Fix #818. (#819)

Author: Chris Granade

src/Simulation/qdk_sim_rs/src/c_api.rs

@@ -101,7 +101,7 @@ pub extern "C" fn lasterr() -> *const c_char {
 /// - **`pure`**: Creates the simulator with an initial state represented by
 ///   a state vector.
 /// - **`mixed`**: Creates the simulator with an initial state represented by
-///   a density operat.
+///   a density operator.
 /// - **`stabilizer`**: Creates the simulator with an initial state represented by
 ///   a stabilizer tableau.
 ///

src/Simulation/qdk_sim_rs/src/processes/apply.rs

@@ -27,9 +27,9 @@ impl Process {
         }
 
         match &self.data {
-            Unitary(u) => apply_unitary(&u, state),
-            KrausDecomposition(ks) => apply_kraus_decomposition(&ks, state),
-            MixedPauli(paulis) => apply_pauli_channel(&paulis, state),
+            Unitary(u) => apply_unitary(u, state),
+            KrausDecomposition(ks) => apply_kraus_decomposition(ks, state),
+            MixedPauli(paulis) => apply_pauli_channel(paulis, state),
             Sequence(processes) => {
                 // TODO[perf]: eliminate the extraneous clone here.
                 let mut acc_state = state.clone();

src/Simulation/qdk_sim_rs/src/states.rs

@@ -162,7 +162,7 @@ impl Trace for &State {
     fn trace(self) -> Self::Output {
         match &self.data {
             Pure(_) | StateData::Stabilizer(_) => C64::one(),
-            Mixed(ref rho) => (&rho).trace(),
+            Mixed(ref rho) => rho.trace(),
         }
     }
 }