--- title: Delay (v1.4) description: API reference for qiskit.pulse.instructions.Delay in qiskit v1.4 source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.4/qiskit.pulse.instructions.Delay --- # Delay *class* `qiskit.pulse.instructions.Delay(duration, channel, name=None)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/delay.py#L22-L71) Bases: [`Instruction`](/docs/api/qiskit/1.4/pulse#qiskit.pulse.instructions.Instruction "qiskit.pulse.instructions.instruction.Instruction") A blocking instruction with no other effect. The delay is used for aligning and scheduling other instructions. **Example** To schedule an instruction at time = 10, on a channel assigned to the variable `channel`, the following could be used: ```python sched = Schedule(name="Delay instruction example") sched += Delay(10, channel) sched += Gaussian(duration, amp, sigma, channel) ``` The `channel` will output no signal from time=0 up until time=10. Create a new delay instruction. No other instruction may be scheduled within a `Delay`. > **Deprecated since version 1.3** > > The class `qiskit.pulse.instructions.delay.Delay` is deprecated as of Qiskit 1.3. It will be removed in Qiskit 2.0. The entire Qiskit Pulse package has been deprecated. **Parameters** - **duration** ([*int*](https://docs.python.org/3/library/functions.html#int) *|*[*ParameterExpression*](/docs/api/qiskit/1.4/qiskit.circuit.ParameterExpression "qiskit.circuit.ParameterExpression")) – Length of time of the delay in terms of dt. - **channel** ([*Channel*](/docs/api/qiskit/1.4/pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")) – The channel that will have the delay. - **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str) *| None*) – Name of the delay for display purposes. ## Attributes ### channel Return the [`Channel`](/docs/api/qiskit/1.4/pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel") that this instruction is scheduled on. ### channels Returns the channels that this schedule uses. ### duration Duration of this instruction. ### id Unique identifier for this instruction. ### instructions Iterable for getting instructions from Schedule tree. ### name Name of this instruction. ### operands Return instruction operands. ### parameters Parameters which determine the instruction behavior. ### start\_time Relative begin time of this instruction. ### stop\_time Relative end time of this instruction. ## Methods ### append `append(schedule, name=None)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L187-L200) Return a new [`Schedule`](/docs/api/qiskit/1.4/qiskit.pulse.Schedule "qiskit.pulse.Schedule") with `schedule` inserted at the maximum time over all channels shared between `self` and `schedule`. **Parameters** - **schedule** (*Union\['Schedule', 'Instruction']*) – Schedule or instruction to be appended - **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str) *| None*) – Name of the new schedule. Defaults to name of self **Returns** A new schedule with `schedule` a this instruction at t=0. **Return type** [Schedule](/docs/api/qiskit/1.4/qiskit.pulse.Schedule "qiskit.pulse.Schedule") ### ch\_duration `ch_duration(*channels)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L114-L120) Return duration of the supplied channels in this Instruction. **Parameters** **\*channels** ([*Channel*](/docs/api/qiskit/1.4/pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")) – Supplied channels **Return type** [int](https://docs.python.org/3/library/functions.html#int) ### ch\_start\_time `ch_start_time(*channels)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L122-L129) Return minimum start time for supplied channels. **Parameters** **\*channels** ([*Channel*](/docs/api/qiskit/1.4/pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")) – Supplied channels **Return type** [int](https://docs.python.org/3/library/functions.html#int) ### ch\_stop\_time `ch_stop_time(*channels)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L131-L139) Return maximum start time for supplied channels. **Parameters** **\*channels** ([*Channel*](/docs/api/qiskit/1.4/pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")) – Supplied channels **Return type** [int](https://docs.python.org/3/library/functions.html#int) ### insert `insert(start_time, schedule, name=None)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L169-L185) Return a new [`Schedule`](/docs/api/qiskit/1.4/qiskit.pulse.Schedule "qiskit.pulse.Schedule") with `schedule` inserted within `self` at `start_time`. **Parameters** - **start\_time** ([*int*](https://docs.python.org/3/library/functions.html#int)) – Time to insert the schedule schedule - **schedule** (*Union\['Schedule', 'Instruction']*) – Schedule or instruction to insert - **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str) *| None*) – Name of the new schedule. Defaults to name of self **Returns** A new schedule with `schedule` inserted with this instruction at t=0. **Return type** [Schedule](/docs/api/qiskit/1.4/qiskit.pulse.Schedule "qiskit.pulse.Schedule") ### is\_parameterized `is_parameterized()` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L221-L223) Return True iff the instruction is parameterized. **Return type** [bool](https://docs.python.org/3/library/functions.html#bool) ### shift `shift(time, name=None)` [GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/pulse/instructions/instruction.py#L153-L167) Return a new schedule shifted forward by time. **Parameters** - **time** ([*int*](https://docs.python.org/3/library/functions.html#int)) – Time to shift by - **name** ([*str*](https://docs.python.org/3/library/stdtypes.html#str) *| None*) – Name of the new schedule. Defaults to name of self **Returns** The shifted schedule. **Return type** [Schedule](/docs/api/qiskit/1.4/qiskit.pulse.Schedule "qiskit.pulse.Schedule")