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On-chip hybrid Superconducting-Semiconducting Circuit

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Puddy, R 
Ma, P 
Yi, T 
Cao, M 

Abstract

In this paper, we experimentally demonstrate a hybrid superconducting-semiconducting (S-Sm) circuit consisting of eight planar and ballistic Nb-In0.75Ga0.25As-Nb Josephson junctions. E-beam lithography was used to fabricate the Josephson junctions on an InGaAs chip. In contrast to our previous studies on long junctions that were fabricated by photolithography, in this study, we observe the induced superconductivity in an In0.75Ga0.25As quantum well at higher temperatures, between T= 0.3 and 1.4 K (3He cryostat temperature range). The induced superconducting gap of & #x0394;ind= 0.65 meV was measured at lowest base temperature T= 300 mK. The effect of temperature and magnetic fields B on the induced superconductivity are presented. Our results suggest that our In0.75Ga0.25As heterojunctions is a promising scalable material system for quantum processing and computing applications.

Description

Keywords

Josephson junctions, quantum computing, hybrid superconductor-semiconductor junction, on-chip quantum circuits

Journal Title

IEEE Transactions on Applied Superconductivity

Conference Name

Journal ISSN

1051-8223
1558-2515

Volume Title

28

Publisher

IEEE
Sponsorship
EPSRC (EP/M009505/1)
Engineering and Physical Sciences Research Council (EP/K004077/1)
Engineering and Physical Sciences Research Council (EP/J017671/1)
Engineering and Physical Sciences Research Council (EP/M009505/1)
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