264 lines
9.0 KiB
Plaintext
264 lines
9.0 KiB
Plaintext
---
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title: ShiftPhase
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description: API reference for qiskit.pulse.instructions.ShiftPhase
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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.ShiftPhase
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---
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# ShiftPhase
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<Class id="qiskit.pulse.instructions.ShiftPhase" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/pulse/instructions/phase.py" signature="ShiftPhase(phase, channel, name=None)" modifiers="class">
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Bases: [`Instruction`](pulse#qiskit.pulse.instructions.Instruction "qiskit.pulse.instructions.instruction.Instruction")
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The shift phase instruction updates the modulation phase of proceeding pulses played on the same [`Channel`](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel"). It is a relative increase in phase determined by the `phase` operand.
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In particular, a PulseChannel creates pulses of the form
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$$
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Re[\exp(i 2\pi f jdt + \phi) d_j].
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$$
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The `ShiftPhase` instruction causes $\phi$ to be increased by the instruction’s `phase` operand. This will affect all pulses following on the same channel.
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The qubit phase is tracked in software, enabling instantaneous, nearly error-free Z-rotations by using a ShiftPhase to update the frame tracking the qubit state.
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Instantiate a shift phase instruction, increasing the output signal phase on `channel` by `phase` \[radians].
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**Parameters**
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* **phase** (*complex |* [*ParameterExpression*](qiskit.circuit.ParameterExpression "qiskit.circuit.parameterexpression.ParameterExpression")) – The rotation angle in radians.
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* **channel** (*PulseChannel*) – The channel this instruction operates on.
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* **name** (*str | None*) – Display name for this instruction.
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## Methods
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<span id="qiskit-pulse-instructions-shiftphase-append" />
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### append
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<Function id="qiskit.pulse.instructions.ShiftPhase.append" signature="ShiftPhase.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** (*str | None*) – 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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<span id="qiskit-pulse-instructions-shiftphase-ch-duration" />
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### ch\_duration
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<Function id="qiskit.pulse.instructions.ShiftPhase.ch_duration" signature="ShiftPhase.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** (*List\[*[*Channel*](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")*]*) – Supplied channels
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**Return type**
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int
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</Function>
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<span id="qiskit-pulse-instructions-shiftphase-ch-start-time" />
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### ch\_start\_time
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<Function id="qiskit.pulse.instructions.ShiftPhase.ch_start_time" signature="ShiftPhase.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** (*List\[*[*Channel*](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")*]*) – Supplied channels
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**Return type**
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int
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</Function>
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<span id="qiskit-pulse-instructions-shiftphase-ch-stop-time" />
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### ch\_stop\_time
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<Function id="qiskit.pulse.instructions.ShiftPhase.ch_stop_time" signature="ShiftPhase.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** (*List\[*[*Channel*](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")*]*) – Supplied channels
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**Return type**
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int
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</Function>
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<span id="qiskit-pulse-instructions-shiftphase-draw" />
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### draw
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<Function id="qiskit.pulse.instructions.ShiftPhase.draw" signature="ShiftPhase.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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<Admonition title="Deprecated since version 0.23.0" type="danger">
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The method `qiskit.pulse.instructions.instruction.Instruction.draw()` is deprecated as of qiskit-terra 0.23.0. It will be removed no earlier than 3 months after the release date. No direct alternative is being provided to drawing individual pulses. But, instructions can be visualized as part of a complete schedule using `qiskit.visualization.pulse_drawer`.
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</Admonition>
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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** (*str | None*) – Name required to save pulse image
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* **interp\_method** (*Callable | None*) – 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** (*Tuple\[float] | None*) – 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** (*List\[*[*Channel*](pulse#qiskit.pulse.channels.Channel "qiskit.pulse.channels.Channel")*] | None*) – 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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<span id="qiskit-pulse-instructions-shiftphase-insert" />
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### insert
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<Function id="qiskit.pulse.instructions.ShiftPhase.insert" signature="ShiftPhase.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** (*str | None*) – 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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<span id="qiskit-pulse-instructions-shiftphase-is-parameterized" />
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### is\_parameterized
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<Function id="qiskit.pulse.instructions.ShiftPhase.is_parameterized" signature="ShiftPhase.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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<span id="qiskit-pulse-instructions-shiftphase-shift" />
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### shift
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<Function id="qiskit.pulse.instructions.ShiftPhase.shift" signature="ShiftPhase.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** (*str | None*) – 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.ShiftPhase.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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</Attribute>
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### channels
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.channels">
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Returns the channels that this schedule uses.
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</Attribute>
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### duration
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.duration">
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Duration of this instruction.
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</Attribute>
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### id
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.id">
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Unique identifier for this instruction.
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</Attribute>
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### instructions
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.instructions">
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Iterable for getting instructions from Schedule tree.
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</Attribute>
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### name
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.name">
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Name of this instruction.
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</Attribute>
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### operands
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.operands">
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Return instruction operands.
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</Attribute>
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### parameters
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.parameters">
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Parameters which determine the instruction behavior.
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</Attribute>
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### phase
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.phase">
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Return the rotation angle enacted by this instruction in radians.
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</Attribute>
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### start\_time
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.start_time">
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Relative begin time of this instruction.
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</Attribute>
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### stop\_time
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<Attribute id="qiskit.pulse.instructions.ShiftPhase.stop_time">
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Relative end time of this instruction.
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</Attribute>
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</Class>
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