mindquantum.algorithm.compiler.U3Fusion

class mindquantum.algorithm.compiler.U3Fusion(rule_name='U3Fusion', log_level=0, with_global_phase=False)

Fuse consecutive single qubit gates into one U3 gate.

This rule scans through the circuit and combines consecutive single qubit gates acting on the same qubit into a single U3 gate. For standalone single qubit gates, they will also be converted to U3 form.

Optionally, it can also track and include the global phase.

Parameters

• rule_name (str) – Name of this compiler rule. Default: "U3Fusion"

• log_level (int) – Display log level. Default: 0

• with_global_phase (bool) – Whether to include global phase gate. Default: False

Examples

>>> from mindquantum.algorithm.compiler import U3Fusion, DAGCircuit
>>> from mindquantum.core.circuit import Circuit
>>> circ = Circuit().rx(1.0, 0).ry(0.5, 0).rz(0.7, 0)
>>> circ
      ┏━━━━━━━┓ ┏━━━━━━━━━┓ ┏━━━━━━━━━┓
q0: ──┨ RX(1) ┠─┨ RY(1/2) ┠─┨ RZ(0.7) ┠───
      ┗━━━━━━━┛ ┗━━━━━━━━━┛ ┗━━━━━━━━━┛
>>> dag_circ = DAGCircuit(circ)
>>> compiler = U3Fusion()
>>> compiler.do(dag_circ)
>>> dag_circ.to_circuit()
      ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
q0: ──┨ U3(θ=1.0768, φ=-0.5722, λ=0.995) ┠───
      ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

do(dag_circuit: DAGCircuit)

Apply single qubit gate fusion to the circuit.

Parameters

dag_circuit (DAGCircuit) – Input circuit in DAG form

Returns

True if any fusion was performed, False otherwise

Return type

bool