum hardware.

I have published nearly 70 papers in leading journals and conferences across computer science and physics, including Nature Computational Science, Physical Review Letters, PRX Quantum, IEEE Transactions on Information Theory, Communications in Mathematical Physics, and ACM Transactions on Quantum Computing, as well as conferences such as QIP, ASPLOS, and DAC.

Academic Achievement

1. Jianxin Chen, Dawei Ding, Weiyuan Gong, Cupjin Huang, and Qi Ye. "One gate scheme to rule them all: Introducing a complex yet reduced instruction set for quantum computing." In Proceedings of the 29th ACM International Conference on Architectural Support for Programming Languages and Operating Systems, Volume 2, pp. 779-796. 2024.

2. Fang Zhang, Xing Zhu, Rui Chao, Cupjin Huang, Linghang Kong, Guoyang Chen, Dawei Ding, Haishan Feng, Yihuai Gao, Xiaotong Ni, Liwei Qiu, Zhe Wei, Yueming Yang, Yang Zhao, Yaoyun Shi, Weifeng Zhang, Peng Zhou, and Jianxin Chen. "A Classical Architecture For Digital Quantum Computers." ACM Transactions on Quantum Computing 5, no. 1 (2023): 1-24.

3. Xinyu Tan, Fang Zhang, Rui Chao, Yaoyun Shi, and Jianxin Chen. "Scalable surface-code decoders with parallelization in time." PRX Quantum 4, no. 4 (2023): 040344.

4. Jianxin Chen, Dawei Ding, Cupjin Huang, and Linghang Kong. "Linear cross-entropy benchmarking with Clifford circuits." Physical Review A 108, no. 5 (2023): 052613.

5. Jianxin Chen, Dawei Ding, Cupjin Huang, and Qi Ye. "Compiling arbitrary single-qubit gates via the phase shifts of microwave pulses." Physical Review Research 5, no. 2 (2023): L022031.

6. Cupjin Huang, Tenghui Wang, Feng Wu, Dawei Ding, Qi Ye, Linghang Kong, Fang Zhang, Xiaotong Ni, Zhijun Song, Yaoyun Shi, Hui-Hai Zhao, Chunqing Deng, and Jianxin Chen. "Quantum instruction set design for performance." Physical Review Letters 130, no. 7 (2023): 070601.

7. Xiaotong Ni, Hui-Hai Zhao, Lei Wang, Feng Wu, and Jianxin Chen. "Integrating quantum processor device and control optimization in a gradient-based framework." npj Quantum Information 8, no. 1 (2022): 106.

8. Jianxin Chen, Dawei Ding, and Cupjin Huang. "Randomized benchmarking beyond groups." PRX Quantum 3, no. 3 (2022): 030320.

9. Feng Bao, Hao Deng, Dawei Ding, Ran Gao, Xun Gao, Cupjin Huang, Xun Jiang, Hsiang-Sheng Ku, Zhisheng Li, Xizheng Ma, Xiaotong Ni, Jin Qin, Zhijun Song, Hantao Sun, Chengchun Tang, Tenghui Wang, Feng Wu, Tian Xia, Wenlong Yu, Fang Zhang, Gengyan Zhang, Xiaohang Zhang, Jingwei Zhou, Xing Zhu, Yaoyun Shi, Jianxin Chen, Hui-Hai Zhao and Chunqing Deng. "Fluxonium: An alternative qubit platform for high-fidelity operations." Physical review letters 129, no. 1 (2022): 010502.

10. Cupjin Huang, Fang Zhang, Michael Newman, Xiaotong Ni, Dawei Ding, Junjie Cai, Xun Gao, Tenghui Wang, Feng Wu, Gengyan Zhang, Hsiang-Sheng Ku, Zhengxiong Tian, Junyin Wu, Haihong Xu, Huanjun Yu, Bo Yuan, Mario Szegedy, Yaoyun Shi, Hui-Hai Zhao, Chunqing Deng, and Jianxin Chen. "Efficient parallelization of tensor network contraction for simulating quantum computation." Nature Computational Science 1, no. 9 (2021): 578-587.

11. Jianxin Chen, Andrew M. Childs, and Shih-Han Hung. "Quantum algorithm for multivariate polynomial interpolation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2209 (2018): 20170480.

12. Tao Xin, Dawei Lu, Joel Klassen, Nengkun Yu, Zhengfeng Ji, Jianxin Chen, Xian Ma, Guilu Long, Bei Zeng, and Raymond Laflamme. "Quantum state tomography via reduced density matrices." Physical review letters 118, no. 2 (2017): 020401.

13. Dawei Lu, Tao Xin, Nengkun Yu, Zhengfeng Ji, Jianxin Chen, Guilu Long, Jonathan Baugh, Xinhua Peng, Bei Zeng, and Raymond Laflamme. "Tomography is necessary for universal entanglement detection with single-copy observables." Physical review letters 116, no. 23 (2016): 230501.

14. Jianxin Chen, and Nathaniel Johnston. "The minimum size of unextendible product bases in the bipartite case (and some multipartite cases)." Communications in Mathematical Physics333 (2015): 351-365.

15. Lin Chen, Jianxin Chen, Dragomir Ž. Đoković, and Bei Zeng. "Universal subspaces for local unitary groups of fermionic systems." Communications in Mathematical Physics 333 (2015): 541-563.

16. Toby S. Cubitt, Jianxin Chen, and Aram W. Harrow. "Superactivation of the asymptotic zero-error classical capacity of a quantum channel." IEEE transactions on information theory 57, no. 12 (2011): 8114-8126.

17. Jianxin Chen, Toby S. Cubitt, Aram W. Harrow, and Graeme Smith. "Entanglement can completely defeat quantum noise." Physical review letters 107, no. 25 (2011): 250504.