qiskit.transpiler.passes.Optimize1qGates
class Optimize1qGates(*args, **kwargs)
Optimize chains of single-qubit u1, u2, u3 gates by combining them into a single gate.
Optimize1qGates initializer.
Parameters
- 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
__init__
__init__(basis=None, eps=1e-15)
Optimize1qGates initializer.
Parameters
- 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
Methods
__init__([basis, eps]) | Optimize1qGates initializer. |
compose_u3(theta1, phi1, lambda1, theta2, …) | Return a triple theta, phi, lambda for the product. |
name() | Return the name of the pass. |
run(dag) | Run the Optimize1qGates pass on dag. |
yzy_to_zyz(xi, theta1, theta2[, eps]) | Express a Y.Z.Y single qubit gate as a Z.Y.Z gate. |
Attributes
is_analysis_pass | Check if the pass is an analysis pass. |
is_transformation_pass | Check if the pass is a transformation pass. |
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.
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).
name
name()
Return the name of the pass.
run
run(dag)
Run the Optimize1qGates pass on dag.
Parameters
dag (DAGCircuit) – the DAG to be optimized.
Returns
the optimized DAG.
Return type
Raises
TranspilerError – if YZY and ZYZ angles do not give same rotation matrix.
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.