Parameter

class Parameter(name, uuid=None)

Bases : ParameterExpression

Parameter Class for variable parameters.

A parameter is a variable value that is not required to be fixed at circuit definition.

Exemples

Construct a variable-rotation X gate using circuit parameters.

from qiskit.circuit import QuantumCircuit, Parameter

# create the parameter
phi = Parameter('phi')
qc = QuantumCircuit(1)

# parameterize the rotation
qc.rx(phi, 0)
qc.draw('mpl')

# bind the parameters after circuit to create a bound circuit
bc = qc.bind_parameters({phi: 3.14})
bc.measure_all()
bc.draw('mpl')

(Source code)

Create a new named Parameter.

Paramètres

name – name of the Parameter, used for visual representation. This can be any unicode string, e.g. « ϕ ».

Methods

arccos	Arccos of a ParameterExpression
arcsin	Arcsin of a ParameterExpression
arctan	Arctan of a ParameterExpression
assign	Assign one parameter to a value, which can either be numeric or another parameter expression.
bind	Binds the provided set of parameters to their corresponding values.
conjugate	Return the conjugate.
cos	Cosine of a ParameterExpression
exp	Exponential of a ParameterExpression
gradient	Get the derivative of a parameter expression w.r.t.
is_real	Return whether the expression is real
log	Logarithm of a ParameterExpression
sin	Sine of a ParameterExpression
subs	Substitute self with the corresponding parameter in parameter_map.
sympify	Return symbolic expression as a raw Sympy or Symengine object.
tan	Tangent of a ParameterExpression

Attributes

name

Returns the name of the Parameter.

parameters

Returns a set of the unbound Parameters in the expression.