From 483e9e6ce9fbb1440992e916ec743ce0eff0ab5a Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sat, 12 Oct 2024 16:56:12 +0200
Subject: Simplify and start rework of gate application

---
 libpsi-core/src/core/circuit.rs   | 16 ++++++++--------
 libpsi-core/src/core/component.rs | 16 +++++++---------
 libpsi-core/src/core/runtime.rs   | 16 ++++++++--------
 3 files changed, 23 insertions(+), 25 deletions(-)

(limited to 'libpsi-core/src/core')

diff --git a/libpsi-core/src/core/circuit.rs b/libpsi-core/src/core/circuit.rs
index 183c4a2..635066a 100644
--- a/libpsi-core/src/core/circuit.rs
+++ b/libpsi-core/src/core/circuit.rs
@@ -1,14 +1,14 @@
-use super::{ClassicalRegister, QuantumBit, QuantumGate};
+use super::{ClassicalRegister, QuantumGate, QuantumRegister};
 
 #[derive(Clone)]
 pub struct QuantumCircuitInstruction {
-    pub target_indices: Vec<usize>,
+    pub target_bit: usize,
     pub control_indices: Vec<usize>,
     pub gate: QuantumGate,
 }
 
 pub struct QuantumCircuit {
-    quantum_bits: Vec<QuantumBit>,
+    quantum_register: QuantumRegister,
     classical_register: ClassicalRegister,
     instructions: Vec<QuantumCircuitInstruction>,
 }
@@ -16,22 +16,22 @@ pub struct QuantumCircuit {
 impl QuantumCircuit {
     pub fn new(quantum_bit_count: usize, classical_bit_count: usize) -> QuantumCircuit {
         QuantumCircuit {
-            quantum_bits: vec![QuantumBit::state_0(); quantum_bit_count],
+            quantum_register: QuantumRegister::new(quantum_bit_count),
             classical_register: ClassicalRegister::new(classical_bit_count),
             instructions: Vec::new(),
         }
     }
 
-    pub fn apply(&mut self, gate: &QuantumGate, control_bits: &[usize], target_bits: &[usize]) {
+    pub fn apply(&mut self, gate: &QuantumGate, control_bits: &[usize], target_bit: usize) {
         self.instructions.push(QuantumCircuitInstruction {
             gate: gate.clone(),
-            target_indices: target_bits.to_vec(),
+            target_bit,
             control_indices: control_bits.to_vec(),
         });
     }
 
-    pub fn get_quantum_bits(&self) -> Vec<QuantumBit> {
-        self.quantum_bits.clone()
+    pub fn get_quantum_register(&self) -> QuantumRegister {
+        self.quantum_register.clone()
     }
 
     pub fn get_classical_registers(&self) -> ClassicalRegister {
diff --git a/libpsi-core/src/core/component.rs b/libpsi-core/src/core/component.rs
index be5fbca..d2dc781 100644
--- a/libpsi-core/src/core/component.rs
+++ b/libpsi-core/src/core/component.rs
@@ -4,7 +4,8 @@ use crate::{complex, ColumnVector, Complex, Matrix, Vector, VectorMatrix};
 use core::ops;
 
 pub type QuantumBit = ColumnVector<Complex<f64>>;
-pub type QuantumGate = (&'static str, Matrix<Complex<f64>>);
+pub type QuantumState = Matrix<Complex<f64>>;
+pub type QuantumGate = (&'static str, QuantumState);
 
 #[macro_export]
 macro_rules! count {
@@ -41,6 +42,7 @@ pub struct ClassicalRegister {
     bits: Vec<i32>,
 }
 
+#[derive(Clone)]
 pub struct QuantumRegister {
     state: ColumnVector<Complex<f64>>,
     qubits: Vec<QuantumBit>,
@@ -101,6 +103,10 @@ impl QuantumRegister {
         self.state = ColumnVector::from_matrix(&new_result);
     }
 
+    pub fn new(count: usize) -> QuantumRegister {
+        QuantumRegister::from(&mut vec![QuantumBit::state_0(); count])
+    }
+
     pub fn from(bits: &mut [QuantumBit]) -> QuantumRegister {
         let mut register = QuantumRegister {
             qubits: bits.to_vec(),
@@ -111,10 +117,6 @@ impl QuantumRegister {
         register
     }
 
-    pub fn measure(&self, classical_register: &mut ClassicalRegister) {
-        classical_register.set_bits(self.qubits.iter().map(|qubit| qubit.measure()).collect());
-    }
-
     pub fn get_bits(&self) -> Vec<QuantumBit> {
         self.qubits.clone()
     }
@@ -122,10 +124,6 @@ impl QuantumRegister {
     pub fn get_state(&self) -> ColumnVector<Complex<f64>> {
         self.state.clone()
     }
-
-    pub fn apply(&self, gate: &QuantumGate) -> QuantumBit {
-        self.state.mul_matrix(&gate.1).unwrap()
-    }
 }
 
 impl ops::Index<usize> for QuantumRegister {
diff --git a/libpsi-core/src/core/runtime.rs b/libpsi-core/src/core/runtime.rs
index 0937f3c..19ac191 100644
--- a/libpsi-core/src/core/runtime.rs
+++ b/libpsi-core/src/core/runtime.rs
@@ -1,15 +1,15 @@
-use super::{ClassicalRegister, QuantumBit, QuantumCircuit};
+use super::{ClassicalRegister, QuantumCircuit, QuantumRegister};
 
 #[allow(unused)]
-pub struct ExecutationData {
-    pub quantum_states: Vec<QuantumBit>,
+pub struct ExecutionData {
+    pub quantum_register: QuantumRegister,
     pub classical_states: ClassicalRegister,
 }
 
-impl ExecutationData {
-    pub fn new(quantum_states: Vec<QuantumBit>, classical_states: ClassicalRegister) -> Self {
-        ExecutationData {
-            quantum_states,
+impl ExecutionData {
+    pub fn new(quantum_register: QuantumRegister, classical_states: ClassicalRegister) -> Self {
+        ExecutionData {
+            quantum_register,
             classical_states,
         }
     }
@@ -21,5 +21,5 @@ pub trait RuntimeBase {
 
 pub trait Runtime<'a, T: RuntimeBase = Self> {
     fn new(circuit: &'a QuantumCircuit) -> Self;
-    fn execute(&self, repeat: usize) -> Vec<ExecutationData>;
+    fn execute(&self, repeat: usize) -> Vec<ExecutionData>;
 }
-- 
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