MeasurementPlaceholder

class MeasurementPlaceholder(classical_regs, measurements)

Bases: Gate

Pseudogate to hold measurement information.

__init__(classical_regs, measurements)

Construct a MeasurementPlaceholder.

Parameters:

• classical_regs (list[tuple[str, int]]) – A list of classical register descriptors. Each one is given as a tuple containing its name and size.

• measurements (dict[int, tuple[str, int]]) – A list of measurements made. Measurements are given as a map of qudit index to a tuple containing the classical register’s name and index.

Attributes

dim	The matrix dimension for this unitary.
name	The name of this gate.
num_params	The number of real parameters this unitary-valued function takes.
num_qudits	The number of qudits this unitary can act on.
qasm_name	The qasm identifier for this gate.
radixes	The number of orthogonal states for each qudit.

Methods

check_parameters(params)	Check parameters are valid and match the unitary.
get_inverse()	Return the gate's inverse as a gate.
get_inverse_params([params])	Return the parameters that invert the gate.
get_qasm(params, location)	Returns the qasm string for this gate.
get_qasm_gate_def()	Declares the classical registers.
get_unitary([params])	Map real-valued params to a UnitaryMatrix.
is_constant()	Return true if this unitary doesn't take parameters.
is_parameterized()	Return true if this unitary is parameterized.
is_qubit_only()	Return true if this unitary can only act on qubits.
is_qudit_only(radix)	Return true if this unitary can only act on radix-qudits.
is_qutrit_only()	Return true if this unitary can only act on qutrits.
is_self_inverse([params])	Checks whether the unitary is its own inverse.
with_all_frozen_params(params)	Freeze all of a gate's parameters so they don't change from optimization.
with_frozen_params(frozen_params)	Freeze some of a gate's parameters so they don't change from optimization.