Anharmonicity of a superconducting qubit with a few-mode Josephson junction
Anharmonicity of a superconducting qubit with a few-mode Josephson junction
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DOI：
10.1103/physrevb.97.060508
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发表时间：
2018-02-21
影响因子：
3.7
通讯作者：
Marcus, C. M.
中科院分区：
文献类型：
--
作者：
Kringhoj, A.;Casparis, L.;Marcus, C. M.
基于半导体纳米线的栅压控制的混合transmon量子比特（gatemons）的相干操作最近被证明。在这里，我们实验研究的非谐性在外延InAs-Al约瑟夫森结，一个关键参数，他们作为一个量子比特的使用。与传统金属结相比，非谐性被发现降低了大约2倍，并且取决于栅极电压。实验结果与理论模型一致，表明约瑟夫森耦合是由半导体结中的少数高透射模式介导的。
Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the anharmonicity in epitaxial InAs-Al Josephson junctions, a key parameter for their use as a qubit. Anharmonicity is found to be reduced by roughly a factor of 2 compared to conventional metallic junctions and dependent on gate voltage. Experimental results are consistent with a theoretical model, indicating that Josephson coupling is mediated by a small number of highly transmitting modes in the semiconductor junction.