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Microwave quantum optics with tunable cavity resonators and superconducting qubits

具有可调谐腔谐振器和超导量子位的微波量子光学

基本信息

批准号：
20F20757
负责人：
中村泰信
金额：
$ 1.41万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-07-29 至 2023-03-31
项目状态：
已结题

项目摘要

Throughout this work, we have developed a versatile CAD-assisted circuit design platform and performance estimation tools for designing JTWPAs in different variants, which can reproduce the results of implemented JTWPAs in literatures.In fabrication, we have been searching for the most suitable Josephson junction design to achieve a high homogeneity in Josephson junction parameters. From the beginning to end of the work, we have reduced the standard deviation (stdev) in junction resistance from over 20% down to 4% in our last measured sample, covering a chip area sufficient for implementing JTWPAs. Our latest junction design to be used in the next batch of JTWPA samples will further reduce the stdev to around 1%, while also greatly improving the junction yield over the previous designs.From our sample measurements, we have successfully fabricated a low-loss nonlinear transmission line which could act as the basis for JTWPAs. With a comparable electrical length and number of unit cells to JTWPAs in literatures (1413 cells in our sample, comparing to 1000-2000 cells in literatures), we have achieved < 1dB insertion loss comparing to typically 3-6 dB in most other implementations over a similar frequency range. The preliminary measurement results of our samples demonstrated a gain up to an average of 7.5 dB, over a wide bandwidth of 6 GHz. We expect future devices to catch up in terms of gain with more optimized junction and circuit designs.

在整个工作中，我们已经开发了一个通用的CAD辅助电路设计平台和性能评估工具，用于设计不同变体的JTWPAs，它可以重现文献中实现的JTWPAs的结果。在制造中，我们一直在寻找最合适的约瑟夫森结设计，以实现约瑟夫森结参数的高度均匀性。从工作的开始到结束，我们已经将结电阻的标准偏差（stdev）从超过20%降低到了最后一个测量样品的4%，覆盖了足够实现JTWPA的芯片面积。我们的最新结设计将用于下一批JTWPA样品，将进一步将标准偏差降低到1%左右，同时也大大提高了结成品率。从我们的样品测量中，我们成功地制造了一条低损耗非线性传输线，可以作为JTWPA的基础。在具有与文献中的JTWPA相当的电长度和单位单元数量的情况下（在我们的样本中为1413个单元，而文献中为1000-2000个单元），我们已经实现了< 1dB的插入损耗，而在类似的频率范围内，大多数其他实现方式中通常为3- 6dB。我们的样品的初步测量结果表明，在6 GHz的宽带宽的增益高达平均7.5 dB。我们预计未来的器件将通过更优化的结和电路设计在增益方面迎头赶上。