Solution
= Solution
\b[No.] In <quantum dense coding>, Alice's four encodings produce four different joint Bell states, but the qubit she transmits has reduced state
$$
\rho_A=\frac I2
$$
in every case. Charlie intercepts only that qubit, so every measurement he can perform has the same probability distribution for messages $00,01,10,11$. He gains no information about the two-bit string.