# Metrics

A number of functions that can be used to quantify the properties of states such as entanglement are implemented. They are very straight-forward in terms of usage. For more information, see the list of functions below.

## [Functions](@id metrics: Functions)

* [`tracenorm`](@ref)
* [`tracenorm_h`](@ref)
* [`tracenorm_nh`](@ref)
* [`tracedistance`](@ref)
* [`tracedistance_h`](@ref)
* [`tracedistance_nh`](@ref)
* [`entropy_vn`](@ref)
* [`fidelity`](@ref)
* [`ptranspose`](@ref)
* [`PPT`](@ref)
* [`negativity`](@ref)
* [`logarithmic_negativity`](@ref)

## [Examples](@id metrics: Examples)

* [Entanglement of Two Qubits](@ref)
