Qubit ZooTunable Coupler is a classical hardware coupling approach for quantum computing hardware. Source: latex text.
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 (-DRAG) for suppressing leakage in flux tunable two-qubit gates. We show that -DRAG differs fundamentally from conventional microwave implementations and derive modified flux modulation protocols that suppress leakage below 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.
Key Findings
Links
- arXiv: 2606.13052
Verification Report
Verification status: verified. Disputes resolved: 0. Citation count snapshot (Semantic Scholar): 0. Ingestion source: latex. Text truncated: no.