On-chip hybrid superconducting-semiconducting quantum circuit

Delfanazari, K. et al. (2018) On-chip hybrid superconducting-semiconducting quantum circuit. IEEE Transactions on Applied Superconductivity, 28(4), 1100304. (doi: 10.1109/TASC.2018.2812817)

Abstract

In this paper, we experimentally demonstrate a hybrid superconducting-semiconducting circuit consisting of eight planar and ballistic Nb-In 0.75 Ga 0.25 As-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 In 0.75 Ga 0.25 As quantum well at higher temperatures, between T = 0.3 and 1 K ( 3 He cryostat temperature range). The induced superconducting gap of Δ 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 In 0.75 Ga 0.25 As heterostructure is a promising scalable material system for quantum processing and computing applications.

• Item Type: Articles
• Additional Information: This work was supported by the Engineering and Physical Sciences Research Council Grants EP/M009505/1 and EP/J017671/1.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Delfanazari, Dr Kaveh
• Authors: Delfanazari, K., Kelly, M. J., Smith, C. G., Puddy, R. K., Ma, P., Yi, T., Cao, M., Richardson, C., Farrer, I., Ritchie, D. A., and Joyce, H. J.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Transactions on Applied Superconductivity
• Publisher: IEEE
• ISSN: 1051-8223
• ISSN (Online): 1558-2515
• Published Online: 06 March 2018
• Copyright Holders: Copyright © 2018 IEEE
• First Published: First published in IEEE Transactions on Applied Superconductivity 28(4):1100304
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher
• Data DOI: https://doi-org.ezproxy.lib.gla.ac.uk/10.17863/CAM.20606