Coherent dynamics and decoherence in a superconducting weak link

Coherent dynamics and decoherence in a superconducting weak link
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超导薄弱环节中的相干动力学和退相干

DOI：
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发表时间：
2016
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通讯作者：
O. Astafiev
O. Astafiev
中科院分区：
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作者：
J. Peltonen;Z. Peng;Y. Korneeva;B. M. Voronov;A. Korneev;A. Semenov;G. Goltsman;J. Tsai;O. Astafiev

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我们证明了量子化磁通量的超导回路与弱链接的相干动力学-纳米桥图案从相同的薄NbN膜的循环。桥是短的圆形收缩，接近10 nm长和20 - 30 nm宽，在其中心具有最小宽度。实现了无隧道结系统的量子态控制和受驱动时间演化的相干振荡。采用微波光谱和直接时域技术相结合的方法研究了系统中的退相干和能量弛豫。有效磁通噪声行为表明电感波动是退相干的可能原因。
We demonstrate coherent dynamics of quantized magnetic fluxes in a superconducting loop with a weak link - a nanobridge patterned from the same thin NbN film as the loop. The bridge is a short rounded shape constriction, close to 10 nm long and 20 - 30 nm wide, having minimal width at its center. Quantum state control and coherent oscillations in the driven time evolution of the tunnel-junctionless system are achieved. Decoherence and energy relaxation in the system are studied using a combination of microwave spectroscopy and direct time-domain techniques. The effective flux noise behavior suggests inductance fluctuations as a possible cause of the decoherence.