| AVS 66th International Symposium & Exhibition | |
| Materials and Processes for Quantum Information, Computing and Science Focus Topic | Monday Sessions |
| Session QS+EM+MN+NS+VT-MoA |
| Session: | Systems and Devices for Quantum Computing |
| Presenter: | Mustafa Bal, National Institute of Standards and Technology (NIST) |
| Authors: | M. Bal, National Institute of Standards and Technology (NIST) J.L. Long, National Institute of Standards and Technology (NIST) R. Zhao, National Institute of Standards and Technology (NIST) H. Wang, National Institute of Standards and Technology (NIST) C.R. McRae, National Institute of Standards and Technology (NIST) and University of Colorado Boulder R.E. Lake, National Institute of Standards and Technology (NIST) X. Wu, National Institute of Standards and Technology (NIST) H.-S. Ku, National Institute of Standards and Technology (NIST) D.P. Pappas, National Institute of Standards and Technology (NIST) |
| Correspondent: | Click to Email |
Quantum limited amplifiers have become indispensable tools in superconducting quantum circuits. In recent years, quantum limited amplification has been demonstrated in parametric amplifiers based on high kinetic inductance superconductors as well as Josephson junctions. Previously, we have demonstrated submicron scale overlap Josephson junction fab process for qubits with long coherence times [1]. Here, we extend the overlap junction fab process to micron scale junctions to enable the realization of other superconducting quantum devices such as overlap junction-based Josephson parametric amplifiers (O-JPA). Our fab scheme yield frequency tunable O-JPAs with negligible insertion loss. We readily observe over 25 dB gain. Compared to other competing processes, overlap junction process for micron scale junctions allows the fabrication of O-JPAs with high yield and good device performance at a much lower infrastructure requirements. The fabrication details of overlap junction process as well as the results of O-JPA characterization will be presented. The metrology of overlap Josephson junctions will also be presented in this this symposium [2].
[1] X. Wu, J. L. Long, H. S. Ku, R. E. Lake, M. Bal, and D. P. Pappas, “Overlap junctions for high coherence superconducting qubits”, Appl. Phys. Lett. 111, 032602 (2017).
[2] R. Zhao et al., “Josephson Junction metrology for superconducting quantum device design”, also presented at AVS 66th International Symposium & Exhibition.