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use crate::{column_vector, complex, ColumnVector, Complex, Matrix, Vector, VectorMatrix};
use core::{fmt, ops};
// TODO(Hachem): Redo these macros to work with the new function definition.
#[macro_export]
macro_rules! count {
() => { 0 };
($head:expr $(,$tail:expr)*) => { 1 + count!($( $tail ),*) };
}
#[macro_export]
macro_rules! qubit {
($(($re:expr, $im:expr)),*) => {
{
let mut vector = Vec::new();
$(
vector.push(complex!($re, $im));
)*
QuantumBit::new(vector)
}
};
}
#[macro_export]
macro_rules! quantum_register {
($($bit:expr),*) => {
{
const N: usize = count!($($bit),*);
let mut bits: [QuantumBit; N] = [$($bit),*];
QuantumRegister::from(&mut bits)
}
};
}
pub type QuantumState = ColumnVector<Complex<f64>>;
impl QuantumState {
pub fn state_0() -> QuantumState {
column_vector![complex!(1.0, 0.0), complex!(0.0, 0.0)]
}
pub fn state_1() -> QuantumState {
column_vector![complex!(0.0, 0.0), complex!(1.0, 0.0)]
}
}
#[derive(Clone)]
pub struct QuantumBit<'a> {
state: QuantumState,
name: &'a str,
}
#[derive(Clone)]
pub struct QuantumRegister<'a> {
state_vector: QuantumState,
name: &'a str,
qubits: Vec<QuantumBit<'a>>,
}
#[derive(Clone)]
pub struct QuantumGate<'a> {
pub name: &'a str,
pub matrix: Matrix<Complex<f64>>,
}
impl<'a> QuantumBit<'a> {
pub fn new(name: &'a str, state: QuantumState) -> QuantumBit<'a> {
QuantumBit { name, state }
}
pub fn get_state(&self) -> QuantumState {
self.state.clone()
}
pub fn get_name(&self) -> &'a str {
self.name
}
}
impl<'a> QuantumRegister<'a> {
pub fn new(name: &'a str, names: &[&'a str]) -> QuantumRegister<'a> {
let mut bits: Vec<QuantumBit<'a>> = Vec::new();
for i in 0..names.len() {
bits.push(QuantumBit::new(names[i], QuantumState::state_0()))
}
QuantumRegister::from(name, &mut bits)
}
pub fn from(name: &'a str, bits: &mut [QuantumBit<'a>]) -> QuantumRegister<'a> {
let mut register = QuantumRegister {
name,
qubits: bits.to_vec(),
state_vector: ColumnVector::new(vec![]),
};
register.update();
register
}
fn update(&mut self) {
let matrices: Vec<Matrix<Complex<f64>>> = self
.qubits
.iter()
.map(|qubit| qubit.state.to_matrix())
.collect();
let mut new_result = matrices[0].clone();
for matrix in &matrices[1..] {
new_result = new_result.kronecker(matrix);
}
self.state_vector = ColumnVector::from_matrix(&new_result);
}
pub fn get_bits(&self) -> Vec<QuantumBit> {
self.qubits.clone()
}
pub fn get_state(&self) -> QuantumState {
self.state_vector.clone()
}
pub fn get_name(&self) -> &'a str {
self.name
}
}
impl<'a> ops::Index<usize> for QuantumRegister<'a> {
type Output = QuantumBit<'a>;
fn index(&self, index: usize) -> &Self::Output {
&self.qubits[index]
}
}
impl<'a> ops::IndexMut<usize> for QuantumRegister<'a> {
fn index_mut(&mut self, index: usize) -> &mut Self::Output {
&mut self.qubits[index]
}
}
impl<'a> fmt::Display for QuantumGate<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.name)
}
}
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