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Epitaxy of advanced nanowire quantum devices

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Author: Gazibegovic, S. · Car, D. · Zhang, H. · Balk, S.C. · Logan, J.A. · Moor, M.W.A. de · Cassidy, M.C. · Schmits, R. · Xu, D. · Wang, G. · Krogstrup, P. · Veld, R.L.M. op het · Zuo, K. · Vos, Y. · Shen, J. · Bouman, D. · Shojaei, B. · Pennachio, D. · Lee, J.S. · Veldhoven, P.J. van · Koelling, S. · Verheijen, M.A. · Kouwenhoven, L.P. · Palmstrøm, C.J. · Bakkers, E.P.A.M.
Source:Nature, 7668, 548, 434-438
Identifier: 780728
Keywords: Nanotechnology · High Tech Systems & Materials · Industrial Innovation · Nano Technology · NI - Nano Instrumentation · TS - Technical Sciences


Semiconductor nanowires are ideal for realizing various low-dimensional quantum devices. In particular, topological phases of matter hosting non-Abelian quasiparticles (such as anyons) can emerge when a semiconductor nanowire with strong spin-orbit coupling is brought into contact with a superconductor. To exploit the potential of non-Abelian anyons - which are key elements of topological quantum computing - fully, they need to be exchanged in a well-controlled braiding operation. Essential hardware for braiding is a network of crystalline nanowires coupled to superconducting islands. Here we demonstrate a technique for generic bottom-up synthesis of complex quantum devices with a special focus on nanowire networks with a predefined number of superconducting islands. Structural analysis confirms the high crystalline quality of the nanowire junctions, as well as an epitaxial superconductor-semiconductor interface. Quantum transport measurements of nanowire 'hashtags' reveal Aharonov-Bohm and weak-antilocalization effects, indicating a phase-coherent system with strong spin-orbit coupling. In addition, a proximity-induced hard superconducting gap (with vanishing sub-gap conductance) is demonstrated in these hybrid superconductor-semiconductor nanowires, highlighting the successful materials development necessary for a first braiding experiment. Our approach opens up new avenues for the realization of epitaxial three-dimensional quantum architectures which have the potential to become key components of various quantum devices.