Simple analytical flux-tuned iSWAP pulses for leakage suppression

• URL: http://arxiv.org/abs/2606.13052v1
• Date: Thu, 11 Jun 2026 08:34:58 GMT
• Title: Simple analytical flux-tuned iSWAP pulses for leakage suppression
• Abstract summary: We present an analytical flux control method enabling derivative removal by adiabatic gate ($$-DRAG) for suppressing leakage in tunable flux two-qubit gates.<n>The method remains effective across a range of asymmetry between qubit anharmonicities and different circuit parameters, enabling high-fidelity two-qubit gates within the fifteen nanosecond range.
• Score: 0.15393457051344298
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fast, high-fidelity two-qubit gates are a key requirement for fault-tolerant quantum computation. Tunable coupler architectures provide a flexible approach for implementing entangling gates through flux control with large on-off ratios, but fast flux modulation can induce diabatic transitions and population leakage to non-computational states, limiting gate performance. Here we present an analytical flux control method enabling derivative removal by adiabatic gate ($Φ$-DRAG) for suppressing leakage in flux tunable two-qubit gates. We show that $Φ$-DRAG differs fundamentally from conventional microwave implementations and derive modified flux modulation protocols that suppress leakage below $10^{-4}$ for fast entangling gates. The method remains effective across a range of asymmetry between qubit anharmonicities and different circuit parameters, enabling high-fidelity two-qubit gates within the fifteen nanosecond range.

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