TBE (bit labels);
shows the sum of the binary entropies of individual qubits specified by
bit labels. A binary entropy of the -th qubit is
is the intrinsic polarization of the -th qubit,
which is calculated according to the eigenvalues, and
, of the reduced density operator
of the qubit.
In other words, the command shows the total binary entropy
where denotes the von Neumann entropy.