Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits
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Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits. / Schmitt, Tobias W.; Connolly, Malcolm R.; Schleenvoigt, Michael; Liu, Chenlu; Kennedy, Oscar; Chavez-Garcia, Jose M.; Jalil, Abdur R.; Bennemann, Benjamin; Trellenkamp, Stefan; Lentz, Florian; Neumann, Elmar; Lindstroem, Tobias; de Graaf, Sebastian E.; Berenschot, Erwin; Tas, Niels; Mussler, Gregor; Petersson, Karl D.; Gruetzmacher, Detlev; Schueffelgen, Peter.
In: Nano Letters, Vol. 22, No. 11, 2022, p. 2595-2602.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Integration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits
AU - Schmitt, Tobias W.
AU - Connolly, Malcolm R.
AU - Schleenvoigt, Michael
AU - Liu, Chenlu
AU - Kennedy, Oscar
AU - Chavez-Garcia, Jose M.
AU - Jalil, Abdur R.
AU - Bennemann, Benjamin
AU - Trellenkamp, Stefan
AU - Lentz, Florian
AU - Neumann, Elmar
AU - Lindstroem, Tobias
AU - de Graaf, Sebastian E.
AU - Berenschot, Erwin
AU - Tas, Niels
AU - Mussler, Gregor
AU - Petersson, Karl D.
AU - Gruetzmacher, Detlev
AU - Schueffelgen, Peter
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - topological insulators
KW - Josephson junctions
KW - selective area growth
KW - stencil lithography
KW - superconducting qubits
U2 - 10.1021/acs.nanolett.1c04055
DO - 10.1021/acs.nanolett.1c04055
M3 - Journal article
C2 - 35235321
VL - 22
SP - 2595
EP - 2602
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 11
ER -
ID: 315469680