Helium Ion Lithography on Quantum Computing Materials
EMSL Project ID
49572
Abstract
A SQUID array (SQA) is a single electrical circuit on a chip composed of many individual SQUID loops connected in one- or two-dimensional (series, parallel, or series-parallel) configurations. Superconducting Quantum Interference Devices (SQUIDs) are comprised of tiny loops of superconducting material in which Josephson junctions are placed in the loop path. A Josephson junction (JJ) is a region of material that provides a weak link between two fully superconducting regions. High-Temperature superconducting (HTS) SQUID array (SQA) designs utilizing the CSIRO step-edge Josephson junction (JJ) method [1] have been produced and successfully tested at SSC-Pacific. Designs include two SQAs having 1020 and 54k SQUID loops connected in a 2D series/parallel configuration [2]. There exists however the potential to exploit a recent breakthrough using the ion-damaged JJ fabrication method. Using a Zeiss OrionTM Helium-Ion Microscope, Cybart et al. [3-5], have demonstrated the ability to fabricate large numbers of ion-damaged JJ's in films of YBa2Cu3O7 with large IcRn values and uniformity of junction performance across large circuit areas. We aim to reproduce our CSIRO designs, with appropriate modifications, using the helium ion-damage JJ method, thereby establishing this approach as a viable method going forward for full scale production of very large SQAs.
Project Details
Start Date
2016-11-01
End Date
2017-09-30
Status
Closed
Released Data Link
Team
Principal Investigator