Flux-tunable Josephson effect in a four-terminal junction

Prosko, Christian G.; Huisman, Wietze D.; Kulesh, Ivan; Xiao, Di; Thomas, Candice; Manfra, Michael J.; Goswami, Srijit

doi:10.1103/physrevb.110.064518

Phys. Rev. B

2024

DOI: 10.1103/physrevb.110.064518

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Flux-tunable Josephson effect in a four-terminal junction

Christian G. Prosko,

Wietze D. Huisman,

Ivan Kulesh

et al.

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Flux-tunable Kitaev chain in a quantum dot array

Torres Luna,

Bozkurt,

Wimmer

et al. 2024

SciPost Phys. Core

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Connecting quantum dots through Andreev bound states in a semiconductor-superconductor hybrid provides a platform to create a Kitaev chain. Interestingly, in a double quantum dot, a pair of poor man’s Majorana zero modes can emerge when the system is fine-tuned to a sweet spot, where superconducting and normal couplings are equal in magnitude. Control of the Andreev bound states is crucial for achieving this, usually implemented by varying its chemical potential. In this work, we propose using Andreev bound states in a short Josephson junction to mediate both types of couplings, with the ratio tunable by the phase difference across the junction. Now a minimal Kitaev chain can be easily tuned into the strong coupling regime by varying the phase and junction asymmetry, even without changing the dot-hybrid coupling strength. Furthermore, we identify an optimal sweet spot at \piπ phase, enhancing the excitation gap and robustness against phase fluctuations. Our proposal introduces a new device platform and a new tuning method for realizing quantum-dot-based Kitaev chains.

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Flux-tunable Kitaev chain in a quantum dot array

Torres Luna,

Bozkurt,

Wimmer

et al. 2024

SciPost Phys. Core

View full text Add to dashboard Cite

show abstract

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Flux-tunable Josephson effect in a four-terminal junction

Cited by 1 publication

References 56 publications

Flux-tunable Kitaev chain in a quantum dot array

Flux-tunable Kitaev chain in a quantum dot array

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