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system that needs to be changed in order to implement new experiments. Since
all that these Servers need to do is to provide a Setting that takes a single data
point with the parameters provided by the Registry, these Servers are usually
extremely simple and concise.
This allows for very high turn-around for new
experiments. This is further assisted by the fact that these Servers do not even
need to know what parameters in the Registry are being swept for a given data run.
This commonly allows the Settings to be used for a variety of different types of
experiments. As an example, consider a Setting that runs a sequence that consists
of only a single microwave pulse on each qubit followed by a delayed measurement.
Such a Setting can be used to measure Rabi oscillations as a function of pulse
power and pulse length, T 1 decays as a function of the delay of the measurement
pulse, multi-qubit swap operations, and even step-edges and s-curves by setting
the pulse amplitude to 0 (these experiments are explained in Chapter 8).
When running an experiment, the Sweep Client selects an experimental setup
with the Qubit Server that defines the list of qubits that are to be used in the
experiment as well as the hardware channels that are needed to control them. The
Qubit Server provides a Setting (“Experiment Involved Qubits”) that allows the
Experiment Servers to request the list of qubits that are part of the current setup.
This way, the Experiment Servers can automatically loop over all involved qubits
and run the desired sequence on all qubits with the different sequence parame-
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