TimeBlockade

class qiskit.pulse.instructions.TimeBlockade(duration, channel, name=None)

Bases: Directive

Pulse TimeBlockade directive.

This instruction is intended to be used internally within the pulse builder, to convert Schedule into ScheduleBlock. Because ScheduleBlock cannot take an absolute instruction time interval, this directive helps the block representation to find the starting time of an instruction.

Example

This schedule plays constant pulse at t0 = 120.

schedule = Schedule()
schedule.insert(120, Play(Constant(10, 0.1), DriveChannel(0)))

This schedule block is expected to be identical to above at a time of execution.

block = ScheduleBlock()
block.append(TimeBlockade(120, DriveChannel(0)))
block.append(Play(Constant(10, 0.1), DriveChannel(0)))

Such conversion may be done by

from qiskit.pulse.transforms import block_to_schedule, remove_directives
 
schedule = remove_directives(block_to_schedule(block))

Note

The TimeBlockade instruction behaves almost identically to Delay instruction. However, the TimeBlockade is just a compiler directive and must be removed before execution. This may be done by remove_directives() transform. Once these directives are removed, occupied timeslots are released and user can insert another instruction without timing overlap.

Create a time blockade directive.

Parameters

duration (int) – Length of time of the occupation in terms of dt.
channel (Channel) – The channel that will be the occupied.
name (str | None) – Name of the time blockade for display purposes.

Attributes

channel

Return the 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)

Return a new 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 | 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

ch_duration

ch_duration(*channels)

Return duration of the supplied channels in this Instruction.

Parameters

*channels (List[Channel]) – Supplied channels

Return type

int

ch_start_time

ch_start_time(*channels)

Return minimum start time for supplied channels.

Parameters

*channels (List[Channel]) – Supplied channels

Return type

int

ch_stop_time

ch_stop_time(*channels)

Return maximum start time for supplied channels.

Parameters

*channels (List[Channel]) – Supplied channels

Return type

int

draw

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)

Plot the instruction.

Deprecated since version 0.23.0

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.

Parameters

dt (float) – Time interval of samples
style (Optional[SchedStyle]) – A style sheet to configure plot appearance
filename (str | None) – Name required to save pulse image
interp_method (Callable | None) – A function for interpolation
scale (float) – Relative visual scaling of waveform amplitudes
plot_all (bool) – Plot empty channels
plot_range (Tuple[float] | None) – A tuple of time range to plot
interactive (bool) – When set true show the circuit in a new window (this depends on the matplotlib backend being used supporting this)
table (bool) – Draw event table for supported instructions
label (bool) – Label individual instructions
framechange (bool) – Add framechange indicators
channels (List[Channel] | None) – A list of channel names to plot

Returns

A matplotlib figure object of the pulse schedule

Return type

matplotlib.figure

insert

insert(start_time, schedule, name=None)

Return a new Schedule with schedule inserted within self at start_time.

Parameters

start_time (int) – Time to insert the schedule schedule
schedule (Union['Schedule', 'Instruction']) – Schedule or instruction to insert
name (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