CZGate#
- class qiskit.circuit.library.CZGate(label=None, ctrl_state=None)[source]#
Bases:
ControlledGateControlled-Z gate.
This is a Clifford and symmetric gate.
Can be applied to a
QuantumCircuitwith thecz()method.Circuit symbol:
q_0: ─■─ │ q_1: ─■─Matrix representation:
\[\begin{split}CZ\ q_0, q_1 = I \otimes |0\rangle\langle 0| + Z \otimes |1\rangle\langle 1| = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & -1 \end{pmatrix}\end{split}\]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.
Attributes
- condition_bits#
Get Clbits in condition.
- ctrl_state#
Return the control state of the gate as a decimal integer.
- decompositions#
Get the decompositions of the instruction from the SessionEquivalenceLibrary.
- 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.
- duration#
Get the duration.
- label#
Return instruction label
- 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.
- num_clbits#
Return the number of clbits.
- num_ctrl_qubits#
Get number of control qubits.
- Returns:
The number of control qubits for the gate.
- Return type:
- num_qubits#
Return the number of qubits.
- params#
Get parameters from base_gate.
- Returns:
List of gate parameters.
- Return type:
- Raises:
CircuitError -- Controlled gate does not define a base gate
- unit#
Get the time unit of duration.
Methods