CZGate¶
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class
CZGate(label=None, ctrl_state=None)[source]¶ Bases:
qiskit.circuit.controlledgate.ControlledGateControlled-Z gate.
This is a Clifford and symmetric gate.
Circuit symbol:
q_0: ─■─ │ q_1: ─■─Matrix representation:
\[\begin{split}CZ\ q_1, q_0 = |0\rangle\langle 0| \otimes I + |1\rangle\langle 1| \otimes Z = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & -1 \end{pmatrix}\end{split}\]In the computational basis, this gate flips the phase of the target qubit if the control qubit is in the \(|1\rangle\) state.
Create new CZ gate.
Methods Defined Here
Return inverted CZ gate (itself).
Attributes
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ctrl_state¶ Return the control state of the gate as a decimal integer.
- Return type
int
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decompositions¶ Get the decompositions of the instruction from the SessionEquivalenceLibrary.
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definition¶ Return definition in terms of other basic gates. If the gate has open controls, as determined from self.ctrl_state, the returned definition is conjugated with X without changing the internal _definition.
- Return type
List
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duration¶ Get the duration.
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label¶ Return instruction label
- Return type
str
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name¶ Get name of gate. If the gate has open controls the gate name will become:
<original_name_o<ctrl_state>
where <original_name> is the gate name for the default case of closed control qubits and <ctrl_state> is the integer value of the control state for the gate.
- Return type
str
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num_ctrl_qubits¶ Get number of control qubits.
- Returns
The number of control qubits for the gate.
- Return type
int
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params¶ Get parameters from base_gate.
- Returns
List of gate parameters.
- Return type
list
- Raises
CircuitError – Controlled gate does not define a base gate
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unit¶ Get the time unit of duration.
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