sf.physics.gaussian.von_neumann_entropy

mrmustard.physics.gaussian.von_neumann_entropy(cov)[source]

Returns the Von Neumann entropy.

For a pure state, we expect the Von Neumann entropy to be 0.

Reference: (https://arxiv.org/pdf/1110.3234.pdf), Equations 46-47.

Parameters:

cov (Matrix) – the covariance matrix

Returns:

the Von Neumann entropy

Return type:

float