Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots

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Original languageEnglish
Article number1900072
Journal / PublicationAdvanced Quantum Technologies
Issue number12
Online published24 Oct 2019
Publication statusPublished - Dec 2019


This paper presents a simple yet effective strategy to suppress the leakage in a three‐quantum‐dot charge qubit system by having the dots in a triangle as opposed to the linear geometry commonly conceived. It is found that the tunnel coupling between the two outmost dots is amplified in triangular triple dots, which consequently reduces leakage by separating the leaked state and qubit states. It has been found that the leakage can be suppressed by as much as five orders of magnitude when the dots form an equilateral triangle, with further improvement of control fidelities possible if composite pulses are applied.

Research Area(s)

  • charge qubit, semiconductor quantum-dot qubit, single-qubit operation