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Jülich Quantum Computing Seminar:

Xuexin Xu, PGI-2

Online Talk

16 Nov 2021 14:00

Modeling and suppressing unwanted parasitic interactions in superconducting circuits


Mitigating crosstalk errors is critically important for achieving high-fidelity entangling gates in multiqubit circuits. For weakly anharmonic superconducting qubits, this error is due to sub-MHz parasitic interaction that reflects a bending between computational and noncomputational levels, and this bending creates a parasitic ZZ interaction.

In this talk I will present the theoretical modeling to evaluate the “static” ZZ interaction between seemingly idle qubits as well as the “dynamical” ZZ interaction based on the cross resonance interaction [1]. By combining qubits of either the same or opposite anharmonicity signs we find the characteristics of static and dynamical ZZ freedoms [2]. 

[1] J. Ku, X. Xu, M. Brink, D. C. McKay, J. B. Hertzberg, M. H. Ansari, B. L. T Plourde, Physical Review Letters 125, 200504 (2020) 

[2] X. Xu and M. H. Ansari, Physical Review Applied 15, 064074 (2021) 

Access details

The "Jülich Quantum Computing Seminar" will take place every fortnight on Tuesdays at 14:00 CET via video conference and is intended to promote cooperation between the working groups conducting research in the field of quantum computing and quantum information at various institutes at Forschungszentrum Jülich.

Here is the access data for all the seminars:

Zoom Link:

Meeting ID: 813 1452 6642
Passcode: 01


Daniel Zeuch
Phone: +49 2461 61-6460