Single-Flux-Quantum-Activated Controlled-Z Gate for Transmon Qubits
Y.F. Wang, W.P. Gao, K. Liu, B. Ji, Z. Wang, Z.R. Lin
DOI 10.1103/PhysRevApplied.19.044031 · Physical Review Applied
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Abstract
Single-flux-quantum (SFQ) digital circuitry has great potential in building a scalable control system of superconducting qubits. In this work, we describe a practical SFQ-based two-qubit gate for transmon qubits. The controlled-Z (CZ) gate is activated by near-resonant SFQ-pulse trains near the target transition involving the second excited state. Numerical simulations show that the fidelity of a SFQ-activated CZ gate in excess of 99.9% is achievable within 100-ns gate time. We evaluate the CZ gate error caused by leakage and SFQ-pulse width. Combined with the proposed feasible expansion methods, this work is a supplement to the scalable and integratable superconducting-qubit control system based on SFQ digital logic.
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