Is your feature request related to a problem? Please describe.
Currently, if a problem doesn't have a drift Hamiltonian a matrix of zeros must be passed in its place.
Describe the solution you'd like
It would be nice to have a constructor method that omits the drift term.
Is your feature request related to a problem? Please describe. Currently, if a problem doesn't have a drift Hamiltonian a matrix of zeros must be passed in its place.
Describe the solution you'd like It would be nice to have a constructor method that omits the drift term.