Noisy channel

In this software, only the independent error model is handled. In the model, a error in a wire is independent of those in other wires. Here is a command:
IEOpE (bit labels, $ \underset{E_1}{(a~~b)(c~~d)}$, $ \underset{E_2}{(e~~f)(g~~h)}$, ...);
This command applies a single-wire noisy channel with operation elements $ E_1$, $ E_2$, ... to every qubits specified by bit labels. An operation element must be written in the form `` $ (a~~b)(c~~d)$'' such as `` $ (0~~0.1i)(-0.1i~~0)$''.