Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics and Cryogenics: Poster Session

TT 31.1: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

Modular architecture for circuit quantum electrodynamics — •Soeren Ihssen¹, Simon Geisert¹, Martin Spiecker², Patrick Paluch², Elie de Seze^1,3, Wolfgang Wernsdorfer^1,2, Patrick Winkel⁴, and Ioan Pop^1,2 — ¹Institute for Quantum Materials and Technologies, KIT, Germany — ²Physikalisches Institut, KIT, Germany — ³ENS Paris-Saclay, France — ⁴Yale University, USA

Superconducting quantum circuits play a pioneering role in finding a scalable architecture for the realization of a coherent quantum processor. In this context, keeping the integrity, individual addressability and controllability of each circuit component while increasing the complexity of the whole system is paramount to building a functional device. Fulfilling these key requirements becomes more difficult when increasing the connectivity in the circuit since parasitic cross-talk and the number of decay channels increase at the same time. Therefore, the coupling, readout and control mechanisms of every architecture need to be understood in great detail. Here, we investigate a flip-chip architecture in which we implement the readout and flux control of generalized flux qubits. With our approach, circuits serving different tasks within the system can be prepared individually and exchanged in case they do not fulfil the requirements. In our first realization, a bandpass Purcell filter for readout and an on-chip flux bias line are fabricated and tested regarding their microwave properties. The developed circuit enables a suitable easy-access framework for future experiments on qubit-qubit coupling in a well-controlled microwave environment.