qiskit.circuit.library.ZGate¶
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class
ZGate
(label=None)[ソース]¶ The single-qubit Pauli-Z gate (\(\sigma_z\)).
Matrix Representation:
\[\begin{split}Z = \begin{pmatrix} 1 & 0 \\ 0 & -1 \end{pmatrix}\end{split}\]Circuit symbol:
┌───┐ q_0: ┤ Z ├ └───┘
Equivalent to a \(\pi\) radian rotation about the Z axis.
注釈
A global phase difference exists between the definitions of \(RZ(\pi)\) and \(Z\).
\[\begin{split}RZ(\pi) = \begin{pmatrix} -1 & 0 \\ 0 & 1 \end{pmatrix} = -Z\end{split}\]The gate is equivalent to a phase flip.
\[\begin{split}|0\rangle \rightarrow |0\rangle \\ |1\rangle \rightarrow -|1\rangle\end{split}\]Create new Z gate.
Methods
__init__
([label])Create new Z 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 (mutli-)controlled-Z gate.
copy
([name])Copy of the instruction.
inverse
()Return inverted Z gate (itself).
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.
For a composite instruction, reverse the order of sub-instructions.
Return a numpy.array for the Z gate.
validate_parameter
(parameter)Gate parameters should be int, float, or ParameterExpression
Attributes
Get the decompositions of the instruction from the SessionEquivalenceLibrary.
Return definition in terms of other basic gates.
Get the duration.
Return gate label
return instruction params.
Get the time unit of duration.
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add_decomposition
(decomposition)¶ Add a decomposition of the instruction to the SessionEquivalenceLibrary.
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assemble
()¶ Assemble a QasmQobjInstruction
- 戻り値の型
Instruction
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broadcast_arguments
(qargs, cargs)¶ Validation and handling of the arguments and its relationship.
For example,
cx([q[0],q[1]], q[2])
meanscx(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], ...]
- パラメータ
qargs (
List
) – List of quantum bit arguments.cargs (
List
) – List of classical bit arguments.
- 戻り値の型
Tuple
[List
,List
]- 戻り値
A tuple with single arguments.
- 例外
CircuitError – If the input is not valid. For example, the number of arguments does not match the gate expectation.
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c_if
(classical, val)¶ Add classical condition on register classical and value val.
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control
(num_ctrl_qubits=1, label=None, ctrl_state=None)[ソース]¶ Return a (mutli-)controlled-Z gate.
One control returns a CZ gate.
- パラメータ
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.
- 戻り値
controlled version of this gate.
- 戻り値の型
-
copy
(name=None)¶ Copy of the instruction.
- パラメータ
name (str) – name to be given to the copied circuit, if None then the name stays the same.
- 戻り値
- a copy of the current instruction, with the name
updated if it was provided
- 戻り値の型
-
property
decompositions
¶ Get the decompositions of the instruction from the SessionEquivalenceLibrary.
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property
definition
¶ Return definition in terms of other basic gates.
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property
duration
¶ Get the duration.
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is_parameterized
()¶ Return True .IFF. instruction is parameterized else False
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property
label
¶ Return gate label
- 戻り値の型
str
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mirror
()¶ DEPRECATED: use instruction.reverse_ops().
- 戻り値
- a new instruction with sub-instructions
reversed.
- 戻り値の型
-
property
params
¶ return instruction params.
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power
(exponent)¶ Creates a unitary gate as gate^exponent.
- パラメータ
exponent (float) – Gate^exponent
- 戻り値
To which to_matrix is self.to_matrix^exponent.
- 戻り値の型
- 例外
CircuitError – If Gate is not unitary
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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];).
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repeat
(n)¶ Creates an instruction with gate repeated n amount of times.
- パラメータ
n (int) – Number of times to repeat the instruction
- 戻り値
Containing the definition.
- 戻り値の型
- 例外
CircuitError – If n < 1.
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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.
- 戻り値
- a new instruction with
sub-instructions reversed.
- 戻り値の型
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property
unit
¶ Get the time unit of duration.
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validate_parameter
(parameter)¶ Gate parameters should be int, float, or ParameterExpression
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