ABSTRACT
Superconducting quantum circuits show great promise for building scalable quantum processors. The size of superconducting quantum processors has steadily increased from a handful to dozens of qubits over the past decade, and will likely extend to thousands of qubits over the next decade with continuous efforts in qubit integration and packaging driven by applications of practical interest. However, problems such as available wafer size, device yield and control wiring fanout pose serious emerging technical challenges as the chip size gets bigger and bigger. A modular approach, where smaller size quantum modules are individually constructed and calibrated, then assembled into a larger architecture using quantum coherent interconnects, can circumvent these challenges and scale up superconducting quantum computers in an additive manner. In recent years, several experiments have demonstrated quantum state transfer between two superconducting quantum modules connected by coaxial cables/waveguides [1-5], with ~80% fidelities, primarily limited by channel loss. More recent efforts using direct wirebond connection[6] or capacitive coupling [7] between the quantum modules and the coaxial cables have significantly reduced the loss, improving the state transfer fidelity to ~90%. Using ultralow-loss custom superconducting cables and optimizing the chip-cable connection interface, we have now improved the inter-module quantum state transfer and entanglement generation with fidelities as high as 99%, almost 10-fold improved over our previous demonstration [6]. In this talk, I will present our recent experimental results in this direction.
[1] Kurpiers, P. et al. Nature 558, 264–267 (2018). [2] Axline, C. J. et al. Nat. Phys. 14, 705–710 (2018). [3] Campagne-Ibarcq, P. et al. Phys. Rev. Lett. 120, 200501 (2018). [4] Leung, N. et al., npj Quantum Inf. 5, 18 (2019). [5] Magnard, P. et al., Phys. Rev. Lett. 125, 260502 (2020). [6] Zhong, Y. et al., Nature 590, 571–575 (2021). [7] Burkhart, L. D. et al., PRX Quantum 2, 030321 (2021).
BIOGRAPHY
Prof. Youpeng Zhong received his Bachelor degree from Zhejiang University (2009-2013), and studied as a Physics graduate student there from 2013 to 2015. In 2015, he became a Ph.D. student of the Pritzker School of Molecular Engineering, University of Chicago and joint Andrew N. Cleland's group. After he received his Ph.D. degree in 2019, he stayed in the Cleland group as a post-doc for a year, and subsequently joint the Shenzhen Institute for Quantum Science and Engineering, SUSTech as a faculty in 2020. Prof. Zhong's research focuses on superconducting quantum computing, and he has published 24 peered review journal articles, including three in Nature/Science.
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