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CouplingMap

class CouplingMap(couplinglist=None, description=None)[fuente]

Bases: object

Directed graph specifying fixed coupling.

Nodes correspond to physical qubits (integers) and directed edges correspond to permitted CNOT gates, with source and destination corresponding to control and target qubits, respectively.

Create coupling graph. By default, the generated coupling has no nodes.

Parámetros
  • couplinglist (list or None) – An initial coupling graph, specified as an adjacency list containing couplings, e.g. [[0,1], [0,2], [1,2]]. It is required that nodes are contiguously indexed starting at 0. Missed nodes will be added as isolated nodes in the coupling map.

  • description (str) – A string to describe the coupling map.

Methods

add_edge

Add directed edge to coupling graph.

add_physical_qubit

Add a physical qubit to the coupling graph as a node.

compute_distance_matrix

Compute the full distance matrix on pairs of nodes.

distance

Returns the undirected distance between physical_qubit1 and physical_qubit2.

draw

Draws the coupling map.

from_full

Return a fully connected coupling map on n qubits.

from_grid

Return a coupling map of qubits connected on a grid of num_rows x num_columns.

from_heavy_hex

Return a heavy hexagon graph coupling map.

from_heavy_square

Return a heavy square graph coupling map.

from_hexagonal_lattice

Return a hexagonal lattice graph coupling map.

from_line

Return a coupling map of n qubits connected in a line.

from_ring

Return a coupling map of n qubits connected to each of their neighbors in a ring.

get_edges

Gets the list of edges in the coupling graph.

is_connected

Test if the graph is connected.

largest_connected_component

Return a set of qubits in the largest connected component.

make_symmetric

Convert uni-directional edges into bi-directional.

neighbors

Return the nearest neighbors of a physical qubit.

reduce

Returns a reduced coupling map that corresponds to the subgraph of qubits selected in the mapping.

shortest_undirected_path

Returns the shortest undirected path between physical_qubit1 and physical_qubit2.

size

Return the number of physical qubits in this graph.

subgraph

Return a CouplingMap object for a subgraph of self.

Attributes

description
graph
distance_matrix

Return the distance matrix for the coupling map.

is_symmetric

Test if the graph is symmetric.

Return True if symmetric, False otherwise

physical_qubits

Returns a sorted list of physical_qubits