The length of integration weight needs to be a multiple of 4

[xueyue-sherry-zhang]

Hello,

When I tried to use ConstantIntegrationWeights (

py-qua-tools/qualang_tools/config/components.py

Line 210 in cdc3541

class ConstantWaveform(Waveform):

) in the config builder and run the simulation, for example,

ro.add( Operation( MeasurePulse( "zero_pulse", [ zero_wf, zero_wf, ], 200, ) .add(DigitalWaveform("ON", [(1,0)])) .add(ConstantIntegrationWeights("integW_cos", 1.0, 0.0, int(1000 / 4))) .add(ConstantIntegrationWeights("integW_sin", 0.0, 1.0, int(1000 / 4))) .add(ConstantIntegrationWeights("integW_minus_sin", 0.0, -1.0, int(1000 / 4))), name='zero' )

I would get the error that

2022-08-04 09:34:29,863 - qm - ERROR - Invalidation ERROR integration [email protected]_minus_sin: Integration weight segment must have a length that is a multiple of 4

I was wondering whether there's a bug or what's the correct way of using it.

Thanks,
Sherry

[tomerfqm]

Hi @xueyue-sherry-zhang!
The ConstantIntegrationWeights class generates integration weights in the form of a list containing a single tuple of the value and duration.
This format of integration weights requires the duration to be in units of ns and a multiple of 4. In your example, the input duration is 250, which is not a multiple of 4, so you see this error in the config validation.

The correct way for your example would be to use the duration of the measurement pulse - 200. Of course, in the general case, the integration weights don't have to match the length of the pulse (in the case of smearing, for example), but nonetheless, they should be a multiple of 4 length. :)