PNNL

Chenxu Liu is a physicist who is has been working as a postdoctoral research assistant in Pacific Northwest National Laboratory’s High-Performance Computing group since 2023. His research focuses on quantum optics and its application in designing quantum computing devices and control protocols, quantum communication using photonic graph states, entanglement purification and concentration, quantum algorithms applied to near-term quantum hardware, as well as quantum computing architecture design. After he received his PhD from the University of Pittsburgh, where he majored in physics, he joined Virginia Tech as a postdoctoral research associate in Professors Sophia Economou and Edwin Barnes’s group. Since receiving his PhD, he has led and participated in multiple research projects in quantum computing and quantum information processing. He has published papers in peer-reviewed journals, such as the Physical Review series and Nature Communications. He has also presented scientific talks at conferences held by the American Physical Society and Optica, and has led invited talks at various other conferences and workshops.

• Quantum computing architecture
• Quantum computing
• Quantum information
• Quantum optics

• PhD in physics, University of Pittsburgh
• BS in physics, Nankai University

• American Physical Society

• Seed Postdoctoral Research Funding Award, Co-design Center for Quantum Advantage, awarded for Device and Policy Design for a Shared Quantum Buffer for Quantum Communication in Superconducting-based Distributed Quantum Computing Systems, 2023
• Seed Postdoctoral Research Funding Award, Co-design Center for Quantum Advantage, awarded Machine Learning Assisted Variational Quantum Algorithms for Near-term Quantum Information Applications, 2022
• Kenneth P. Dietrich School of Art and Science Fellowship, University of Pittsburgh, 2019
• Graduate Student Research Award, Pittsburgh Quantum Institute, University of Pittsburgh, 2018
• Graduate Student Research Award, Pittsburgh Quantum Institute, University of Pittsburgh, 2016

2023

• Asthana A., C. Liu, O.R. Meitei, S.E. Economou, E. Barnes, and N.J. Mayhall. 2023. “Leakage Reduces Device Coherence Demands for Pulse-Level Molecular Simulations.” Phys. Rev. Appl. 19, 064071. doi:10.1103/PhysRevApplied.19.064071
• Frantzeskakis R., C. Liu, Z. Raissi, E. Barnes, and S.E. Economou. 2023. “Extracting perfect GHZ states from imperfect weighted graph states via entanglement concentration.” Phys. Rev. Res. 5, 023124. doi:10.1103/PhysRevResearch.5.023124
• Liu, C., R. Frantzeskakis, S.E. Economou, and E. Barnes. 2023. “Protocol for nearly deterministic parity projection on two photonic qubits.” arXiv preprint arXiv: 2308.09035
• Liu C., M. Wang, S.A. Stein, Y. Ding, and A. Li. 2023. “Quantum Memory: A Missing Piece in Quantum Computing Units.” arXiv preprint arXiv: 2309.14432
• Stein S., F. Hua, C. Liu, C. Guinn, J. Ang, E. Zhang, S. Chakram, Y. Ding, and A. Li. 2023. “Multi-mode Cavity Centric Architectures for Quantum Simulation.” arXiv preprint arXiv: 2309.15994
• Xia M., C. Zhou, C. Liu, P. Patel, X. Cao, P. Lu, B. Mesits, M. Mucci, D. Gorski, D. Pekker, and M. Hatridge. 2023. “Fast superconducting qubit control with sub-harmonic drives.” arXiv preprint arXiv: 2306.10162

2022

• Ang J., G. Carini, Y. Chen, I. Chuang, M. A. DeMarco, S. E. Economou, A. Eickbusch, A. Faraon, K.-M. Fu, S. M. Girvin, M. Hatridge, A. Houck, P. Hilaire, K. Krsulich, A. Li, C. Liu, Y. Liu, M. Martonosi, D. C. McKay, J. Misewich, M. Ritter, R. J. Schoelkopf, S. A. Stein, S. Sussman, H. X. Tang, W. Tang, T. Tomesh, N. M. Tubman, C. Wang, N. Wiebe, Y.-X. Yao, D. C. Yost, and Y. Zhou. 2022. “Architectures for Multinode Superconducting Quantum Computers.” arXiv preprint arXiv:2212.06167
• Chen Y., L. Zhu, C. Liu, N.J. Mayhall, E. Barnes, and S.E. Economou. 2022. “How Much Entanglement Do Quantum Optimization Algorithms Require?” arXiv preprint arXiv:2205.12283
• Liu C., E. Barnes, and S.E. Economou. 2022. “Proposal for generating complex microwave graph states using superconducting circuits.” arXiv preprint arXiv:2201.00836

2021

• Liu C., M. Mucci, X. Cao, M.V. Gurudev Dutt, M. Hatridge, and D. Pekker. 2021. “Proposal for a continuous wave laser with linewidth well below the standard quantum limit.” Nature Communications 12, 5620. doi:10.1038/s41467-021-25879-8

2020

• Chien T.C., O. Lanes, C. Liu, X. Cao, P. Lu, S. Motz, G. Liu, D. Pekker, David, and M. Hatridge. 2020. “Multiparametric amplification and qubit measurement with a Kerr-free Josephson ring modulator.” Phys. Rev. A 101, 042336. doi:10.1103/PhysRevA.101.042336
• Liu C., T.-C. Chien, M. Hatridge, and D. Pekker. 2020. “Optimizing Josephson-ring-modulator-based Josephson parametric amplifiers via full Hamiltonian control.” Phys. Rev. A 101, 042323. doi:10.1103/PhysRevA.101.042323

2018

• Liu C., M.V. Gurudev Dutt, and D. Pekker. 2018. "Robust manipulation of light using topologically protected plasmonic modes," Opt. Express 26, 2857-2872.
• Liu C., M.V. Gurudev Dutt, and D. Pekker. 2018. “Single-photon heralded two-qubit unitary gates for pairs of nitrogen-vacancy centers in diamond.” Phys. Rev. A 98, 052342. doi:10.1103/PhysRevA.98.052342