Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits.
Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits.
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DOI：
10.1021/acs.nanolett.1c04055
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发表时间：
2020-07
期刊：
影响因子：
10.8
通讯作者：
T. Schmitt;M. Connolly;Michael Schleenvoigt;Chenlu Liu;O. Kennedy;Jos'e M. Ch'avez-Garcia;Abdur Rehman Jalil;B. Bennemann;S. Trellenkamp;F. Lentz;E. Neumann;T. Lindstrom;S. D. Graaf;E. Berenschot;N. Tas;G. Mussler;K. Petersson;D. Grutzmacher;P. Schuffelgen
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文献类型：
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作者：
T. Schmitt;M. Connolly;Michael Schleenvoigt;Chenlu Liu;O. Kennedy;Jos'e M. Ch'avez-Garcia;Abdur Rehman Jalil;B. Bennemann;S. Trellenkamp;F. Lentz;E. Neumann;T. Lindstrom;S. D. Graaf;E. Berenschot;N. Tas;G. Mussler;K. Petersson;D. Grutzmacher;P. Schuffelgen
半导体约瑟夫森结（JJ）在超导量子电路中的集成为混合量子比特提供了一个通用的平台，并提供了一个强大的方式来探测奇异的准粒子激发。最近的建议，使用电路量子电动力学（cQED）来检测拓扑超导激励集成的新拓扑材料在这样的电路。在这里，我们报告的实现超导transmon量子比特实现与（Bi 0.06Sb 0.94）2 Te 3拓扑绝缘体（TI）的JJ使用双真空制造技术。我们的基板上的微波损耗，主机单片集成硬掩模用于TI纳米结构的选择性区域生长，意味着微秒限制弛豫时间，因此，它们与强耦合cQED的兼容性。我们使用腔-量子比特相互作用来表明基于TI的transmons的约瑟夫森能量与它们的JJ维度成比例，并展示量子比特控制以及时间量子相干性。我们的结果铺平了道路，先进的研究拓扑材料在这两个新的约瑟夫森和拓扑量子比特。
The integration of semiconductor Josephson junctions (JJs) in superconducting quantum circuits provides a versatile platform for hybrid qubits and offers a powerful way to probe exotic quasiparticle excitations. Recent proposals for using circuit quantum electrodynamics (cQED) to detect topological superconductivity motivate the integration of novel topological materials in such circuits. Here, we report on the realization of superconducting transmon qubits implemented with (Bi0.06Sb0.94)2Te3 topological insulator (TI) JJs using ultrahigh vacuum fabrication techniques. Microwave losses on our substrates, which host monolithically integrated hardmasks used for the selective area growth of TI nanostructures, imply microsecond limits to relaxation times and, thus, their compatibility with strong-coupling cQED. We use the cavity-qubit interaction to show that the Josephson energy of TI-based transmons scales with their JJ dimensions and demonstrate qubit control as well as temporal quantum coherence. Our results pave the way for advanced investigations of topological materials in both novel Josephson and topological qubits.