SingleQubitQPDGate¶
- class SingleQubitQPDGate(basis, qubit_id, *, basis_id=None, label=None)[source]¶
Bases:
BaseQPDGate
Single qubit gate to be decomposed using quasiprobability decomposition.
This gate could be part of a larger decomposition on many qubits, or it could be a standalone single gate decomposition.
Initialize the single qubit QPD gate, and assign member variables.
- Parameters:
basis (QPDBasis) – A
QPDBasis
to which the gate should be decomposedqubit_id (int) – This gate’s relative index to the decomposition which it belongs. Single qubit QPDGates should have qubit_id 0 if they describe a local decomposition, such as a wire cut.
basis_id (int | None) – An index to the basis to which the gate should be decomposed. This index is to
basis.maps
.label (str | None) – An optional label for the gate
- Raises:
ValueError – qubit_id is out of range
Attributes
- base_class¶
Get the base class of this instruction. This is guaranteed to be in the inheritance tree of
self
.The “base class” of an instruction is the lowest class in its inheritance tree that the object should be considered entirely compatible with for _all_ circuit applications. This typically means that the subclass is defined purely to offer some sort of programmer convenience over the base class, and the base class is the “true” class for a behavioral perspective. In particular, you should not override
base_class
if you are defining a custom version of an instruction that will be implemented differently by hardware, such as an alternative measurement strategy, or a version of a parametrized gate with a particular set of parameters for the purposes of distinguishing it in aTarget
from the full parametrized gate.This is often exactly equivalent to
type(obj)
, except in the case of singleton instances of standard-library instructions. These singleton instances are special subclasses of their base class, and this property will return that base. For example:>>> isinstance(XGate(), XGate) True >>> type(XGate()) is XGate False >>> XGate().base_class is XGate True
In general, you should not rely on the precise class of an instruction; within a given circuit, it is expected that
Instruction.name
should be a more suitable discriminator in most situations.
- basis¶
Quasiprobability decomposition basis.
- Returns:
The basis to which the gate should be decomposed
- basis_id¶
Index to basis used to decompose this gate.
If set to None, a random basis will be chosen during decomposition.
- Returns:
The basis index
- condition¶
The classical condition on the instruction.
- condition_bits¶
Get Clbits in condition.
- 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 instruction label
- mutable¶
Is this instance is a mutable unique instance or not.
If this attribute is
False
the gate instance is a shared singleton and is not mutable.
- name¶
Return the name.
- num_clbits¶
Return the number of clbits.
- num_qubits¶
Return the number of qubits.
- params¶
The parameters of this
Instruction
. Ideally these will be gate angles.
- qubit_id¶
Relative qubit index of this gate in the overall decomposition.
- unit¶
Get the time unit of duration.
Methods
- add_decomposition(decomposition)¶
Add a decomposition of the instruction to the SessionEquivalenceLibrary.
- assemble()¶
Assemble a QasmQobjInstruction
Deprecated since version 1.2: The method
qiskit.circuit.instruction.Instruction.assemble()
is deprecated as of qiskit 1.2. It will be removed in the 2.0 release. The Qobj class and related functionality are part of the deprecated BackendV1 workflow, and no longer necessary for BackendV2. If a user workflow requires Qobj it likely relies on deprecated functionality and should be updated to use BackendV2.
- broadcast_arguments(qargs, cargs)¶
Validation of the arguments.
- Parameters:
qargs (List) – List of quantum bit arguments.
cargs (List) – List of classical bit arguments.
- Yields:
Tuple(List, List) – A tuple with single arguments.
- Raises:
CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.
- c_if(classical, val)¶
Set a classical equality condition on this instruction between the register or cbit
classical
and valueval
.Note
This is a setter method, not an additive one. Calling this multiple times will silently override any previously set condition; it does not stack.
- copy(name=None)¶
Copy of the instruction.
- Parameters:
name (str) – name to be given to the copied circuit, if
None
then the name stays the same.- Returns:
a copy of the current instruction, with the name updated if it was provided
- Return type:
- inverse(annotated=False)¶
Invert this instruction.
If annotated is False, the inverse instruction is implemented as a fresh instruction with the recursively inverted definition.
If annotated is True, the inverse instruction is implemented as
AnnotatedOperation
, and corresponds to the given instruction annotated with the “inverse modifier”.Special instructions inheriting from Instruction can implement their own inverse (e.g. T and Tdg, Barrier, etc.) In particular, they can choose how to handle the argument
annotated
which may include ignoring it and always returning a concrete gate class if the inverse is defined as a standard gate.- Parameters:
annotated (
bool
) – if set to True the output inverse gate will be returned asAnnotatedOperation
.- Returns:
The inverse operation.
- Raises:
CircuitError – if the instruction is not composite and an inverse has not been implemented for it.
- is_parameterized()¶
Return whether the
Instruction
contains compile-time parameters.
- repeat(n)¶
Creates an instruction with
self
repeated :math`n` times.If this operation has a conditional, the output instruction will have the same conditional and the inner repeated operations will be unconditional; instructions within a compound definition cannot be conditioned on registers within Qiskit’s data model. This means that it is not valid to apply a repeated instruction to a clbit that it both writes to and reads from in its condition.
- Parameters:
n (int) – Number of times to repeat the instruction
- Returns:
Containing the definition.
- Return type:
- Raises:
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.
- Returns:
- a new instruction with
sub-instructions reversed.
- Return type:
- 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.
- Parameters:
other (instruction) – other instruction.
- Returns:
are self and other equal up to parameter expressions.
- Return type:
- to_mutable()¶
Return a mutable copy of this gate.
This method will return a new mutable copy of this gate instance. If a singleton instance is being used this will be a new unique instance that can be mutated. If the instance is already mutable it will be a deepcopy of that instance.
- validate_parameter(parameter)¶
Instruction parameters has no validation or normalization.