二能级系统涨落子的现实量子操纵
Realistic quantum manipulation of two-level system fluctuators
摘要：
超导器件中的二能级系统涨落器已经证明了与超导量子比特的相干耦合。在这里，我们表明，通用的量子逻辑门可以实现在这些两个层次的系统，仅通过调谐超导谐振器，他们被嵌入。由于涨落子之间的能量分离很大，因此广泛用于固态量子比特的腔QED方法中的传统门方案不能直接应用于涨落子。我们研究了一种方案，通过利用超导谐振器的可控性与现实的参数进行门操作。数值模拟表明，考虑到谐振腔模式的衰减，量子逻辑门可以实现高保真度在适度的谐振腔衰减率。量子逻辑门也可以在由超导回路连接的不同约瑟夫森结内的波动器之间实现。我们的方案可以用来研究二能级系统涨落与超导谐振腔的耦合以及涨落的相干特性。
英文摘要：
Two-level system fluctuators in superconducting devices have demonstrated coherent coupling with superconducting qubits. Here, we show that universal quantum logic gates can be realized in these two-level systems solely by tuning a superconducting resonator in which they are imbedded. Because of the large energy separation between the fluctuators, conventional gate schemes in the cavity QED approach that are widely used for solid-state qubits cannot be directly applied to the fluctuators. We study a scheme to perform the gate operations by exploiting the controllability of the superconducting resonator with realistic parameters. Numerical simulation that takes into account the decay of the resonator mode shows that the quantum logic gates can be realized with high fidelity at moderate resonator decay rate. The quantum logic gates can also be realized between fluctuators inside different Josephson junctions that are connected by a superconducting loop. Our scheme can be applied to explore the coupling between two-level system fluctuators and superconducting resonators as well as the coherent properties of the fluctuators.
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