Optimize1qGates

qiskit.transpiler.passes.Optimize1qGates(*args, **kwargs)GitHub(opens in a new tab)

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

Optimize1qGates initializer.

Parameters

• basis (list(opens in a new tab)[str(opens in a new tab)]) – 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(opens in a new tab)) – EPS to check against
• target (Target) – The Target representing the target backend, if both basis and target 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

compose_u3

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.

execute

execute(passmanager_ir, state, callback=None)

Execute optimization task for input Qiskit IR.

Parameters

Returns

Optimized Qiskit IR and state of the workflow.

Return type

name

name()

Name of the pass.

Return type

str(opens in a new tab)

run

run(dag)

Run the Optimize1qGates pass on dag.

Parameters

dag (DAGCircuit) – the DAG to be optimized.

Returns

the optimized DAG.

Return type

DAGCircuit

Raises

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

update_status

update_status(state, run_state)

Update workflow status.

Parameters

• state (PassManagerState) – Pass manager state to update.
• run_state (RunState) – Completion status of current task.

Returns

Updated pass manager state.

Return type

PassManagerState

yzy_to_zyz

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.