SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Quantum Coherence and Quantum Information Systems II

TT 54.4: Vortrag

Donnerstag, 30. März 2023, 15:45–16:00, HSZ 304

High kinetic inductance microstrip networks for integrated quantum information 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

Modern superconducting quantum information devices integrate qubits and readout resonators into complex microwave circuits. Efficient qubit operation and fast readout require relatively strong coupling. This, however, can compromise the qubit lifetime due to spontaneous emission through the resonator. An elegant solution is provided by a Purcell filter, an added circuit element that suppresses transmission at the qubit frequency.

Here, we present a theoretical proposal for circuit architectures that realize qubit readout with Purcell filters, utilizing the highly versatile platform of high-kinetic inductance microstrip networks experimentally realized in [1]. The strongly reduced phase velocities in such materials allow compact filter designs that can be integrated on-chip. We describe band-structure design techniques to build an efficient Purcell filter and provide quantitative estimations for the suppression of unwanted relaxation channels.

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