qiskit.pulse.instructions.ShiftPhase

class ShiftPhase(phase, channel, name=None)

The shift phase instruction updates the modulation phase of proceeding pulses played on the same Channel. It is a relative increase in phase determined by the phase operand.

In particular, a PulseChannel creates pulses of the form

\[Re[\exp(i 2\pi f jdt + \phi) d_j].\]

The ShiftPhase instruction causes \(\phi\) to be increased by the instruction’s phase operand. This will affect all pulses following on the same channel.

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.

Instantiate a shift phase instruction, increasing the output signal phase on channel by phase [radians].

Parameters

• phase (Union[complex, ParameterExpression]) – The rotation angle in radians.

• channel (PulseChannel) – The channel this instruction operates on.

• name (Optional[str]) – Display name for this instruction.

__init__(phase, channel, name=None)

Instantiate a shift phase instruction, increasing the output signal phase on channel by phase [radians].

Parameters

• phase (Union[complex, ParameterExpression]) – The rotation angle in radians.

• channel (PulseChannel) – The channel this instruction operates on.

• name (Optional[str]) – Display name for this instruction.

Methods

__init__(phase, channel[, name])	Instantiate a shift phase instruction, increasing the output signal phase on channel by phase [radians].
append(schedule[, name])	Return a new Schedule with schedule inserted at the maximum time over all channels shared between self and schedule.
assign_parameters(value_dict)	Modify and return self with parameters assigned according to the input.
ch_duration(*channels)	Return duration of the supplied channels in this Instruction.
ch_start_time(*channels)	Return minimum start time for supplied channels.
ch_stop_time(*channels)	Return maximum start time for supplied channels.
draw([dt, style, filename, interp_method, …])	Plot the instruction.
flatten()	Return itself as already single instruction.
insert(start_time, schedule[, name])	Return a new Schedule with schedule inserted within self at start_time.
shift(time[, name])	Return a new schedule shifted forward by time.

Attributes

channel	Return the Channel that this instruction is scheduled on.
channels	Returns channels that this schedule uses.
command	The associated command.
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.
phase	Return the rotation angle enacted by this instruction in radians.
start_time	Relative begin time of this instruction.
stop_time	Relative end time of this instruction.
timeslots	Occupied time slots by this instruction.

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 (ScheduleComponent) – schedule to be appended

• name (Optional[str]) – Name of the new schedule. Defaults to name of self

Return type

Schedule

assign_parameters(value_dict)

Modify and return self with parameters assigned according to the input.

Parameters

value_dict (Dict[ParameterExpression, Union[ParameterExpression, float, int]]) – A mapping from Parameters to either numeric values or another Parameter expression.

Return type

Instruction

Returns

Self with updated parameters.

ch_duration(*channels)

Return duration of the supplied channels in this Instruction.

Parameters

*channels – Supplied channels

Return type

int

ch_start_time(*channels)

Return minimum start time for supplied channels.

Parameters

*channels – Supplied channels

Return type

int

ch_stop_time(*channels)

Return maximum start time for supplied channels.

Parameters

*channels – Supplied channels

Return type

int

property channel

Return the Channel that this instruction is scheduled on.

Return type

PulseChannel

property channels

Returns channels that this schedule uses.

Return type

Tuple[Channel]

property command

The associated command. Commands are deprecated, so this method will be deprecated shortly.

Returns

The deprecated command if available.

Return type

Command

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.

Parameters

• dt (float) – Time interval of samples

• style (Optional[SchedStyle]) – A style sheet to configure plot appearance

• filename (Optional[str]) – Name required to save pulse image

• interp_method (Optional[Callable]) – A function for interpolation

• scale (float) – Relative visual scaling of waveform amplitudes

• plot_all (bool) – Plot empty channels

• plot_range (Optional[Tuple[float]]) – 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 (Optional[List[Channel]]) – A list of channel names to plot

Returns

A matplotlib figure object of the pulse schedule

Return type

matplotlib.figure

property duration

Duration of this instruction.

Return type

int

flatten()

Return itself as already single instruction.

Return type

Instruction

property id

Unique identifier for this instruction.

Return type

int

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 (ScheduleComponent) – Schedule to insert

• name (Optional[str]) – Name of the new schedule. Defaults to name of self

Return type

Schedule

property instructions

Iterable for getting instructions from Schedule tree.

Return type

Tuple[Tuple[int, Instruction]]

property name

Name of this instruction.

Return type

str

property operands

Return instruction operands.

Return type

Tuple

property phase

Return the rotation angle enacted by this instruction in radians.

Return type

Union[complex, ParameterExpression]

shift(time, name=None)

Return a new schedule shifted forward by time.

Parameters

• time (int) – Time to shift by

• name (Optional[str]) – Name of the new schedule. Defaults to name of self

Return type

Schedule

property start_time

Relative begin time of this instruction.

Return type

int

property stop_time

Relative end time of this instruction.

Return type

int

property timeslots

Occupied time slots by this instruction.

Return type

Dict[Channel, List[Tuple[int, int]]]