quantum-circuits

Is your feature request related to a use case or problem? Please describe.
Right now a lot of modules (in particular tests) are pretty free form with how they do imports. It's a good practice to import modules wherever possible.

bad:

from cirq.devices import GridQubit

good:

from cirq import devices

devices.GridQubit(whatever)

**Describe the soluti

Currently DDSIM uses OpenMP to parallelize the hybrid Schrodinger-Feynman simulation approach. There are two places where OpenMP is used:

• In https://github.com/iic-jku/ddsim/blob/36661b7ec71a6c6f0cbf7abfb67fbba3f192926c/src/HybridSchrodingerFeynmanSimulator.cpp#L134 where a stack of tasks is concurrently accessed by a set number of threads in a parallel region.
• In https://github.com/iic-

Modify show so that too large tableaux do not pollute the CLI

At the moment, QMAP provides a default set of hard-coded architectures to map to. While we allow to specify own architectures (and, in theory, calibration data) in the form of individual input files this is rather inflexible and can be improved.

It should be possible to take an arbitrary Qiskit backend in Python, e.g., anything from https://github.com/Qiskit/qiskit-terra/tree/main/qiskit/test/m