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arXiv 0911.4657quant-phcond-mat.mes-hall
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一维和二维电路量子电动力学的最优控制

Optimal control of circuit quantum electrodynamics in one and two dimensions

R. Fisher, F. Helmer, S. J. Glaser, F. Marquardt, T. Schulte-Herbrueggen

摘要:

在基于超导电路量子电动力学的量子信息处理硬件架构中,最优控制可以显著改善多量子比特门的性能。我们不仅将这种方法应用于腔内两个量子比特的色散门,而且更普遍地应用于基于腔和量子比特的二维阵列的架构。对于高保真度的门操作,控制和耦合在两个耦合维度的腔网格的同时演变被证明是显着快于传统的顺序实现。即使在实验现实的条件下,也可以获得三倍的加速。这些方法立即扩展到大网格和网格上任意量子位对之间的间接门。它们预计将成为可控量子位的2D阵列和晶格的典范。

英文摘要:

Optimal control can be used to significantly improve multi-qubit gates in quantum information processing hardware architectures based on superconducting circuit quantum electrodynamics. We apply this approach not only to dispersive gates of two qubits inside a cavity, but, more generally, to architectures based on two-dimensional arrays of cavities and qubits. For high-fidelity gate operations, simultaneous evolutions of controls and couplings in the two coupling dimensions of cavity grids are shown to be significantly faster than conventional sequential implementations. Even under experimentally realistic conditions speedups by a factor of three can be gained. The methods immediately scale to large grids and indirect gates between arbitrary pairs of qubits on the grid. They are anticipated to be paradigmatic for 2D arrays and lattices of controllable qubits.

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