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000907777 1001_ $$0P:(DE-Juel1)171406$$aSchmitt, Tobias$$b0
000907777 245__ $$aIntegration of Topological Insulator Josephson Junctions in Superconducting Qubit Circuits
000907777 260__ $$aWashington, DC$$bACS Publ.$$c2022
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000907777 520__ $$aThe 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.
000907777 536__ $$0G:(DE-HGF)POF4-5222$$a5222 - Exploratory Qubits (POF4-522)$$cPOF4-522$$fPOF IV$$x0
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000907777 7001_ $$0P:(DE-HGF)0$$aConnolly, Malcolm R.$$b1
000907777 7001_ $$0P:(DE-Juel1)171405$$aSchleenvoigt, Michael$$b2
000907777 7001_ $$0P:(DE-HGF)0$$aLiu, Chenlu$$b3
000907777 7001_ $$0P:(DE-HGF)0$$aKennedy, Oscar$$b4
000907777 7001_ $$0P:(DE-HGF)0$$aChávez-Garcia, José M.$$b5
000907777 7001_ $$0P:(DE-Juel1)171826$$aJalil, Abdur R.$$b6
000907777 7001_ $$0P:(DE-Juel1)161192$$aBennemann, Benjamin$$b7
000907777 7001_ $$0P:(DE-Juel1)128856$$aTrellenkamp, Stefan$$b8
000907777 7001_ $$0P:(DE-Juel1)130795$$aLentz, Florian$$b9
000907777 7001_ $$0P:(DE-Juel1)156529$$aNeumann, Elmar$$b10
000907777 7001_ $$0P:(DE-HGF)0$$aLindström, Tobias$$b11
000907777 7001_ $$0P:(DE-HGF)0$$ade Graaf, Sebastian E.$$b12
000907777 7001_ $$0P:(DE-HGF)0$$aBerenschot, Erwin$$b13
000907777 7001_ $$0P:(DE-HGF)0$$aTas, Niels$$b14
000907777 7001_ $$0P:(DE-Juel1)128617$$aMussler, Gregor$$b15
000907777 7001_ $$0P:(DE-HGF)0$$aPetersson, Karl D.$$b16
000907777 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, Detlev$$b17
000907777 7001_ $$0P:(DE-Juel1)165984$$aSchüffelgen, Peter$$b18$$eCorresponding author
000907777 773__ $$0PERI:(DE-600)2048866-X$$a10.1021/acs.nanolett.1c04055$$gVol. 22, no. 7, p. 2595 - 2602$$n7$$p2595 - 2602$$tNano letters$$v22$$x1530-6984$$y2022
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