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

(18) |

where 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

(19) |

where denotes the von Neumann entropy.

2004-11-07