Quantum technology seminar | Building Superconducting Quantum Processors: State of the Art and Challenges

by Andreas Wallraff (ETH Zürich)




Superconducting circuits are ideally suited for studying quantum phenomena at the macroscopic scale. Since mid-complexity circuits, containing a few tens to a few hundreds of elements, can be designed, fabricated, and operated with relative ease using present day technology, they are one of the prime contenders for realizing quantum computers. Using superconducting circuits academic and industrial labs aim at both addressing noisy intermediate-scale quantum (NISQ) problems and realizing universal quantum computation in fault-tolerant processors. Realizing large scale integrated circuits, which can address commercially relevant computational problems, however, still requires significant conceptual and technological progress.

In this talk, I will introduce the quantum physics of superconducting circuits and the concept of circuit quantum electrodynamics [1], which underlies much of the hardware which is used in superconducting quantum processors. As an example of our current research, I will then discuss our experimental efforts [2] towards realizing quantum error correction in superconducting circuits, which is an essential ingredient for reaching the full potential of fault-tolerant universal quantum computation. Finally, I will discuss the challenges on the route toward large-scale quantum processors based on superconducting circuits.

[1] A. Blais et al., arXiv:2005.12667 (2020)
[2] C. K. Andersen et al., Nat. Physics (2020)

Looking forward to stimulating discussions, the DESY FS-QT task force (Martin Beye, Ralf Röhlsberger, Kai Rossnagel, Robin Santra, Andreas Stierle, Hans-Christian Wille)

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