Simultaneous quantum jumps on multiple Fluxonium qubits

Superconducting quantum circuits have become one of the front runners for the implementation of scalable quantum processors. Hereby, the ability to design and implement multiple artificial atoms and their couplings has become the main task for many researchers. Therefore it is imperative to understand how events on one qubit influence other qubits on the same chip. Here, we take simultaneous quantum jump traces of multiple Fluxonium qubits on the same chip using a frequency multiplexed readout scheme through dispersive measurement.
The simultaneity is ensured by the frequency multiplexing, enabling both signals to use the same input and output lines. The resulting quantum jump traces are then analysed for simultaneous events in respect to the stochastically expected coherences for perfectly uncoupled quantum systems.