mm.physics.fock.dm_to_ket

mrmustard.physics.fock.dm_to_ket(dm)

Maps a density matrix to a ket if the state is pure.

If the state is pure \(\hat \rho= |\psi\rangle\langle \psi|\) then the ket is the eigenvector of \(\rho\) corresponding to the eigenvalue 1.

Parameters:

dm (Tensor) – the density matrix

Returns:

the ket

Return type:

Tensor

Raises:

ValueError – if ket for mixed states cannot be calculated

code/api/mrmustard.physics.fock.dm_to_ket

 

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