density matrix
6.At a definite temperature a mesoscopic circuit isnt in a determinate quantum state instead of in the mixed state (or statistical state).Using the density matrix of the canonical ensemble,we have deduced the formulate of the quantum fluctuations of both charge and current in a non-dissipative mesoscopic coupled circuit.And the dependences of the quantum fluctuation of the circuit on its temperature have obtained.
7.4. Present the Chase-MP iterative decoding algorithm for GLD codes, and provide the performance analysis of the iterative algorithm by using the Gaussian approximation on the BI-AWGN channel: We give a fast hybrid method for the realization of Chase-II decoding, by which the low-complexity Chase-MP algorithm is designed based on the Tanner graph of the low-density matrix. By using

