stitched_pulse

Module containing definitions related to stitched pulses.

Module Contents

Classes

StitchedPulse	A pulse composed of multiple operations that together constitute a waveform.
_VoltageOffsetInfo
StitchedPulseBuilder	Incrementally construct a StitchedPulse using pulse and offset operations.

Functions

convert_to_numerical_pulse(...)

Convert an operation with pulses and voltage offsets to a NumericalPulse.

class StitchedPulse(name: str | None = None, pulse_info: list[Any] | None = None)

Bases: quantify_scheduler.operations.operation.Operation

A pulse composed of multiple operations that together constitute a waveform.

This class can be used to construct arbitrarily long waveforms by stitching together pulses with optional changes in offset in between.

Parameters:

• name (str or None, optional) – An optional name for the pulse.

• pulse_info (list[Any] or None, optional) – A list containing the pulses that are part of the StitchedPulse. By default None.

add_pulse(pulse_operation: quantify_scheduler.operations.operation.Operation) → None

Adds pulse_info of pulse_operation Operation to this Operation.

Parameters:

pulse_operation (Operation) – an operation containing pulse_info.

Raises:

ValueError – When the operation’s port and/or clock do not match those of the previously added SitchedPulse components.

_pulse_and_clock_match(operation_info: list[dict[str, Any]]) → bool

Check operation’s port and clock match with StitchedPulse or if it’s empty.

convert_to_numerical_pulse(operation: quantify_scheduler.operations.operation.Operation, scheduled_at: float = 0.0, sampling_rate: float = 1000000000.0) → quantify_scheduler.operations.operation.Operation

Convert an operation with pulses and voltage offsets to a NumericalPulse.

If the operation also contains gate_info and/or acquisition_info, the original operation type is returned with only the pulse_info replaced by that of a NumericalPulse.

The StitchedPulse, and possibly other pulses, can contain descriptions for DC voltage offsets in the pulse info list. Not all functionality in quantify_scheduler supports such operations. For the cases where DC offset operations are not supported, this function can be used to convert the operation to a NumericalPulse.

Parameters:

• operation (Operation) – The operation to be converted.

• scheduled_at (float, optional) – The scheduled play time of the operation. The resulting NumericalPulse can be sampled from this time until the end of its duration. By default 0.0.

• sampling_rate (float, optional) – The rate with which to sample the input operation. By default 1e9 (1 GHz).

Returns:

converted_operation – The converted operation containing the sampled pulse information of the input operation. If the original operation only contained pulse_info and no gate_info or acquisition_info, a NumericalPulse is returned. Otherwise, the input type is returned with the pulse_info replaced by that of a NumericalPulse.

Return type:

Operation

class _VoltageOffsetInfo

path_I: float

path_Q: float

t0: float

duration: float | None = None

reference_magnitude: quantify_scheduler.operations.pulse_library.ReferenceMagnitude | None = None

class StitchedPulseBuilder(name: str | None = None, port: str | None = None, clock: str | None = None, t0: float = 0.0)

Incrementally construct a StitchedPulse using pulse and offset operations.

Parameters:

• port (str or None, optional) – Port of the stitched pulse. This can also be added later through set_port(). By default None.

• clock (str or None, optional) – Clock used to modulate the stitched pulse. This can also be added later through set_clock(). By default None.

• t0 (float, optional) – Time in seconds when to start the pulses relative to the start time of the Operation in the Schedule. This can also be added later through set_t0(). By default None.

_name = 'StitchedPulse'

_port = None

_clock = None

_t0 = 0.0

_pulses: list[quantify_scheduler.operations.operation.Operation] = []

_offsets: list[_VoltageOffsetInfo] = []

set_port(port: str) → StitchedPulseBuilder

Set the port for all parts of the StitchedPulse.

Parameters:

port (str) – Port of the stitched pulse.

Return type:

StitchedPulseBuilder

set_clock(clock: str) → StitchedPulseBuilder

Set the clock for all parts of the StitchedPulse.

