Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
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DOI：
10.1103/physrevapplied.10.054062
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发表时间：
2018-03
影响因子：
4.6
通讯作者：
F. Yan;P. Krantz;Youngkyu Sung;M. Kjaergaard;D. Campbell;J. Wang;T. Orlando;S. Gustavsson;W. Oliver
中科院分区：
文献类型：
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作者：
F. Yan;P. Krantz;Youngkyu Sung;M. Kjaergaard;D. Campbell;J. Wang;T. Orlando;S. Gustavsson;W. Oliver
具有量子优势的计算硬件的前景关键取决于量子门运算的质量。不完全双量子比特门是实现可扩展量子信息处理器的主要瓶颈。在这里，我们提出了一个可推广和可扩展的方案，通过调制耦合器频率来控制量子比特-量子比特耦合的双量子比特耦合器开关。双量子比特门操作可以通过在色散区操作耦合器来实现，这对量子比特状态是非侵入性的。我们通过在超导量子电路上模拟通用双量子比特门来研究该方案的性能，发现来自已知寄生效应的误差被强烈抑制。该方案与现有的高相干硬件兼容，从而有望与当前技术的更高的门保真度。
The prospect of computational hardware with quantum advantage relies critically on the quality of quantum gate operations. Imperfect two-qubit gates is a major bottleneck for achieving scalable quantum information processors. Here, we propose a generalizable and extensible scheme for a two-qubit coupler switch that controls the qubit-qubit coupling by modulating the coupler frequency. Two-qubit gate operations can be implemented by operating the coupler in the dispersive regime, which is non-invasive to the qubit states. We investigate the performance of the scheme by simulating a universal two-qubit gate on a superconducting quantum circuit, and find that errors from known parasitic effects are strongly suppressed. The scheme is compatible with existing high-coherence hardware, thereby promising a higher gate fidelity with current technologies.