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| Home > Publications database > Mitigating parasitic interactions in superconducting circuits |
| Conference Presentation (Invited) | FZJ-2023-00055 |
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2021
Abstract: Implementation of high-performance two-qubit gates is a key factor for scalable quantum computation. However, the state-of-the-art superconducting two-qubit gates are yet far from being perfect due to the parasitic ZZ coupling. In this poster, we introduce a general theory to evaluate the “static” ZZ interaction between seemingly idle qubits [1] as well as the “dynamical” ZZ interaction between driving entangled qubits, and find the characteristics of both static and dynamical ZZ freedoms [2]. Moreover, we demonstrate the two freedoms can be realized in one circuit with a tunable coupler so as to eliminate ZZ interaction throughout gate operations [3]. Our theory shows that using these methods the fidelity of a CR gate is able to achieve the coherence limit.References[1] J. Ku, X. Xu, M. Brink, D. C. McKay, J. B. Hertzberg, M. H. Ansari, B. L. T Plourde, Suppression of unwanted ZZ interactions in a hybrid two-qubit system. Physical Review Letters 125, 200504 (2020)[2] X. Xu and M. H. Ansari, ZZ freedom in two-qubit gates. Physical Review Applied 15, 064074 (2021)[3] X. Xu and M. H. Ansari, Parasitic free gates. In preparation
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