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Related Experiment Video

Updated: Feb 8, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

A zero-dimensional topologically nontrivial state in a superconducting quantum dot.

Pasquale Marra¹, Alessandro Braggio², Roberta Citro³

¹RIKEN Center for Emergent Matter Science, Wakoshi, Saitama 351-0198, Japan.

Beilstein Journal of Nanotechnology

|July 7, 2018

Summary

We demonstrate a zero-dimensional topological superconductor using a quantum dot. Topological phase transitions are revealed by current discontinuities, indicating broken time-reversal symmetry.

Keywords:

Josephson effect Josephson junctions quantum dots superconducting quantum dots topological states topological superconductors

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Area of Science:

Condensed Matter Physics
Quantum Phenomena
Topological Matter

Background:

Topological states of matter are classified by symmetries and dimensionality.
Nontrivial topological states can exist in zero-dimensional systems with discrete energy spectra.

Purpose of the Study:

To realize a nontrivial zero-dimensional topological superconductor.
To investigate topological phase transitions in such systems.

Main Methods:

Coupling a quantum dot with two superconducting leads.
Analyzing the system's properties at zero temperature.

Main Results:

A quantum dot system realizes a zero-dimensional topological superconductor with broken time-reversal symmetry.
Topological phase transitions involve changes in fermion parity.
Zero-energy modes and current-phase relation discontinuities signal these transitions.

Conclusions:

Fermion parity transitions can be detected via current discontinuities.
Measuring critical current at low temperatures can reveal topological phase transitions.