Protecting superconducting qubits from radiation
Protecting superconducting qubits from radiation
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DOI：
10.1063/1.3658630
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发表时间：
2011-10-31
影响因子：
4
通讯作者：
Steffen, M.
中科院分区：
文献类型：
--
作者：
Corcoles, Antonio D.;Chow, Jerry M.;Steffen, M.
我们描述了超导量子比特及其封装在吸收介质中嵌入前后的特性。我们观察到有效量子比特温度的显著提高和驰豫时间的十倍以上，最高可达5.7µS。我们的结果表明，低温装置内的外部辐射的存在可能是量子比特初始化和相干的限制因素。计算支持这样的假设，即弛豫不受嵌入前热光子与量子比特的直接耦合的限制，而是受准粒子产生的耗散的限制。(C)2011年美国物理研究所。[DOI：10.1063/1.3658630]
We characterize a superconducting qubit before and after embedding it along with its package in an absorptive medium. We observe a drastic improvement in the effective qubit temperature and over a tenfold improvement in the relaxation time up to 5.7 mu s. Our results suggest the presence of external radiation inside the cryogenic apparatus can be a limiting factor for both qubit initialization and coherence. Calculations support the hypothesis that the relaxation is not limited by direct coupling of thermal photons to the qubit prior to embedding, but by dissipation arising from quasiparticle generation. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3658630]