mindquantum.algorithm.compiler.DAGCircuit

class mindquantum.algorithm.compiler.DAGCircuit(circuit: Circuit)[source]

A Directed Acyclic Graph of a quantum circuit.

Parameters: circuit (Circuit) – the input quantum circuit.

Examples

>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> from mindquantum.core.circuit import Circuit
>>> circ = Circuit().h(0).x(1, 0)
>>> dag_circ = DAGCircuit(circ)
>>> dag_circ.head_node[0]
q0
>>> dag_circ.head_node[0].child
{0: H(0)}

append_node(node: DAGNode)[source]

Append a quantum gate node.

Parameters: node (DAGNode) – the DAG node you want to append.

Examples

>>> from mindquantum.algorithm.compiler import DAGCircuit, GateNode
>>> from mindquantum.core.circuit import Circuit
>>> import mindquantum.core.gates as G
>>> circ = Circuit().h(0).x(1, 0)
>>> circ
      ┏━━━┓
q0: ──┨ H ┠───■─────
      ┗━━━┛   ┃
            ┏━┻━┓
q1: ────────┨╺╋╸┠───
            ┗━━━┛
>>> dag_circ = DAGCircuit(circ)
>>> node = GateNode(G.RX('a').on(0, 2))
>>> dag_circ.append_node(node)
>>> dag_circ.to_circuit()
      ┏━━━┓       ┏━━━━━━━┓
q0: ──┨ H ┠───■───┨ RX(a) ┠───
      ┗━━━┛   ┃   ┗━━━┳━━━┛
            ┏━┻━┓     ┃
q1: ────────┨╺╋╸┠─────╂───────
            ┗━━━┛     ┃
                      ┃
q2: ──────────────────■───────

depth()[source]

Return the depth of quantum circuit.

Examples

>>> from mindquantum.core.circuit import Circuit
>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> circ = Circuit().h(0).h(1).x(1, 0)
>>> circ
      ┏━━━┓
q0: ──┨ H ┠───■─────
      ┗━━━┛   ┃
      ┏━━━┓ ┏━┻━┓
q1: ──┨ H ┠─┨╺╋╸┠───
      ┗━━━┛ ┗━━━┛
>>> DAGCircuit(circ).depth()
2

find_all_gate_node()[source]

Find all gate node in this DAGCircuit.

Returns: List[GateNode], a list of all GateNode of this DAGCircuit.

Examples

>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> from mindquantum.core.circuit import Circuit
>>> circ = Circuit().h(0).x(1, 0)
>>> dag_circ = DAGCircuit(circ)
>>> dag_circ.find_all_gate_node()
[H(0), X(1 <-: 0)]

layering()[source]

Layering the quantum circuit.

Returns: List[Circuit], a list of layered quantum circuit.

Examples

>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> from mindquantum.utils import random_circuit
>>> circ = random_circuit(3, 5, seed=42)
>>> circ
      ┏━━━━━━━━━━━━━┓   ┏━━━━━━━━━━━━━┓
q0: ──┨             ┠─╳─┨ RY(-6.1944) ┠───────────────────
      ┃             ┃ ┃ ┗━━━━━━┳━━━━━━┛
      ┃ Rxx(1.2171) ┃ ┃        ┃        ┏━━━━━━━━━━━━━┓
q1: ──┨             ┠─┃────────╂────────┨             ┠───
      ┗━━━━━━━━━━━━━┛ ┃        ┃        ┃             ┃
      ┏━━━━━━━━━━━━┓  ┃        ┃        ┃ Rzz(-0.552) ┃
q2: ──┨ PS(2.6147) ┠──╳────────■────────┨             ┠───
      ┗━━━━━━━━━━━━┛                    ┗━━━━━━━━━━━━━┛
>>> dag_circ = DAGCircuit(circ)
>>> for idx, c in enumerate(dag_circ.layering()):
...     print(f"layer {idx}:")
...     print(c)
layer 0:
      ┏━━━━━━━━━━━━━┓
q0: ──┨             ┠───
      ┃             ┃
      ┃ Rxx(1.2171) ┃
q1: ──┨             ┠───
      ┗━━━━━━━━━━━━━┛
      ┏━━━━━━━━━━━━┓
q2: ──┨ PS(2.6147) ┠────
      ┗━━━━━━━━━━━━┛
layer 1:
q0: ──╳───
      ┃
      ┃
q2: ──╳───
layer 2:
      ┏━━━━━━━━━━━━━┓
q0: ──┨ RY(-6.1944) ┠───
      ┗━━━━━━┳━━━━━━┛
             ┃
q2: ─────────■──────────
layer 3:
      ┏━━━━━━━━━━━━━┓
q1: ──┨             ┠───
      ┃             ┃
      ┃ Rzz(-0.552) ┃
q2: ──┨             ┠───
      ┗━━━━━━━━━━━━━┛

static replace_node_with_dag_circuit(node: DAGNode, coming: 'DAGCircuit')[source]

Replace a node with a DAGCircuit.

Parameters

node (DAGNode) – the original DAG node.
coming (DAGCircuit) – the coming DAG circuit.

Examples

>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> from mindquantum.core.circuit import Circuit
>>> circ = Circuit().x(1, 0)
>>> circ
q0: ────■─────
        ┃
      ┏━┻━┓
q1: ──┨╺╋╸┠───
      ┗━━━┛
>>> dag_circ = DAGCircuit(circ)
>>> node = dag_circ.head_node[0].child[0]
>>> node
X(1 <-: 0)
>>> sub_dag = DAGCircuit(Circuit().h(1).z(1, 0).h(1))
>>> DAGCircuit.replace_node_with_dag_circuit(node, sub_dag)
>>> dag_circ.to_circuit()
q0: ──────────■───────────
              ┃
      ┏━━━┓ ┏━┻━┓ ┏━━━┓
q1: ──┨ H ┠─┨ Z ┠─┨ H ┠───
      ┗━━━┛ ┗━━━┛ ┗━━━┛

to_circuit()[source]

Convert DAGCircuit to quantum circuit.

Returns: Circuit, the quantum circuit of this DAG.

Examples

>>> from mindquantum.core.circuit import Circuit
>>> from mindquantum.algorithm.compiler import DAGCircuit
>>> circ = Circuit().h(0).h(1).x(1, 0)
>>> circ
      ┏━━━┓
q0: ──┨ H ┠───■─────
      ┗━━━┛   ┃
      ┏━━━┓ ┏━┻━┓
q1: ──┨ H ┠─┨╺╋╸┠───
      ┗━━━┛ ┗━━━┛
>>> dag_circ = DAGCircuit(circ)
>>> dag_circ.to_circuit()
      ┏━━━┓
q0: ──┨ H ┠───■─────
      ┗━━━┛   ┃
      ┏━━━┓ ┏━┻━┓
q1: ──┨ H ┠─┨╺╋╸┠───
      ┗━━━┛ ┗━━━┛