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We propose an effective method to optimize the working parameters (WPs) ofmicrowave-driven quantum logical gates implemented with multi-level physicalqubits. We show that by treating transitions between each pair of levelsindependently, intrinsic gate errors due primarily to population leakage toundesired states can be estimated accurately from spectroscopic properties ofthe qubits and minimized by choosing appropriate WPs. The validity andefficiency of the approach are demonstrated by applying it to optimize the WPsof two coupled rf SQUID flux qubits for controlled-NOT (CNOT) operation. Theresult of this independent transition approximation (ITA) is in good agreementwith that of dynamic method (DM). Furthermore, the ratio of the speed of ITA tothat of DM scales exponentially as 2^n when the number of qubits n increases.Comment: 4pages, 3 figure

Rapid Optimization of Working Parameters of Microwave-Driven Multilevel Qubits for Minimal Gate Leakage