Optimize1qGates

class qiskit.transpiler.passes.Optimize1qGates(*args, **kwargs)

Bases: TransformationPass

Optimize chains of single-qubit u1, u2, u3 gates by combining them into a single gate.

Optimize1qGates initializer.

Parameter:

• basis (list[str]) – Basis gates to consider, e.g. [‚u3‘, ‚cx‘]. For the effects of this pass, the basis is the set intersection between the basis parameter and the set {‚u1‘,‘u2‘,‘u3‘, ‚u‘, ‚p‘}.

• eps (float) – EPS to check against

• target (Target) – The Target representing the target backend, if both basis and this are specified then this argument will take precedence and basis will be ignored.

Attributes

is_analysis_pass

Check if the pass is an analysis pass.

If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.

is_transformation_pass

Check if the pass is a transformation pass.

If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).

Methods

static compose_u3(theta1, phi1, lambda1, theta2, phi2, lambda2)

Return a triple theta, phi, lambda for the product.

u3(theta, phi, lambda)

= u3(theta1, phi1, lambda1).u3(theta2, phi2, lambda2) = Rz(phi1).Ry(theta1).Rz(lambda1+phi2).Ry(theta2).Rz(lambda2) = Rz(phi1).Rz(phi‘).Ry(theta‘).Rz(lambda‘).Rz(lambda2) = u3(theta‘, phi1 + phi‘, lambda2 + lambda‘)

Return theta, phi, lambda.

name()

Return the name of the pass.

run(dag)

Run the Optimize1qGates pass on dag.

Parameter:

dag (DAGCircuit) – the DAG to be optimized.

Rückgabe:

the optimized DAG.

Rückgabetyp:

DAGCircuit

Verursacht:

TranspilerError – if YZY and ZYZ angles do not give same rotation matrix.

static yzy_to_zyz(xi, theta1, theta2, eps=1e-09)

Express a Y.Z.Y single qubit gate as a Z.Y.Z gate.

Solve the equation

\[\]

Ry(theta1).Rz(xi).Ry(theta2) = Rz(phi).Ry(theta).Rz(lambda)

for theta, phi, and lambda.

Return a solution theta, phi, and lambda.