Parameters:

clock (str) – Clock used to modulate the stitched pulse.

Return type:

StitchedPulseBuilder

set_t0(t0: float) → StitchedPulseBuilder

Set the start time of the whole StitchedPulse.

Parameters:

t0 (float) – Time in seconds when to start the pulses relative to the start time of the Operation in the Schedule.

Return type:

StitchedPulseBuilder

add_pulse(pulse: quantify_scheduler.operations.operation.Operation, append: bool = True) → StitchedPulseBuilder

Add an Operation to the StitchedPulse that is a valid pulse.

Parameters:

• pulse (Operation) – The Operation to add.

• append (bool, optional) – Specifies whether to append the operation to the end of the StitchedPulse, or to insert it at a time relative to the start of the StitchedPulse, specified by the pulse’s t0 attribute. By default True.

Return type:

StitchedPulseBuilder

Raises:

RuntimeError – If the Operation is not a pulse.

add_voltage_offset(path_I: float, path_Q: float, duration: float | None = None, rel_time: float = 0.0, append: bool = True, min_duration: float = constants.MIN_TIME_BETWEEN_OPERATIONS * 1e-09, reference_magnitude: quantify_scheduler.operations.pulse_library.ReferenceMagnitude | None = None) → StitchedPulseBuilder

Add a DC voltage offset to the StitchedPulse.

Note

If the voltage offset is not zero at the end of the StitchedPulse, the StitchedPulseBuilder will automatically add a zero voltage offset operation at the end. In that case, the StitchedPulse operation cannot be used at the very end of a Schedule or a control-flow block. For more information, please see Voltage offsets.

Parameters:

• path_I (float) – The offset on path I of the sequencer.

• path_Q (float) – The offset on path Q of the sequencer.

• duration (float or None, optional) – Specifies how long to maintain the offset. The StitchedPulseBuilder will add a zero voltage offset operation after the specified duration. If set to None, the offset voltage offset will hold until the end of the StitchedPulse. By default None.

• rel_time (float, optional) – Specifies when to set the offset, relative to the current end of the StitchedPulse (if append = True), or to the start of the StitchedPulse (if append = False). By default 0.0.

• append (bool, optional) – Specifies whether to append the operation to the end of the StitchedPulse, or to insert it at a time relative to the start of the StitchedPulse, specified by the the rel_time argument. By default True.

• min_duration (float, optional) – The minimal duration of the voltage offset. By default equal to the grid time of Qblox modules.

• reference_magnitude (optional) – Scaling value and unit for the unitless amplitude. Uses settings in hardware config if not provided.

Return type:

StitchedPulseBuilder

Raises:

• ValueError – If the duration is specified and not at least min_duration.

• RuntimeError – If the offset overlaps in time with a previously added offset.

property operation_end: float

Determine the end time of an operation based on its pulses and offsets.

For pulses, the end time is calculated as the start time (t0) plus the pulse duration. For offsets, it uses the start time (t0) and, if provided, adds the duration. If no duration is specified for an offset, it assumes a default value of 0.0.

Returns:

The maximum end time considering all pulses and offsets.

_distribute_port_clock() → None

_distribute_t0(offsets: list[quantify_scheduler.operations.pulse_library.VoltageOffset]) → None

_build_voltage_offset_operations() → list[quantify_scheduler.operations.pulse_library.VoltageOffset]

Add offset instructions that reset any offset that had a specified duration.

If an offset was added without a duration, it is assumed that its duration should be until the end of the StitchedPulse, and any following offsets that _do_ have a duration will be reset to this value. Otherwise, offsets with a duration will be reset to 0.

At the end of the StitchedPulse, the offset will be reset to 0.

An offset does not need to be reset, if at the end of its duration, another offset instruction starts.

This method requires the port and clock to have been set.

_overlaps_with_existing_offsets(offset: _VoltageOffsetInfo) → bool

build() → StitchedPulse

Build the StitchedPulse.

Return type:

StitchedPulse