SwitchCaseOp#

class qiskit.circuit.SwitchCaseOp(target, cases, *, label=None)[source]#

Bases: ControlFlowOp

A circuit operation that executes one particular circuit block based on matching a given target against an ordered list of values. The special value CASE_DEFAULT can be used to represent a default condition.

This is the low-level interface for creating a switch-case statement; in general, the circuit method QuantumCircuit.switch() should be used as a context manager to access the builder interface. At the low level, you must ensure that all the circuit blocks contain equal numbers of qubits and clbits, and that the order the virtual bits of the containing circuit should be bound is the same for all blocks. This will likely mean that each circuit block is wider than its natural width, as each block must span the union of all the spaces covered by any of the blocks.

প্যারামিটার:

target (Clbit | ClassicalRegister | expr.Expr) -- the runtime value to switch on.
cases (Iterable[Tuple[Any, QuantumCircuit]]) -- an ordered iterable of the corresponding value of the target and the circuit block that should be executed if this is matched. There is no fall-through between blocks, and the order matters.

Create a new instruction.

প্যারামিটার:

name (str) -- instruction name
num_qubits (int) -- instruction's qubit width
num_clbits (int) -- instruction's clbit width
params (list[int|float|complex|str|ndarray|list|ParameterExpression]) -- list of parameters
duration (int or float) -- instruction's duration. it must be integer if unit is 'dt'
unit (str) -- time unit of duration
label (str or None) -- An optional label for identifying the instruction.

রেইজেস:

CircuitError -- when the register is not in the correct format.
TypeError -- when the optional label is provided, but it is not a string.

Attributes

blocks#

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

name#: Return the name.

num_clbits#: Return the number of clbits.

num_qubits#: Return the number of qubits.

params#: return instruction params.

unit#: Get the time unit of duration.

Methods

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

assemble()#: Assemble a QasmQobjInstruction

broadcast_arguments(qargs, cargs)#

Validation of the arguments.

প্যারামিটার:

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

Yields:

Tuple(List, List) -- A tuple with single arguments.

রেইজেস:

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

c_if(classical, val)[source]#: Set a classical equality condition on this instruction between the register or cbit classical and value val.

নোট

This is a setter method, not an additive one. Calling this multiple times will silently override any previously set condition; it does not stack.

cases()[source]#

Return a lookup table from case labels to the circuit that would be executed in that case. This object is not generally suitable for creating a new SwitchCaseOp because any keys that point to the same object will not be grouped.

আরও দেখুন

SwitchCaseOp.cases_specifier(): An alternate method that produces its output in a suitable format for creating new SwitchCaseOp instances.

cases_specifier()[source]#

Return an iterable where each element is a 2-tuple whose first element is a tuple of jump values, and whose second is the single circuit block that is associated with those values.

This is an abstract specification of the jump table suitable for creating new SwitchCaseOp instances.

আরও দেখুন

SwitchCaseOp.cases(): Create a lookup table that you can use for your own purposes to jump from values to the circuit that would be executed.

রিটার্ন টাইপ:: Iterable[Tuple[Tuple, QuantumCircuit]]

copy(name=None)#

Copy of the instruction.

প্যারামিটার:: name (str) -- name to be given to the copied circuit, if None then the name stays the same.
রিটার্নস:: a copy of the current instruction, with the name updated if it was provided
রিটার্ন টাইপ:: qiskit.circuit.Instruction

inverse()#

Invert this instruction.

If the instruction is composite (i.e. has a definition), then its definition will be recursively inverted.

Special instructions inheriting from Instruction can implement their own inverse (e.g. T and Tdg, Barrier, etc.)

রিটার্নস:: a fresh instruction for the inverse
রিটার্ন টাইপ:: qiskit.circuit.Instruction
রেইজেস:: CircuitError -- if the instruction is not composite and an inverse has not been implemented for it.

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

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];).

0.25.0 ভার্সন থেকে ডেপ্রিকেটেড: The method qiskit.circuit.instruction.Instruction.qasm() is deprecated as of qiskit-terra 0.25.0. It will be removed no earlier than 3 months after the release date. Correct exporting to OpenQASM 2 is the responsibility of a larger exporter; it cannot safely be done on an object-by-object basis without context. No replacement will be provided, because the premise is wrong.

repeat(n)#

Creates an instruction with gate repeated n amount of times.

প্যারামিটার:: n (int) -- Number of times to repeat the instruction
রিটার্নস:: Containing the definition.
রিটার্ন টাইপ:: qiskit.circuit.Instruction
রেইজেস:: CircuitError -- If n < 1.

replace_blocks(blocks)[source]#

Replace blocks and return new instruction. :param blocks: Tuple of QuantumCircuits to replace in instruction.

রিটার্নস:: New ControlFlowOp with replaced blocks.
রিটার্ন টাইপ:: SwitchCaseOp

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.

রিটার্নস:

a new instruction with: sub-instructions reversed.

রিটার্ন টাইপ:

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.

প্যারামিটার:: other (instruction) -- other instruction.
রিটার্নস:: are self and other equal up to parameter expressions.
রিটার্ন টাইপ:: bool

validate_parameter(parameter)#: Instruction parameters has no validation or normalization.