Novel Devices

• Development of Microwave Kinetic Inductance Detectors (MKIDs) based on Ti/TiN/Ti multilayers. This technology was developed from conception through to the fabrication of large-format sensor arrays for the BLAST-TNG balloon mission [8]. Our Ti/TiN/Ti based single photon counting detectors have also achieved the best MKID energy resolution at 1550nm near-infrared wavelength [3].
• Novel designs for broadband quantum-limited traveling-wave parametric amplifiers based on high kinetic inductance materials reduce the physical size and pump power of these promising devices [4].
• Novel tunable resonator [5] and tunable coupler [7] devices based on nonlinear kinetic inductance show great promise in the readout and control of quantum circuits.
• Novel LED pixel-to-frequency mapper tool [2] and post-measurement lithographic correction technique [1] achieve perfect yield in kinetic inductance detector arrays.
• Reinvention of superconducting cryotron circuits using modern microfabrication techniques to perform a range of switching functions at milliKelvin temperatures [6].

Recent Publications

1. “Superconducting micro-resonator arrays with ideal frequency spacing”, X. Liu, W. Guo, Y. Wang, M. Dai, L. F. Wei, B. Dober, C. M. McKenney, G. C. Hilton, J. Hubmayr, J. E. Austermann, J. N. Ullom, J. Gao, and M. R. Vissers, Appl. Phys. Lett. 111, 252601 (2017); https://doi.org/10.1063/1.5016190
2. “Cryogenic LED pixel-to-frequency mapper for kinetic inductance detector arrays”, X. Liu, W. Guo, Y. Wang, L. F. Wei, C. M. Mckenney, B. Dober, T. Billings, J. Hubmayr, L. S. Ferreira, M. R. Vissers, and J. Gao, J. Appl., Phys. 122, 034502 2017); https://doi.org/10.1063/1.4994170
3. “Counting near infrared photons with microwave kinetic inductance detectors”, W. Guo, X. Liu, Y. Wang, Q. Wei, L. F. Wei, J. Hubmayr, J. Fowler, J. Ullom, L. Vale, M. R. Vissers, and J. Gao, Appl. Phys. Lett. 110, 212601 (2017); https://doi.org/10.1063/1.4984134.
4.  “Broadband parametric amplifiers based on nonlinear kinetic inductance artificial transmission lines”, S. Chaudhuri, D. Li, K. D. Irwin, C. Bockstiegel, J. Hubmayr, J. N. Ullom, M. R. Vissers, and J. Gao, Appl. Phys. Lett. 110, 152601 (2017); https://doi.org/10.1063/1.4980102
5. “A tunable coupler for superconducting microwave resonators using a nonlinear kinetic inductance transmission line”, C. Bockstiegel, Y. Wang, M. R. Vissers, L. F. Wei, S. Chaudhuri, J. Hubmayr, and J. Gao, Appl. Phys. Lett. 108, 222604 (2016); https://doi.org/10.1063/1.4953209
6. “A thin-film cryotron suitable for use as an ultra-low-temperature switch”, P. J. Lowell, J. A. B. Mates, W. B. Doriese, G. C. Hilton, K. M. Morgan, D. S. Swetz, J. N. Ullom, and D. R. Schmidt, Appl. Phys. Lett. 109, 142601 (2016); https://doi.org/10.1063/1.4964345
7.  “Frequency-tunable superconducting resonators via nonlinear kinetic inductance”, M. R. Vissers, J. Hubmayr, M. Sandberg, S. Chaudhuri, C. Bockstiegel, and J. Gao, Appl. Phys. Lett. 107, 062601 (2015); https://doi.org/10.1063/1.4927444
8. “Photon-noise limited sensitivity in titanium nitride kinetic inductance detectors”, J Hubmayr, J Beall, D Becker, et al, Appl. Phys. Lett. 106, 073505 (2015); https://doi.org/10.1063/1.4913418