Suppression of leakage for a charge quadrupole qubit in triangular geometry

Abstract

We present a simple yet effective strategy to suppress the leakage in the charge quadrupole qubit system by having the dots in a triangle as opposed to the linear geometry originally conceived. We find that the tunnel coupling between the two outmost dots are amplified in triangular triple dots, which consequently reduces leakage by separating the leaked state and qubit states. We have 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.

11 pages, 9 figures

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Cited by in corpus (3)

• CMOS Position-Based Charge Qubits: Theoretical Analysis of Control and Entanglement
• Analytical percolation theory for topological color codes under qubit loss
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots