Read out the fermion parity of a potential artificial Kitaev chain utilizing a transmon qubit

• URL: http://arxiv.org/abs/2501.13367v1
• Date: Thu, 23 Jan 2025 04:14:55 GMT
• Title: Read out the fermion parity of a potential artificial Kitaev chain utilizing a transmon qubit
• Authors: Enna Zhuo, Xiaozhou Yang, Yuyang Huang, Zhaozheng Lyu, Ang Li, Bing Li, Yunxiao Zhang, Xiang Wang, Duolin Wang, Yukun Shi, Anqi Wang, E. P. A. M. Bakkers, Xiaodong Han, Xiaohui Song, Peiling Li, Bingbing Tong, Ziwei Dou, Guangtong Liu, Fanming Qu, Jie Shen, Li Lu,
• Abstract summary: We demonstrate the feasibility of using a superconducting transmon qubit, which incorporates an end of a four-site quantum dot-superconductor chain based on a Ge/Si nanowire. We show that the inter-dot coupling, hence the strengths of cross Andreev reflection and elastic cotunneling of electrons, can be adjusted by local electrostatic gating in chains fabricated on Ge/Si core-shell nanowires.
• Score: 17.62661527215912
• License:
• Abstract: Artificial Kitaev chains have emerged as a promising platform for realizing topological quantum computing. Once the chains are formed and the Majorana zero modes are braided/fused, reading out the parity of the chains is essential for further verifying the non-Abelian property of the Majorana zero modes. Here we demonstrate the feasibility of using a superconducting transmon qubit, which incorporates an end of a four-site quantum dot-superconductor chain based on a Ge/Si nanowire, to directly detect the singlet/doublet state, and thus the parity of the entire chain. We also demonstrate that for multiple-dot chains there are two types of 0-{\pi} transitions between different charging states: the parity-flip 0-{\pi} transition and the parity-preserved 0-{\pi} transition. Furthermore, we show that the inter-dot coupling, hence the strengths of cross Andreev reflection and elastic cotunneling of electrons, can be adjusted by local electrostatic gating in chains fabricated on Ge/Si core-shell nanowires. Our exploration would be helpful for the ultimate realization of topological quantum computing based on artificial Kitaev chains.

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