corrected DHS and 1st order dpt simulations

...Hilbert space - one system- matel method-checkpoint.ipynb

.../Dynamical Hilbert space - one system- matel method.ipynb

Structural codes/Dynamical Hilbert space/DHS.py

...es/Dynamical Hilbert space/__pycache__/DHS.cpython-39.pyc

...simulations/.ipynb_checkpoints/Untitled1-checkpoint.ipynb

Tests/PT simulations/Untitled1.ipynb

...ipynb_checkpoints/1st order PT advantage-checkpoint.ipynb

...or non-instantaneous switching off-Copy1-checkpoint.ipynb

...or non-instantaneous switching off-Copy2-checkpoint.ipynb

Tests/Readout setup/1st order PT advantage.ipynb

...nfidelity for non-instantaneous switching off-Copy1.ipynb

...nfidelity for non-instantaneous switching off-Copy2.ipynb