Struct Matchgate 

pub struct Matchgate { /* private fields */ }

Defines a matchgate operator.

A two-qubit operator that applies a matchgate transformation to the adjacent target qubits. This gate can be decomposed into a two-qubit rotation and phase shifts. It is designed to simulate nearest-neighbor interactions in fermionic systems.

It resembles the matrix operator:

[1 0 0 0; 0 cos(theta/2) -e^(i*phi1)sin(theta/2) 0; 0 sin(theta/2) e^(i*phi2)cos(theta/2) 0; 0 0 0 e^(i*phi2)]

Warning

This gate is not yet compilable to OpenQASM, since it requires advanced decomposition techniques.

Implementations

impl Matchgate

pub fn new(theta: f64, phi1: f64, phi2: f64) -> Self

Creates a new Matchgate operator with the specified parameters.

Arguments:

• theta - The angle of rotation in radians.
• phi1 - The first phase shift in radians.
• phi2 - The second phase shift in radians.

Trait Implementations

impl Clone for Matchgate

fn clone(&self) -> Matchgate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Matchgate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Matchgate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Operator for Matchgate

fn apply( &self, state: &State, target_qubit: &[usize], control_qubits: &[usize], ) -> Result<State, Error>

Applies the matchgate operator to the given state’s target qubit and its adjacent qubit.

Arguments:

• state - The state to apply the operator to.

• target_qubit - The target qubit to apply the operator to. The adjacent is automatically determined as the next qubit.

• control_qubits - The control qubits for the operator. If not empty, the operator will be applied conditionally based on the control qubits. Otherwise, it will be applied unconditionally.

Returns:

• The new state after applying the matchgate operator.

Errors:

• Error::InvalidNumberOfQubits - If the number of target qubits is not 1.

• Error::InvalidQubitIndex - If the target qubit indices are invalid for the number of qubits in the state, or if the target qubit is the last qubit.

• Error::OverlappingControlAndTargetQubits - If the control qubit and target qubit indices overlap.

fn base_qubits(&self) -> usize

Returns the number of qubits that the operator acts on.

fn to_compilable(&self) -> Option<&dyn Compilable>

Optionally returns an intermediate representation of the operator for compilation to OpenQASM.

impl Copy for Matchgate