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arXiv 2007.04224cond-mat.mes-hallcond-mat.mtrl-scicond-mat.supr-conquant-ph
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超导量子比特电路中拓扑绝缘体约瑟夫森结的集成

Integration of topological insulator Josephson junctions in superconducting qubit circuits

Tobias W. Schmitt, Malcolm R. Connolly, Michael Schleenvoigt, Chenlu Liu, Oscar Kennedy, José M. Chávez-Garcia, Abdur R. Jalil, Benjamin Bennemann, Stefan Trell… 展开作者

Tobias W. Schmitt, Malcolm R. Connolly, Michael Schleenvoigt, Chenlu Liu, Oscar Kennedy, José M. Chávez-Garcia, Abdur R. Jalil, Benjamin Bennemann, Stefan Trellenkamp, Florian Lentz, Elmar Neumann, Tobias Lindström, Sebastian E. de Graaf, Erwin Berenschot, Niels Tas, Gregor Mussler, Karl D. Petersson, Detlev Grützmacher, Peter Schüffelgen

摘要:

将半导体约瑟夫森结(JJ)集成到超导量子线路中,为混合量子比特提供了一个通用的平台,并提供了一种强有力的方法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量子比特与$(Bi_{0.06}Sb_{0.94})_{2}Te_{3}$拓扑绝缘体(TI)的JJ使用超高真空制造技术。我们的衬底上的微波损耗与单片集成的硬掩模,用于选择性区域生长的TI纳米结构,意味着微秒限制弛豫时间,从而与强耦合cQED的兼容性。我们使用腔-量子比特相互作用来证明基于TI的transmons的约瑟夫森能量与它们的JJ维度成比例,并证明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。

英文摘要:

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 $(Bi_{0.06}Sb_{0.94})_{2}Te_{3}$ topological insulator (TI) JJs using ultra-high vacuum fabrication techniques. Microwave losses on our substrates with monolithically integrated hardmask, used for 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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