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use super::{QuantumGate, QuantumRegister, QuantumState};
use crate::Vector;
use core::fmt;
#[derive(Clone)]
pub struct CircuitOperation<'a> {
pub gate: &'a QuantumGate<'a>,
pub targets: Vec<usize>,
}
impl<'a> CircuitOperation<'a> {
pub fn new(gate: &'a QuantumGate<'a>, targets: Vec<usize>) -> Self {
CircuitOperation { gate, targets }
}
}
pub struct QuantumCircuit<'a> {
register: QuantumRegister<'a>,
operations: Vec<CircuitOperation<'a>>,
}
impl<'a> QuantumCircuit<'a> {
pub fn new(num_qubits: usize) -> QuantumCircuit<'a> {
let names: Vec<String> = (0..num_qubits).map(|i| format!("q{}", i)).collect();
let leaked_names: &'a [String] = Box::leak(names.into_boxed_slice());
let name_refs: Vec<&'a str> = leaked_names.iter().map(|s| s.as_str()).collect();
QuantumCircuit {
register: QuantumRegister::new(
Box::leak(Box::new("circuit".to_string())).as_str(),
&name_refs,
),
operations: Vec::new(),
}
}
pub fn from_register(register: QuantumRegister<'a>) -> QuantumCircuit<'a> {
QuantumCircuit {
register,
operations: Vec::new(),
}
}
pub fn num_qubits(&self) -> usize {
self.register.num_qubits()
}
pub fn state(&self) -> QuantumState {
self.register.get_state()
}
pub fn register(&self) -> &QuantumRegister<'a> {
&self.register
}
pub fn operations(&self) -> &[CircuitOperation<'a>] {
&self.operations
}
pub fn apply(&mut self, gate: &'a QuantumGate<'a>, targets: &[usize]) -> &mut Self {
self.register.apply_gate(gate, targets);
self.operations
.push(CircuitOperation::new(gate, targets.to_vec()));
self
}
pub fn h(&mut self, target: usize) -> &mut Self {
use crate::gates::HADAMARD;
self.register.apply_gate(&HADAMARD, &[target]);
self.operations
.push(CircuitOperation::new(&HADAMARD, vec![target]));
self
}
pub fn x(&mut self, target: usize) -> &mut Self {
use crate::gates::PAULI_X;
self.register.apply_gate(&PAULI_X, &[target]);
self.operations
.push(CircuitOperation::new(&PAULI_X, vec![target]));
self
}
pub fn y(&mut self, target: usize) -> &mut Self {
use crate::gates::PAULI_Y;
self.register.apply_gate(&PAULI_Y, &[target]);
self.operations
.push(CircuitOperation::new(&PAULI_Y, vec![target]));
self
}
pub fn z(&mut self, target: usize) -> &mut Self {
use crate::gates::PAULI_Z;
self.register.apply_gate(&PAULI_Z, &[target]);
self.operations
.push(CircuitOperation::new(&PAULI_Z, vec![target]));
self
}
pub fn s(&mut self, target: usize) -> &mut Self {
use crate::gates::S_GATE;
self.register.apply_gate(&S_GATE, &[target]);
self.operations
.push(CircuitOperation::new(&S_GATE, vec![target]));
self
}
pub fn t(&mut self, target: usize) -> &mut Self {
use crate::gates::T_GATE;
self.register.apply_gate(&T_GATE, &[target]);
self.operations
.push(CircuitOperation::new(&T_GATE, vec![target]));
self
}
pub fn cnot(&mut self, control: usize, target: usize) -> &mut Self {
use crate::gates::CNOT;
self.register.apply_gate(&CNOT, &[control, target]);
self.operations
.push(CircuitOperation::new(&CNOT, vec![control, target]));
self
}
pub fn cx(&mut self, control: usize, target: usize) -> &mut Self {
self.cnot(control, target)
}
pub fn cz(&mut self, control: usize, target: usize) -> &mut Self {
use crate::gates::CZ;
self.register.apply_gate(&CZ, &[control, target]);
self.operations
.push(CircuitOperation::new(&CZ, vec![control, target]));
self
}
pub fn swap(&mut self, qubit1: usize, qubit2: usize) -> &mut Self {
use crate::gates::SWAP;
self.register.apply_gate(&SWAP, &[qubit1, qubit2]);
self.operations
.push(CircuitOperation::new(&SWAP, vec![qubit1, qubit2]));
self
}
pub fn ccnot(&mut self, control1: usize, control2: usize, target: usize) -> &mut Self {
use crate::gates::TOFFOLI;
self.register
.apply_gate(&TOFFOLI, &[control1, control2, target]);
self.operations.push(CircuitOperation::new(
&TOFFOLI,
vec![control1, control2, target],
));
self
}
pub fn toffoli(&mut self, control1: usize, control2: usize, target: usize) -> &mut Self {
self.ccnot(control1, control2, target)
}
pub fn cswap(&mut self, control: usize, target1: usize, target2: usize) -> &mut Self {
use crate::gates::FREDKIN;
self.register
.apply_gate(&FREDKIN, &[control, target1, target2]);
self.operations.push(CircuitOperation::new(
&FREDKIN,
vec![control, target1, target2],
));
self
}
pub fn fredkin(&mut self, control: usize, target1: usize, target2: usize) -> &mut Self {
self.cswap(control, target1, target2)
}
pub fn reset(&mut self) -> &mut Self {
let n = self.num_qubits();
let names: Vec<String> = (0..n).map(|i| format!("q{}", i)).collect();
let leaked_names: &'a [String] = Box::leak(names.into_boxed_slice());
let name_refs: Vec<&'a str> = leaked_names.iter().map(|s| s.as_str()).collect();
self.register = QuantumRegister::new(
Box::leak(Box::new("circuit".to_string())).as_str(),
&name_refs,
);
self.operations.clear();
self
}
pub fn probability(&self, state_index: usize) -> f64 {
let state = self.state();
let amp = state.get(state_index);
amp.norm2()
}
pub fn probabilities(&self) -> Vec<f64> {
let state = self.state();
let n = 1 << self.num_qubits();
(0..n).map(|i| state.get(i).norm2()).collect()
}
}
impl<'a> fmt::Display for QuantumCircuit<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
writeln!(f, "QuantumCircuit ({} qubits)", self.num_qubits())?;
writeln!(f, "Operations:")?;
for (i, op) in self.operations.iter().enumerate() {
writeln!(f, " {}: {} on {:?}", i, op.gate.name, op.targets)?;
}
writeln!(f, "State:")?;
let state = self.state();
let n = 1 << self.num_qubits();
for i in 0..n {
let amp = state.get(i);
if amp.real.abs() > 1e-10 || amp.imaginary.abs() > 1e-10 {
let basis: String = format!("{:0width$b}", i, width = self.num_qubits());
writeln!(f, " |{}⟩: {:.4}", basis, amp)?;
}
}
Ok(())
}
}
|
