Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits
Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits
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DOI：
10.1103/physrevx.7.041043
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发表时间：
2017-11-22
影响因子：
12.5
通讯作者：
Lehnert, K. W.
中科院分区：
文献类型：
--
作者：
Chapman, Benjamin J.;Rosenthal, Eric I.;Lehnert, K. W.
我们报告的设计和性能的片上微波环行器具有广泛（GHz）可调谐的工作频率。非互易性是通过频率转换和延迟的组合来创建的，并且既不需要永磁体也不需要微波偏置音调，允许与其他超导电路进行片上集成，而不需要高带宽控制线。该器件的隔离度在数十MHz的带宽内超过20 dB，并且其插入损耗很小，在选定的工作频率下可低至0.9 dB。此外，对于高达数百fW（近似10（3）个循环光子）的信号功率，该器件相对于输入功率是线性的，并且循环的方向可以动态地重新配置。我们展示了它的操作在4和6 GHz之间的频率选择。
We report on the design and performance of an on-chip microwave circulator with a widely (GHz) tunable operation frequency. Nonreciprocity is created with a combination of frequency conversion and delay, and requires neither permanent magnets nor microwave bias tones, allowing on-chip integration with other superconducting circuits without the need for high-bandwidth control lines. Isolation in the device exceeds 20 dB over a bandwidth of tens of MHz, and its insertion loss is small, reaching as low as 0.9 dB at select operation frequencies. Furthermore, the device is linear with respect to input power for signal powers up to hundreds of fW (approximate to 10(3) circulating photons), and the direction of circulation can be dynamically reconfigured. We demonstrate its operation at a selection of frequencies between 4 and 6 GHz.