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IQUIST Special Seminar: "Realization of modular quantum computers via parametric interactions," Chao Zhou, University of Pittsburg

Event Type
Illinois Quantum Information Science and Technology Center
2008 Superconductivity Center
Jan 10, 2023   11:00 am  
Chao Zhou, Ph.D. Candidate, Department of Physics and Astronomy, University of Pittsburgh
Wolfgang Pfaff
Originating Calendar
IQUIST Events Calendar

Realization of modular quantum computers via parametric interactions

Precisely controlled couplings between qubits are vital parts of all quantum information processing. For superconducting qubits, most platforms employ a network of two-body interactions between nearest-neighbor qubits in a two-dimensional lattice, the so-called “surface code” structure. However, longer range and multi-node couplings are very desirable as they reduce the overhead of interactions between distant qubits, and enable new topologies for large-scale quantum computers. In my PhD research, I have been working on realizing such qubit connections via parametric interactions and using them to build modular quantum computers.  We have realized two modular machines: a modular quantum state router with all-to-all couplings among 4 modules [1], and a compact 4-qubit quantum module. Both systems are designed with the idea of coupling multiple computational modes to a central Superconducting Nonlinear Asymmetric Inductive eLement (SNAIL) and are fully controlled with 3-wave-mixing parametric interactions. I will present experiment results measured in both systems, including fast all-to-all gates between arbitrary module cavity pairs, high-fidelity single and multi-qubit parametric gates, and inter/intra-module qubit entanglement. The operations demonstrated here can readily be extended to faster and higher-fidelity parametric operations, as well as scaled to support larger networks of modular quantum computers [2].

  1. C. Zhou, P. Lu, M. Praquin, T.-C. Chien, R. Kaufman, X. Cao, M. Xia, R. Mong, W. Pfaff, D. Pekker, M. Hatridge. A modular quantum computer based on a quantum state router. arXiv:2109.06848 (2021).
  2. E. McKinney, M. Xia, C. Zhou, P. Lu, M. Hatridge, and A. Jones. Co-designed architectures for modular superconducting quantum computers. To Appear in IEEE Symposium on High Performance Computer Architecture (HPCA) (2023). Available at: arXiv:2205.04387.
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