Tunable pulse for entangling adjacent qubits.

For experimental usage only.

This operation sends a trapezoidal pulse to the coupler between two adjacent qubits placed in resonance.

Note that this gate does not have a unitary matrix and must be characterized by the user in order to determine its effects.

                /          \
_______________/            \________________
 |<---------->|  |<------>|  |<----------->|
  padding_time   hold_time     padding_time
             ->  <-      ->   <-
            rise_time   rise_time

hold_time Length of the 'plateau' part of the coupler trajectory.
coupling_mhz Target qubit-qubit coupling reached at the plateau.
rise_time Width of the rising (or falling) section of the trapezoidal pulse.
padding_time Symmetric padding around the coupler pulse.

ValueError If any time is negative or if the total pulse is too long.



Returns a controlled version of this gate. If no arguments are specified, defaults to a single qubit control.

num_controls: Total number of control qubits. control_values: For which control qubit values to apply the sub gate. A sequence of length num_controls where each entry is an integer (or set of integers) corresponding to the qubit value (or set of possible values) where that control is enabled. When all controls are enabled, the sub gate is applied. If unspecified, control values default to 1. control_qid_shape: The qid shape of the controls. A tuple of the expected dimension of each control qid. Defaults to (2,) * num_controls. Specify this argument when using qudits.


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The number of qubits this gate acts on.


Returns an application of this gate to the given qubits.

*qubits The collection of qubits to potentially apply the gate to.


Returns a list of operations applying the gate to all targets.

*targets The qubits to apply this gate to. For single-qubit gates this can be provided as varargs or a combination of nested iterables. For multi-qubit gates this must be provided as an Iterable[Sequence[Qid]], where each sequence has num_qubits qubits.

Operations applying this gate to the target qubits.

ValueError If targets are not instances of Qid or Iterable[Qid]. If the gate qubit number is incompatible.
TypeError If a single target is supplied and it is not iterable.


Checks if this gate can be applied to the given qubits.

By default checks that:

  • inputs are of type Qid
  • len(qubits) == num_qubits()
  • qubit_i.dimension == qid_shape[i] for all qubits

Child classes can override. The child implementation should call super().validate_args(qubits) then do custom checks.

qubits The sequence of qubits to potentially apply the gate to.


  • ValueError: The gate can't be applied to the qubits.





Call self as a function.