quspin.basis.coherent_state

quspin.basis.coherent_state(a, n, dtype=<class 'numpy.float64'>)[source]

Creates a harmonic oscillator (HO) coherent state.

Parameters:

a: float

Expectation value of annihilation operator \(\langle a\rangle\) or, equivalently square root of the mean particle number.

n: int

Cut-off on the number of HO eigenstates kept in the definition of the coherent state.

dtype: ‘type’

Data type (e.g. numpy.float64) to construct the coherent state with. Default is np.float64.

Returns:

numpy.ndarray

Harmonic oscilaltor coherent state.

Examples

>>> coherent_state(a,n,dtype=np.float64)