Procedure to tune a three-site artificial Kitaev chain to host Majorana bound states based on transmon measurements

Xiaozhou Yang; Zhaozheng Lyu; Xiang Wang; Enna Zhuo; Yunxiao Zhang; Duolin Wang; Yukun Shi; Yuyang Huang; Bing Li; Xiaohui Song; Peiling Li; Bingbing Tong; Ziwei Dou; Jie Shen; Guangtong Liu; Fanming Qu; Li Lu

doi:10.1103/2r8x-9d9m

Procedure to tune a three-site artificial Kitaev chain to host Majorana bound states based on transmon measurements

Xiaozhou Yang, Zhaozheng Lyu, Xiang Wang, Enna Zhuo, Yunxiao Zhang, Duolin Wang, Yukun Shi, Yuyang Huang, Bing Li, Xiaohui Song, Peiling Li, Bingbing Tong, Ziwei Dou, Jie Shen, Guangtong Liu, Fanming Qu, Li Lu

DOI 10.1103/2r8x-9d9m · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

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 include the tuning 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 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, in 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 the 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown