Longobardi Luigi, Bennett Douglas A, Patel Vijay, Chen Wei, Lukens James E
American Physical Society, 1 Research Road, Ridge, New York 11961, USA.
Rev Sci Instrum. 2013 Jan;84(1):014706. doi: 10.1063/1.4789310.
Careful filtering is necessary for observations of quantum phenomena in superconducting circuits at low temperatures. Measurements of coherence between quantum states require extensive filtering to protect against noise coupled from room temperature electronics. We demonstrate distributed transmission line filters which cut off exponentially at GHz frequencies and can be anchored at the base temperature of a dilution refrigerator. The compact design makes them suitable to filter many different bias lines in the same setup, necessary for the control and measurement of superconducting qubits.
在低温下对超导电路中的量子现象进行观测时，仔细滤波是必要的。量子态之间的相干性测量需要进行大量滤波，以防止来自室温电子设备的噪声耦合。我们展示了分布式传输线滤波器，其在GHz频率下呈指数衰减截止，并且可以固定在稀释制冷机的基温下。这种紧凑的设计使其适用于在同一装置中对许多不同的偏置线进行滤波，这对于超导量子比特的控制和测量是必要的。
