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Procedure of tuning up a three-site artificial Kitaev chain based on transmon measurements

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arxiv 2505.15317 v1 pith:NKRXQJNY submitted 2025-05-21 cond-mat.mes-hall quant-ph

Xiaozhou Yang , Zhaozheng Lyu , Xiang Wang , Enna Zhuo , Yunxiao Zhang , Duolin Wang , Yukun Shi , Yuyang Huang
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Bing Li Xiaohui Song Peiling Li Bingbing Tong Ziwei Dou Jie Shen Guangtong Liu Fanming Qu Li Lu
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classification cond-mat.mes-hallquant-ph
keywords spotssweetchainmbssthree-sitetransmontuningakcs
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Artificial Kitaev chains (AKCs), formed of quantum dot-superconductor linear arrays, provide a promising platform for hosting Majorana bound states (MBSs) and implementing topological quantum computing. The main challenges along this research direction would include the tuning up of AKCs for hosting MBSs and the readout of the parity of the chains. In this work, we present a step-by-step procedure for tuning up a three-site AKC to its sweet spots based on the spectra of a transmon circuit which is integrated with the chain for the purpose of reading out the parity of the chain. The signatures of the transmon's plasma modes in each step, particular those related to the appearance of MBSs in the chain, will be given. We find that the sweet spots in a three-site AKC can be classified into three types based on the relative strengths of elastic cotunneling (ECT) and crossed Andreev reflection (CAR): ECT-dominated sweet spots, genuine sweet spots and CAR-dominated sweet spots. We show that the ECT-dominated and CAR-dominated sweet spots can be more conveniently accessed and utilized in transmon-based measurements.

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  1. Entanglement dynamics in minimal Kitaev chains

    quant-ph 2025-07 reject novelty 5.0 of 10

    Two- and three-site Kitaev chains can dynamically generate maximally entangled two-qubit and GHZ-type three-qubit states, while a pure W state is forbidden by parity conservation.

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