Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity
Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity
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强耦合弱非谐性超导电路中的二量子位门运算
DOI：
10.1088/1367-2630/14/7/073041
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发表时间：
2012-07-20
影响因子：
3.3
通讯作者：
Nori, Franco
中科院分区：
文献类型：
--
作者：
Lu, Xin-You;Ashhab, S.;Nori, Franco
我们从理论上研究了在两个耦合超导量子比特系统中实现双量子比特门的问题。特别地，我们分析了在耦合强度与量子比特的非谐性相当甚至更大的条件下的两量子比特门操作。通过数值求解含时薛定谔方程，在消相干可以忽略的假设下，得到了在直接和间接量子比特-量子比特耦合情况下，两量子比特门保真度与系统参数的关系.我们的数值结果可以用来确定“安全”的参数制度，在这些系统中实验实现高保真度的双量子比特门。
We theoretically study the implementation of two-qubit gates in a system of two coupled superconducting qubits. In particular, we analyze two-qubit gate operations under the condition that the coupling strength is comparable with or even larger than the anharmonicity of the qubits. By numerically solving the time-dependent Schrödinger equation under the assumption of negligible decoherence, we obtain the dependence of the two-qubit gate fidelity on the system parameters in the case of both direct and indirect qubit–qubit coupling. Our numerical results can be used to identify the ‘safe’ parameter regime for experimentally implementing two-qubit gates with high fidelity in these systems.