282 lines
7.7 KiB
Plaintext
282 lines
7.7 KiB
Plaintext
---
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title: Delay
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description: API reference for qiskit.pulse.instructions.Delay
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.pulse.instructions.Delay
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---
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# Delay
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<Class id="qiskit.pulse.instructions.Delay" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.20/qiskit/pulse/instructions/delay.py" signature="Delay(duration, channel, name=None)" modifiers="class">
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Bases: `qiskit.pulse.instructions.instruction.Instruction`
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A blocking instruction with no other effect. The delay is used for aligning and scheduling other instructions.
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**Example**
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To schedule an instruction at time = 10, on a channel assigned to the variable `channel`, the following could be used:
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```python
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sched = Schedule(name="Delay instruction example")
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sched += Delay(10, channel)
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sched += Gaussian(duration, amp, sigma, channel)
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```
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The `channel` will output no signal from time=0 up until time=10.
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Create a new delay instruction.
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No other instruction may be scheduled within a `Delay`.
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**Parameters**
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* **duration** (`Union`\[`int`, `ParameterExpression`]) – Length of time of the delay in terms of dt.
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* **channel** ([`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")) – The channel that will have the delay.
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* **name** (`Optional`\[`str`]) – Name of the delay for display purposes.
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## Methods
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### append
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<Function id="qiskit.pulse.instructions.Delay.append" signature="Delay.append(schedule, name=None)">
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Return a new [`Schedule`](qiskit.pulse.Schedule "qiskit.pulse.Schedule") with `schedule` inserted at the maximum time over all channels shared between `self` and `schedule`.
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**Parameters**
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* **schedule** (*Union\['Schedule', 'Instruction']*) – Schedule or instruction to be appended
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* **name** (`Optional`\[`str`]) – Name of the new schedule. Defaults to name of self
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**Returns**
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A new schedule with `schedule` a this instruction at t=0.
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**Return type**
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[Schedule](qiskit.pulse.Schedule "qiskit.pulse.Schedule")
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</Function>
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### ch\_duration
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<Function id="qiskit.pulse.instructions.Delay.ch_duration" signature="Delay.ch_duration(*channels)">
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Return duration of the supplied channels in this Instruction.
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**Parameters**
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**\*channels** – Supplied channels
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**Return type**
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`int`
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</Function>
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### ch\_start\_time
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<Function id="qiskit.pulse.instructions.Delay.ch_start_time" signature="Delay.ch_start_time(*channels)">
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Return minimum start time for supplied channels.
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**Parameters**
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**\*channels** – Supplied channels
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**Return type**
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`int`
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</Function>
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### ch\_stop\_time
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<Function id="qiskit.pulse.instructions.Delay.ch_stop_time" signature="Delay.ch_stop_time(*channels)">
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Return maximum start time for supplied channels.
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**Parameters**
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**\*channels** – Supplied channels
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**Return type**
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`int`
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</Function>
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### draw
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<Function id="qiskit.pulse.instructions.Delay.draw" signature="Delay.draw(dt=1, style=None, filename=None, interp_method=None, scale=1, plot_all=False, plot_range=None, interactive=False, table=True, label=False, framechange=True, channels=None)">
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Plot the instruction.
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**Parameters**
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* **dt** (`float`) – Time interval of samples
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* **style** (*Optional\[SchedStyle]*) – A style sheet to configure plot appearance
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* **filename** (`Optional`\[`str`]) – Name required to save pulse image
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* **interp\_method** (`Optional`\[`Callable`]) – A function for interpolation
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* **scale** (`float`) – Relative visual scaling of waveform amplitudes
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* **plot\_all** (`bool`) – Plot empty channels
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* **plot\_range** (`Optional`\[`Tuple`\[`float`]]) – A tuple of time range to plot
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* **interactive** (`bool`) – When set true show the circuit in a new window (this depends on the matplotlib backend being used supporting this)
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* **table** (`bool`) – Draw event table for supported instructions
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* **label** (`bool`) – Label individual instructions
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* **framechange** (`bool`) – Add framechange indicators
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* **channels** (`Optional`\[`List`\[[`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")]]) – A list of channel names to plot
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**Returns**
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A matplotlib figure object of the pulse schedule
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**Return type**
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matplotlib.figure
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</Function>
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### insert
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<Function id="qiskit.pulse.instructions.Delay.insert" signature="Delay.insert(start_time, schedule, name=None)">
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Return a new [`Schedule`](qiskit.pulse.Schedule "qiskit.pulse.Schedule") with `schedule` inserted within `self` at `start_time`.
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**Parameters**
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* **start\_time** (`int`) – Time to insert the schedule schedule
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* **schedule** (*Union\['Schedule', 'Instruction']*) – Schedule or instruction to insert
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* **name** (`Optional`\[`str`]) – Name of the new schedule. Defaults to name of self
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**Returns**
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A new schedule with `schedule` inserted with this instruction at t=0.
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**Return type**
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[Schedule](qiskit.pulse.Schedule "qiskit.pulse.Schedule")
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</Function>
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### is\_parameterized
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<Function id="qiskit.pulse.instructions.Delay.is_parameterized" signature="Delay.is_parameterized()">
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Return `True` iff the instruction is parameterized.
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**Return type**
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`bool`
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</Function>
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### shift
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<Function id="qiskit.pulse.instructions.Delay.shift" signature="Delay.shift(time, name=None)">
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Return a new schedule shifted forward by time.
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**Parameters**
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* **time** (`int`) – Time to shift by
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* **name** (`Optional`\[`str`]) – Name of the new schedule. Defaults to name of self
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**Returns**
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The shifted schedule.
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**Return type**
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[Schedule](qiskit.pulse.Schedule "qiskit.pulse.Schedule")
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</Function>
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## Attributes
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### channel
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<Attribute id="qiskit.pulse.instructions.Delay.channel">
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Return the [`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel") that this instruction is scheduled on.
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**Return type**
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[`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")
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</Attribute>
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### channels
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<Attribute id="qiskit.pulse.instructions.Delay.channels">
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Returns the channels that this schedule uses.
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**Return type**
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`Tuple`\[[`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")]
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</Attribute>
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### duration
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<Attribute id="qiskit.pulse.instructions.Delay.duration">
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Duration of this instruction.
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**Return type**
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`Union`\[`int`, `ParameterExpression`]
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</Attribute>
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### id
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<Attribute id="qiskit.pulse.instructions.Delay.id">
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Unique identifier for this instruction.
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**Return type**
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`int`
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</Attribute>
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### instructions
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<Attribute id="qiskit.pulse.instructions.Delay.instructions">
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Iterable for getting instructions from Schedule tree.
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**Return type**
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`Tuple`\[`Tuple`\[`int`, `Instruction`]]
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</Attribute>
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### name
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<Attribute id="qiskit.pulse.instructions.Delay.name">
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Name of this instruction.
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**Return type**
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`str`
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</Attribute>
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### operands
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<Attribute id="qiskit.pulse.instructions.Delay.operands">
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Return instruction operands.
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**Return type**
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`Tuple`
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</Attribute>
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### parameters
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<Attribute id="qiskit.pulse.instructions.Delay.parameters">
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Parameters which determine the instruction behavior.
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**Return type**
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`Set`
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</Attribute>
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### start\_time
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<Attribute id="qiskit.pulse.instructions.Delay.start_time">
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Relative begin time of this instruction.
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**Return type**
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`int`
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</Attribute>
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### stop\_time
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<Attribute id="qiskit.pulse.instructions.Delay.stop_time">
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Relative end time of this instruction.
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**Return type**
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`int`
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</Attribute>
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</Class>
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