Di Paolo, Agustin

Date:   Thursday, March 19, 2020
Time:   11:00
Place:   ETH Zurich, Hönggerberg, HPF G 6
Host:    Clemens Müller

Designing high-coherence superconducting qubits

Agustin Di Paolo
Université de Sherbrooke, Canada

Fault-tolerant quantum computation is likely to require daunting hardware resources. In this context, noise-protected superconducting qubits have the potential to greatly reduce qubit overhead. In this talk, I will focus on some of the theoretical aspects related to quantum coherence [1] and control [2] of the 0-π qubit by Brooks, Kitaev and Preskill [3]. I will moreover introduce a slightly modified version of the 0-π qubit that can be experimentally realized with state-of-the-art superconducting-qubit technology. I will discuss the results and the implications of a recent experiment [4] in which we demonstrate the coherent control of a 0-π qubit and coherence times in excess of 1.6 ms (T1) and 25 μs (T2). Finally, I will discuss the development of new theoretical and numerical techniques that could be useful for the engineering of large-scale superconducting quantum circuits, including superinductance-based devices such as the fluxonium qubit [5]. This talk should provide useful insights into the engineering of high-coherence superconducting quantum devices.

[1] P. Groszkowski, ADP et al., New Journal of Physics, 20, 043053 (2018).
[2] ADP et al., New Journal of Physics, 21, 043002 (2019).
[3] Brooks et al., Phys. Rev. A 87, 52306 (2013).
[4] A. Gyenis, P. S. Mundada, ADP et al., arXiv:1910.07542 (2019).
[5] ADP et al., arXiv:1912.01018 (2019)