Quantum gate operation on the single fluxonium system using nonadiabatic transitions

YOU-REN CHEN^1*, Hsiao I-Yun¹, Teranishi yoshiaki¹

¹物理所, 國立陽明交通大學, 新竹, Taiwan

* Presenter:YOU-REN CHEN, email:gigglepig123@gmail.com

Fluxonium is one of the new qubit systems achieving high coherence better than conventional superconducting qubits. The energy levels of fluxonium qubits can be controlled by an external magnetic flux as well as the total capacitance, inductive energy, and Josephson junction energy. In this study, we examine the possibility of gate operation by the sweeping of external flux, which induces nonadiabatic transition. Such an approach has already been proposed by Shuster’s group recently, and they found that the X-gate as fast as the Larmor period can be realized. We have found that faster schemes are possible by choosing the sweeping scheme, especially for heavy fluxonium. We also discuss the robustness of our schemes against noise and how to improve it.

Keywords: fluxoinum, external field, nonadabatic transitions, noise