Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators
Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators
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DOI：
10.1103/physrevlett.123.190502
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发表时间：
2019-11-08
影响因子：
8.6
通讯作者：
Weides, Martin
中科院分区：
文献类型：
--
作者：
Schloer, Steffen;Lisenfeld, Juergen;Weides, Martin
我们报告了对一个高度相干的、不可调谐的超导transmon量子比特的长期测量，揭示了相干时间和量子比特跃迁频率中的低频突发噪声。我们通过同时测量量子比特的弛豫和退相速率以及其谐振频率来实现这一点。这些参数之间的相关性的分析产生的约瑟夫森量子比特的内在退相干机制的微观起源的信息。我们的结果与少数位于超导薄膜边缘的微观二能级系统相一致，这一点通过光谱噪声分析得到了进一步的证实。
We report on long-term measurements of a highly coherent, nontunable superconducting transmon qubit, revealing low-frequency burst noise in coherence times and qubit transition frequency. We achieve this through a simultaneous measurement of the qubit's relaxation and dephasing rate as well as its resonance frequency. The analysis of correlations between these parameters yields information about the microscopic origin of the intrinsic decoherence mechanisms in Josephson qubits. Our results are consistent with a small number of microscopic two-level systems located at the edges of the superconducting film, which is further confirmed by a spectral noise analysis.