4.8 Article

Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits

期刊

NANO LETTERS
卷 22, 期 11, 页码 2595-2602

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04055

关键词

topological insulators; Josephson junctions; selective area growth; stencil lithography; superconducting qubits

资金

  1. German Federal Ministry of Education and Research (BMBF) [13N15264, SPP1666]
  2. European Union [766714/HiTIMe, 750777]
  3. UK department for Business Energy and Industrial Strategy (BEIS) through the UK national quantum technologies programme, Germany's Excellence Strategy -Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) [EXC 2004/1-390534769]
  4. Bavarian Ministry of Economic Affairs, Regional Development and Energy within Bavaria's High-Tech Agenda Project [07 02/686 58/1/21 1/22 2/23]
  5. IVF project Scalable Solid State Quantum Computing
  6. EPSRC [EP/L020963/1]
  7. German Academic Exchange Service (DAAD)
  8. Microsoft
  9. Danish National Research Foundation
  10. Marie Curie Actions (MSCA) [750777] Funding Source: Marie Curie Actions (MSCA)

向作者/读者索取更多资源

This study demonstrates the implementation of superconducting transmon qubits using topological insulator Josephson junctions. The results show the compatibility of these qubits with strong-coupling circuit quantum electrodynamics and their ability for qubit control and temporal quantum coherence.
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)(2)Te-3 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.

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