mm.physics.fock.U_to_choi

mrmustard.physics.fock.U_to_choi(U, Udual=None)

Converts a unitary transformation to a Choi tensor.

Parameters:

• U (ndarray[Tuple[int, ...], Union[TypeVar(R, float16, float32, float64), TypeVar(C, complex64, complex128), TypeVar(Z, int16, int32, int64), TypeVar(N, uint16, uint32, uint64)]]) – the unitary transformation

• Udual (Optional[ndarray[Tuple[int, ...], Union[TypeVar(R, float16, float32, float64), TypeVar(C, complex64, complex128), TypeVar(Z, int16, int32, int64), TypeVar(N, uint16, uint32, uint64)]]]) – the dual unitary transformation (optional, will use conj U if not provided)

Returns:

the Choi tensor. The index order is going to be \([\mathrm{out}_l, \mathrm{in}_l, \mathrm{out}_r, \mathrm{in}_r]\) where \(\mathrm{in}_l\) and \(\mathrm{in}_r\) are to be contracted with the left and right indices of the density matrix.

Return type:

Tensor

code/api/mrmustard.physics.fock.U_to_choi

 

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