mm.physics.fock.apply_kraus_to_dm

mrmustard.physics.fock.apply_kraus_to_dm(kraus, dm, kraus_in_modes, kraus_out_modes=None)

Applies a kraus operator to a density matrix. It assumes that the density matrix is indexed as left_1, …, left_n, right_1, …, right_n.

The kraus operator has indices that contract with the density matrix (kraus_in_modes) and indices that are leftover (kraus_out_modes). kraus will contract from the left and from the right with the density matrix. For right contraction the kraus op is conjugated.

Parameters:

• kraus (array) – the operator to be applied

• dm (array) – the density matrix to which the operator is applied

• kraus_in_modes (list of ints) – the indices (counting from 0) of the kraus operator that contract with the density matrix

• kraus_out_modes (list of ints) – the indices (counting from 0) of the kraus operator that are leftover (default None, in which case kraus_out_modes = kraus_in_modes)

Returns:

the resulting density matrix

Return type:

array

code/api/mrmustard.physics.fock.apply_kraus_to_dm

 

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