Additional issues during pulse playback on HDAWG

[maxbeer99]

This issue is a collection of pulse corruption I noticed. According to @Nomos11 these might not actually be cause by qupulse.

Example 1

from qupulse.pulses import *

default_params = {}

for ii in range(4):
    default_params[f't_read_{ii}'] = qupulse_inst.awg1.make_properly_quantized_time(int(4.5e06))

default_params = {**default_params,
    'V_read_0': 0,
    'V_read_1': 0,
    'V_read_2': 0,
    'V_read_3': 0,

    'f': 100e-9,
    }

shuttle_period = qupulse_inst.awg1.make_properly_quantized_time((1/(default_params["f"]*1e09)) * 1e09)
actual_frequency = 1 / shuttle_period

read_pls = PointPT([
    ('t_read_0', 'V_read_0'),
    ('t_read_1', 'V_read_1'),
    ('t_read_2', 'V_read_2'),
    ('t_read_3', 'V_read_3'),
    ], ["playback_channel_D"])

shuttle_out = FunctionPT(f'.75 * cos(2*pi*{actual_frequency}*t + pi/2)', duration_expression=shuttle_period, channel='playback_channel_D')

shuttle_and_read = shuttle_out @ read_pls

pulse_template = read_pls @ qupulse.pulses.RepetitionPT(shuttle_and_read, 15) @ read_pls

physical_pulse_template = pulse_template
_ = qupulse.pulses.plotting.plot(physical_pulse_template, default_params, sample_rate=500*(1/shuttle_period))

_.set_figwidth(50)

// program definitions
void renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_function() {
  var pos = 0;

  waitForSoftwareTrigger();
  playWaveIndexed(renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_0,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_1,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_2,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_3, pos, 5744); pos = pos + 5744;
}

Sample rate: 24.41kHz (100M base)

The constant tail appears at random voltages from run to run.

Removing read_pls from both the start and end of pulse_template fixes it:

from qupulse.pulses import *

default_params = {}

for ii in range(4):
    default_params[f't_read_{ii}'] = qupulse_inst.awg1.make_properly_quantized_time(int(4.5e06))

default_params = {**default_params,
    'V_read_0': 0,
    'V_read_1': 0,
    'V_read_2': 0,
    'V_read_3': 0,

    'f': 100e-9,
    }

shuttle_period = qupulse_inst.awg1.make_properly_quantized_time((1/(default_params["f"]*1e09)) * 1e09)
actual_frequency = 1 / shuttle_period

read_pls = PointPT([
    ('t_read_0', 'V_read_0'),
    ('t_read_1', 'V_read_1'),
    ('t_read_2', 'V_read_2'),
    ('t_read_3', 'V_read_3'),
    ], ["playback_channel_D"])

shuttle_out = FunctionPT(f'.75 * cos(2*pi*{actual_frequency}*t + pi/2)', duration_expression=shuttle_period, channel='playback_channel_D')

shuttle_and_read = shuttle_out @ read_pls

pulse_template = qupulse.pulses.RepetitionPT(shuttle_and_read, 15)

physical_pulse_template = pulse_template
_ = qupulse.pulses.plotting.plot(physical_pulse_template, default_params, sample_rate=500*(1/shuttle_period))

_.set_figwidth(50)

This might be because it creates a repeat in seqc:

// program definitions
void renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_function() {
  var pos = 0;

  waitForSoftwareTrigger();
  repeat(15) {
    playWaveIndexed(renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_0,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_1,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_2,renamed__e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855_concatenated_waveform_3, pos, 368); // advance disabled do to parent repetition
  }
  pos = pos + 368;
}

[terrorfisch]

Does this still appear with #772 ?

[maxbeer99]

Unfortunately I only have a sample connected, but issues like in #770 should still be visible. Not sure whether the issues here and in #770 are of the same origin.

However the Issue still exists with #766

Before (branch https://github.com/maxbeer99/qupulse/tree/issues/751_hdawg_multiple_issues_during_elf_file_upload)

After (branch https://github.com/qutech/qupulse/tree/issues/751_selene_fixes)

It is clearly visible for both that the pulse halts at the end uncontrollably