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Evidence of topological superconductivity in planar Josephson junctions.
Fornieri, Antonio; Whiticar, Alexander M; Setiawan, F; Portolés, Elías; Drachmann, Asbjørn C C; Keselman, Anna; Gronin, Sergei; Thomas, Candice; Wang, Tian; Kallaher, Ray; Gardner, Geoffrey C; Berg, Erez; Manfra, Michael J; Stern, Ady; Marcus, Charles M; Nichele, Fabrizio.
Afiliação
  • Fornieri A; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen and Microsoft Quantum Lab Copenhagen, Copenhagen, Denmark.
  • Whiticar AM; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen and Microsoft Quantum Lab Copenhagen, Copenhagen, Denmark.
  • Setiawan F; James Franck Institute, The University of Chicago, Chicago, IL, USA.
  • Portolés E; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen and Microsoft Quantum Lab Copenhagen, Copenhagen, Denmark.
  • Drachmann ACC; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen and Microsoft Quantum Lab Copenhagen, Copenhagen, Denmark.
  • Keselman A; Station Q, Microsoft Research, Santa Barbara, CA, USA.
  • Gronin S; Department of Physics and Astronomy and Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, IN, USA.
  • Thomas C; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Wang T; Department of Physics and Astronomy and Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, IN, USA.
  • Kallaher R; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Gardner GC; Department of Physics and Astronomy and Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, IN, USA.
  • Berg E; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Manfra MJ; Department of Physics and Astronomy and Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, IN, USA.
  • Stern A; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
  • Marcus CM; Department of Physics and Astronomy and Microsoft Quantum Lab Purdue, Purdue University, West Lafayette, IN, USA.
  • Nichele F; Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
Nature ; 569(7754): 89-92, 2019 05.
Article em En | MEDLINE | ID: mdl-31019303
Majorana zero modes-quasiparticle states localized at the boundaries of topological superconductors-are expected to be ideal building blocks for fault-tolerant quantum computing1,2. Several observations of zero-bias conductance peaks measured by tunnelling spectroscopy above a critical magnetic field have been reported as experimental indications of Majorana zero modes in superconductor-semiconductor nanowires3-8. On the other hand, two-dimensional systems offer the alternative approach of confining Majorana channels within planar Josephson junctions, in which the phase difference φ between the superconducting leads represents an additional tuning knob that is predicted to drive the system into the topological phase at lower magnetic fields than for a system without phase bias9,10. Here we report the observation of phase-dependent zero-bias conductance peaks measured by tunnelling spectroscopy at the end of Josephson junctions realized on a heterostructure consisting of aluminium on indium arsenide. Biasing the junction to φ ≈ π reduces the critical field at which the zero-bias peak appears, with respect to φ = 0. The phase and magnetic-field dependence of the zero-energy states is consistent with a model of Majorana zero modes in finite-size Josephson junctions. As well as providing experimental evidence of phase-tuned topological superconductivity, our devices are compatible with superconducting quantum electrodynamics architectures11 and are scalable to the complex geometries needed for topological quantum computing9,12,13.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Nature Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Dinamarca

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Nature Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Dinamarca