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PreprintCC BY 4.0arXiv

Phase engineering of odd parity state in a quantum dot Josephson junction

  • Shohei Kobayashi
  • Tyler Lindemann
  • Sergei Gronin
  • Geoffrey Gardner
  • Peter Stano
  • Daniel Loss
  • Michael Manfra
  • Seigo Tarucha
  • Sadashige Matsuo
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Abstract

Controlling fermion parity in quantum-dot Josephson junctions (QDJJs) enables access to novel superconducting physics. While parity transitions are usually tuned electrically, we study phase-induced transitions in a strongly coupled QDJJ using the superconducting phase difference across the dot terminals, denoted by ϕ. We find that this phase allows control over the ground state parity, with parity transitions observed as the Andreev bound states (ABSs) energies crossing zero. These crossings occur near ϕ= π, and their behavior is in good correspondence to a simple model considering a single-level quantum dot proximitized by a superconductor. These results place phase-controlled QDJJ arrays as a promising platform for exploring exotic phenomena such as Majorana zero modes.

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Cite

BibTeXRIS
BibTeX
@misc{kobayashi2026phase,
  title = {{Phase engineering of odd parity state in a quantum dot Josephson junction}},
  author = {Shohei Kobayashi and Tyler Lindemann and Sergei Gronin and Geoffrey Gardner and Peter Stano and Daniel Loss and Michael Manfra and Seigo Tarucha and Sadashige Matsuo},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.26015},
  eprint = {2610.26015},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.26015},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Phase engineering of odd parity state in a quantum dot Josephson junction
AU  - Shohei Kobayashi
AU  - Tyler Lindemann
AU  - Sergei Gronin
AU  - Geoffrey Gardner
AU  - Peter Stano
AU  - Daniel Loss
AU  - Michael Manfra
AU  - Seigo Tarucha
AU  - Sadashige Matsuo
PY  - 2026
DA  - 2026/10/19
PB  - arXiv
DO  - 10.48550/arxiv.2610.26015
UR  - https://arxiv.org/abs/2610.26015
AB  - Controlling fermion parity in quantum-dot Josephson junctions (QDJJs) enables access to novel superconducting physics. While parity transitions are usually tuned electrically, we study phase-induced transitions in a strongly coupled QDJJ using the superconducting phase difference across the dot terminals, denoted by ϕ. We find that this phase allows control over the ground state parity, with parity transitions observed as the Andreev bound states (ABSs) energies crossing zero. These crossings occur near ϕ= π, and their behavior is in good correspondence to a simple model considering a single-level quantum dot proximitized by a superconductor. These results place phase-controlled QDJJ arrays as a promising platform for exploring exotic phenomena such as Majorana zero modes.
ER  -