Modular Architecture for Circuit Quantum Electrodynamics

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
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suitable easy-access framework for future experiments on qubit-qubit
coupling in a well-controlled microwave environment