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use libpsi_core::*;
fn main() {
println!("Bell State Creation: |Φ+⟩ = (|00⟩ + |11⟩)/√2");
println!(" Circuit: H(q0) → CNOT(q0, q1)");
let mut bell = QuantumCircuit::new(2);
bell.h(0).cnot(0, 1);
println!("{}", bell);
print!("------\n\n");
println!("GHZ State (3-qubit entanglement): |GHZ> = (|000⟩ + |111⟩)/√2");
println!(" Circuit: H(q0) → CNOT(q0, q1) → CNOT(q0, q2)");
let mut ghz = QuantumCircuit::new(3);
ghz.h(0).cnot(0, 1).cnot(0, 2);
println!("{}", ghz);
print!("------\n\n");
println!("SWAP via 3 CNOTs");
println!(" Start with |10>, apply CNOT chain");
let mut swap_circuit = QuantumCircuit::new(2);
swap_circuit
.x(0) // Set to |10⟩
.cnot(0, 1)
.cnot(1, 0)
.cnot(0, 1);
println!("{}", swap_circuit);
print!("------\n\n");
println!("Toffoli Gate (Reversible AND)");
println!(" CCNOT flips q2 only when q0=1 AND q1=1");
let mut toffoli_circuit = QuantumCircuit::new(3);
toffoli_circuit
.x(0)
.x(1) // Set to |110⟩
.toffoli(0, 1, 2);
println!("{}", toffoli_circuit);
print!("------\n\n");
println!("Fredkin Gate (Controlled SWAP)");
println!(" CSWAP swaps q1 and q2 only when q0=1");
let mut fredkin_circuit = QuantumCircuit::new(3);
fredkin_circuit
.x(0)
.x(1) // Set to |110⟩
.fredkin(0, 1, 2);
println!("{}", fredkin_circuit);
print!("------\n\n");
println!("6. Non-contiguous CNOT (q0 controls q2, skipping q1)");
let mut nc_circuit = QuantumCircuit::new(3);
nc_circuit
.x(0) // |100⟩
.cnot(0, 2); // CNOT with control=q0, target=q2
println!("{}", nc_circuit);
print!("------\n\n");
println!("Full Superposition (H on all qubits)");
let mut super_circuit = QuantumCircuit::new(3);
super_circuit.h(0).h(1).h(2);
println!("{}", super_circuit);
print!("------\n\n");
println!("Probability Test");
let mut prob_circuit = QuantumCircuit::new(2);
prob_circuit.h(0).cnot(0, 1);
prob_circuit.print_probabilities();
println!();
print!("------\n\n");
println!("Complex Circuit with Method Chaining");
let mut complex = QuantumCircuit::new(4);
complex.h(0).h(1).cnot(0, 2).cnot(1, 3).cz(2, 3).swap(0, 1);
println!("{}", complex);
}
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