Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 14: QIP Implementations: Solid-State Devices I
MON 14.5: Talk
Monday, September 8, 2025, 17:30–17:45, ZHG002
Passive leakage removal unit based on a disordered transmon array — •Gonzalo Martín-Vázquez1,2, Taneli Tolppanen2, and Matti Silveri2 — 1Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Seville, Spain — 2Nano and Molecular Systems Research Unit, University of Oulu, FI-90014 Oulu, Finland
Leakage out from the qubit subspace compromises standard quantum error correction protocols and poses a challenge for practical quantum computing. We propose a passive leakage removal unit based on an array of coupled disordered transmons and last-site reset by feedback-measurement or dissipation. We find that the unit effectively removes leakage with minimal effect to the qubit subspace by taking advantage of energy level disorder for qubit subspace and resonant leakage energy levels. There are two optimal measurement rates for removing leakage, which we show analytically to correspond to characteristic time scales of leakage propagation and disintegration in the system. The performance of the leakage removal unit depends on the strength of disorder, coupling between the transmons, and the length of the array. We simulate the system under experimentally feasible parameters and present an optimal configuration. Our approach is readily compatible with existing superconducting quantum processors considering realistic conditions.
Keywords: Open quantum systems & decoherence; Quantum error correction; Quantum measurements; Quantum many-body systems; Superconducting qubits