Fix warnings

Author: long-long-float

examples/qcl.rs

@@ -1,22 +1,15 @@
 //! This example implements a Quantum Circuit Learning (QCL)
 //! This is a port of https://dojo.qulacs.org/ja/latest/notebooks/5.2_Quantum_Circuit_Learning.html
 
-use core::{f64, time};
-use std::{
-    collections::{HashMap, VecDeque},
-    f64::consts::PI,
-};
+use core::f64;
+use std::f64::consts::PI;
 
 use anyhow::Result;
-use nalgebra::{Complex, DMatrix, DVector, Matrix1, Matrix2, Matrix4, MatrixN, SMatrix, Vector6};
-use nalgebra_sparse::convert::serial::convert_csr_dense;
-use nalgebra_sparse::CsrMatrix;
+use nalgebra::{Complex, DMatrix};
 use plotters::prelude::*;
-use rand::{distr, Rng};
-use rand_distr::num_traits::FromPrimitive;
+use rand::Rng;
 use simple_qsim::{
-    circuit::kronecker_product,
-    gates::{rx_matrix, ry_matrix, rz_matrix, x_matrix, z_matrix},
+    gates::{rx_matrix, ry_matrix, rz_matrix},
     Circuit, QState, Qbit,
 };
 
@@ -106,7 +99,7 @@ fn main() -> Result<()> {
     let mut u_out = Circuit::new(nqubit);
 
     let mut rng = rand::rng();
-    for d in 0..c_depth {
+    for _ in 0..c_depth {
         u_out.add_dence_gate(time_evol_op.clone());
         for i in 0..nqubit {
             // TODO: Support parameterized gates

src/observable.rs

@@ -6,10 +6,7 @@ use crate::{
     qstate::QState,
 };
 use anyhow::Result;
-use nalgebra_sparse::{
-    convert::serial::{convert_csr_dense, convert_dense_csr},
-    CsrMatrix,
-};
+use nalgebra_sparse::{convert::serial::convert_dense_csr, CsrMatrix};
 
 pub struct Observable {
     operators: Vec<PauliOperator>,
@@ -37,34 +34,6 @@ impl Observable {
         let mut expectation = 0.0;
 
         for operator in &self.operators {
-            let mut term = 0.0;
-            // for pauli_matrix in &operator.ops {
-            //     let index = pauli_matrix.index;
-            //     let kind = &pauli_matrix.kind;
-
-            //     let alpha = qstate
-            //         .state
-            //         .get(index)
-            //         .ok_or_else(|| anyhow::anyhow!("Index out of bounds for qstate"))?;
-            //     let beta = qstate
-            //         .state
-            //         .get(index + 1)
-            //         .ok_or_else(|| anyhow::anyhow!("Index out of bounds for qstate"))?;
-
-            //     match kind {
-            //         Pauli::I => {
-            //             // Identity does not change the expectation value
-            //         }
-            //         Pauli::X => term += 2.0 * (alpha.conj() * beta).re,
-            //         Pauli::Y => term += 2.0 * (alpha.conj() * beta).im,
-            //         Pauli::Z => {
-            //             let alpha = alpha.norm_sqr();
-            //             let beta = beta.norm_sqr();
-            //             term += alpha - beta;
-            //         }
-            //     }
-            // }
-
             let mut kinds = iter::repeat(Pauli::I)
                 .take(qstate.num_of_qbits())
                 .collect::<Vec<_>>();