qiskit.circuit.library.RXGate¶

class RXGate(theta, label=None)[código fonte]¶

Single-qubit rotation about the X axis.

Circuit symbol:

     ┌───────┐
q_0: ┤ Rx(ϴ) ├
     └───────┘

Matrix Representation:

$\begin{align}\begin{aligned}\newcommand{\th}{\frac{\theta}{2}}\\\begin{split}RX(\theta) = exp(-i \th X) = \begin{pmatrix} \cos{\th} & -i\sin{\th} \\ -i\sin{\th} & \cos{\th} \end{pmatrix}\end{split}\end{aligned}\end{align}$

Create new RX gate.

__init__(theta, label=None)[código fonte]¶: Create new RX gate.

Methods

`__init__`(theta[, label])	Create new RX gate.
`add_decomposition`(decomposition)	Add a decomposition of the instruction to the SessionEquivalenceLibrary.
`assemble`()	Assemble a QasmQobjInstruction
`broadcast_arguments`(qargs, cargs)	Validation and handling of the arguments and its relationship.
`c_if`(classical, val)	Add classical condition on register classical and value val.
`control`([num_ctrl_qubits, label, ctrl_state])	Return a (multi-)controlled-RX gate.
`copy`([name])	Copy of the instruction.
`inverse`()	Return inverted RX gate.
`is_parameterized`()	Return True .IFF.
`mirror`()	DEPRECATED: use instruction.reverse_ops().
`power`(exponent)	Creates a unitary gate as gate^exponent.
`qasm`()	Return a default OpenQASM string for the instruction.
`repeat`(n)	Creates an instruction with gate repeated n amount of times.
`reverse_ops`()	For a composite instruction, reverse the order of sub-instructions.
`soft_compare`(other)	Soft comparison between gates.
`to_matrix`()	Return a Numpy.array for the gate unitary matrix.
`validate_parameter`(parameter)	Gate parameters should be int, float, or ParameterExpression

Attributes

`decompositions`	Get the decompositions of the instruction from the SessionEquivalenceLibrary.
`definition`	Return definition in terms of other basic gates.
`duration`	Get the duration.
`label`	Return gate label
`params`	return instruction params.
`unit`	Get the time unit of duration.

add_decomposition(decomposition)¶: Add a decomposition of the instruction to the SessionEquivalenceLibrary.

assemble()¶

Assemble a QasmQobjInstruction

Tipo de retorno: Instruction

broadcast_arguments(qargs, cargs)¶

Validation and handling of the arguments and its relationship.

For example, cx([q[0],q[1]], q[2]) means cx(q[0], q[2]); cx(q[1], q[2]). This method yields the arguments in the right grouping. In the given example:

in: [[q[0],q[1]], q[2]],[]
outs: [q[0], q[2]], []
      [q[1], q[2]], []

The general broadcasting rules are:

If len(qargs) == 1:
```
[q[0], q[1]] -> [q[0]],[q[1]]
```

If len(qargs) == 2:

[[q[0], q[1]], [r[0], r[1]]] -> [q[0], r[0]], [q[1], r[1]]
[[q[0]], [r[0], r[1]]]       -> [q[0], r[0]], [q[0], r[1]]
[[q[0], q[1]], [r[0]]]       -> [q[0], r[0]], [q[1], r[0]]

If len(qargs) >= 3:

[q[0], q[1]], [r[0], r[1]],  ...] -> [q[0], r[0], ...], [q[1], r[1], ...]

Parâmetros

qargs (List) – List of quantum bit arguments.
cargs (List) – List of classical bit arguments.

Tipo de retorno

Tuple[List, List]

Retorna

A tuple with single arguments.

Levanta

CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.

c_if(classical, val)¶: Add classical condition on register classical and value val.

control(num_ctrl_qubits=1, label=None, ctrl_state=None)[código fonte]¶

Return a (multi-)controlled-RX gate.

Parâmetros

num_ctrl_qubits (int) – number of control qubits.
label (str or None) – An optional label for the gate [Default: None]
ctrl_state (int or str or None) – control state expressed as integer, string (e.g. ‘110’), or None. If None, use all 1s.

Retorna

controlled version of this gate.

Tipo de retorno

ControlledGate

copy(name=None)¶

Copy of the instruction.

Parâmetros

name (str) – name to be given to the copied circuit, if None then the name stays the same.

Retorna

a copy of the current instruction, with the name: updated if it was provided

Tipo de retorno

qiskit.circuit.Instruction

property decompositions¶: Get the decompositions of the instruction from the SessionEquivalenceLibrary.

property definition¶: Return definition in terms of other basic gates.

property duration¶: Get the duration.

inverse()[código fonte]¶

Return inverted RX gate.

$RX(\lambda)^{\dagger} = RX(-\lambda)$

is_parameterized()¶: Return True .IFF. instruction is parameterized else False

property label¶

Return gate label

Tipo de retorno: str

mirror()¶

DEPRECATED: use instruction.reverse_ops().

Retorna

a new instruction with sub-instructions: reversed.

Tipo de retorno

qiskit.circuit.Instruction

property params¶: return instruction params.

power(exponent)¶

Creates a unitary gate as gate^exponent.

Parâmetros: exponent (float) – Gate^exponent
Retorna: To which to_matrix is self.to_matrix^exponent.
Tipo de retorno: qiskit.extensions.UnitaryGate
Levanta: CircuitError – If Gate is not unitary

qasm()¶

Return a default OpenQASM string for the instruction.

Derived instructions may override this to print in a different format (e.g. measure q[0] -> c[0];).

repeat(n)¶

Creates an instruction with gate repeated n amount of times.

Parâmetros: n (int) – Number of times to repeat the instruction
Retorna: Containing the definition.
Tipo de retorno: qiskit.circuit.Instruction
Levanta: CircuitError – If n < 1.

reverse_ops()¶

For a composite instruction, reverse the order of sub-instructions.

This is done by recursively reversing all sub-instructions. It does not invert any gate.

Retorna

a new instruction with: sub-instructions reversed.

Tipo de retorno

qiskit.circuit.Instruction

soft_compare(other)¶

Soft comparison between gates. Their names, number of qubits, and classical bit numbers must match. The number of parameters must match. Each parameter is compared. If one is a ParameterExpression then it is not taken into account.

Parâmetros: other (instruction) – other instruction.
Retorna: are self and other equal up to parameter expressions.
Tipo de retorno: bool

to_matrix()¶

Return a Numpy.array for the gate unitary matrix.

Retorna: if the Gate subclass has a matrix definition.
Tipo de retorno: np.ndarray
Levanta: CircuitError – If a Gate subclass does not implement this method an exception will be raised when this base class method is called.

property unit¶: Get the time unit of duration.

validate_parameter(parameter)¶: Gate parameters should be int, float, or ParameterExpression