Optimizing anharmonicity in nanoscale weak link Josephson junction oscillators.
Optimizing anharmonicity in nanoscale weak link Josephson junction oscillators.
复制标题
优化纳米级弱连接约瑟夫森结振荡器的非谐性。
DOI：
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发表时间：
2009
影响因子：
8.6
通讯作者：
I. Siddiqi
中科院分区：
文献类型：
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作者：
R Patil Vijay;J. Sau;M. Cohen;I. Siddiqi
我们计算超导薄弱环节的电流相位关系，其尺寸与零温度相干长度相当，连接到二维和三维超导电极。我们的结果表明，具有三维组的 50-100 nm 长的铝纳米桥具有足够的非谐性来实现低噪声放大器和量子比特。因此，由于不存在有损氧化层，这种弱连接结为实现敏感量子电路提供了一条实用的新途径，其质量因数可能比隧道结器件更高。
We compute the current phase relation for superconducting weak links, with dimensions comparable to the zero temperature coherence length, connected to two and three dimensional superconducting electrodes. Our results indicate that 50-100 nm long aluminum nanobridges with three dimensional banks have sufficient anharmonicity for realizing low noise amplifiers and quantum bits. Such weak link junctions thus present a practical new route for realizing sensitive quantum circuits with potentially higher quality factor than tunnel junction devices due to the absence of a lossy oxide layer.