I'd like to understand the physical difference between the states created using the following two means, i.e. state1 and state2:

    from qutip import *
    modes  = 4
    vaccum = fock(modes)
    c_op   =  create(modes)

    state1 = fock(modes, 2)
    state2 = c_op*c_op*vaccum

The output obtained shows:

> state1 
> [[0]


> state2
> [[0]

The first one is described as a fock state with two particles, and the second one as a fock state two excitations. While I understand the latter, the former is not clear to me - help would be really appreciated!



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