Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Superconducting Electronics: SQUIDs, Qubits, Circuit QED II

TT 50.11: Talk

Thursday, March 20, 2025, 17:45–18:00, H36

Nonlinear High-Kinetic-Inductance Microstrips for Integrated Non-Reciprocal Devices — •Niklas Gaiser¹, Ciprian Padurariu¹, Björn Kubala^1,2, Nadav Katz³, and Joachim Ankerhold¹ — ¹ICQ and IQST, University of Ulm, Ulm, Germany — ²Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany — ³The Racah Institute of Physics, The Hebrew University of Jerusalem, Israel

Superconducting microwave circuits offer a rich platform for many quantum information devices and quantum-technological applications. Recently, nonlinear properties of circuit elements have become of increasing interest as they allow new functionalities, such as frequency mixing or self-interaction of waves. Microstrip waveguides with high-kinetic-inductance, as experimentally realized in [1], possess strong nonlinear features. Moreover, they yield a greatly reduced phase velocity which addresses the challenge of long wavelengths in the microwave regime and enable highly compact and integrated on-chip solutions.

Here, we present a theoretical proposal for a devices that utilizes a nonlinear high-kinetic-inductance to achieve a non-reciprocal effect. Diode-like behaviour is proven with markedly dissimilar transmission spectra for signals propagating through the device in different directions. We discuss the nonlinearities’ power dependence as well as the special boundary conditions posed by the nonlinear propagation problem.

[1] S. Goldstein, G. Pardo, N. Kirsh, N. Gaiser, C. Padurariu, B. Kubala, J. Ankerhold, N. Katz, New J. Phys. 24, 023022 (2022).

Keywords: superconducting microwave circuits; nonlinear high-kinetic-indutance; waveguide; diode; non-reciprocal