Gate markers on shared channels

[JaseungKu]

I found that two-qubit RB sequence created by QGL is not right. Shown below is the 4 Clifford gates for two qubit RB, measured with our oscilloscope. The pulse sequence plot in the jupyter notebook looks the same as in the oscilloscrope, so I thought this would be a QGL issue.

The problem is that the qubit pulse train appears to go out of sync with the gate pulses so a gap appears between the ends of gate and qubit pulse train.

Can you see if this is reproducible in your QGL and if yes, would you fix it?

[dieris]

@jaseung please try #163

[dieris]

I actually can't reproduce this issue anymore after the fix above. Can you try to set all delays to 0 and see where your markers go out of sync? Is it at a specific point in the sequence, or is it cumulative?

[JaseungKu]

Hmm, it's the same. I set all delays to 0 and still see the same problems (gate and qubit out of sync). I even tried with markers disabled, but no luck. To see if there is any difference, I also tried to use QGL-last-matlab release, but the result is the same. Which QGL version did you use to test the fix? Any suggestion?

Just in case you're interested, I attached the ChannelParams.json below.

*ChannelParams.zip
ChannelParams.zip

*Screencapture of pulse trains in jupyter-notebook.

[dieris]

I'm only testing on the master branch. Unfortunately we do not support the matlab-compatible version anymore. It seems that your settings are alright, though. What happens when you disable the gatechan for both q2 and CR12?

[JaseungKu]

With gate channels for q2 and CR12, there's still the same issue. Well, I guess I should try the master branch. Can you provide a measure.yml for me to use in QGL to create two-qubit RB? Jaseung

…

On Mon, Apr 30, 2018 at 2:48 PM, Diego Ristè ***@***.***> wrote: I'm only testing on the master branch. Unfortunately we do not support the matlab-compatible version anymore. It seems that your settings are alright, though. What happens when you disable the gatechan for both q2 and CR12? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#162 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AVhJSwbqlSIHg4vRPxWdtbEgJR2uISzgks5tt1x0gaJpZM4TkCVF> .

[JaseungKu]

Sorry, I meant ' With gate channels for q2 and CR12 disabled'. Jaseung

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On Mon, Apr 30, 2018 at 5:08 PM, Jaseung Ku ***@***.***> wrote: With gate channels for q2 and CR12, there's still the same issue. Well, I guess I should try the master branch. Can you provide a measure.yml for me to use in QGL to create two-qubit RB? Jaseung On Mon, Apr 30, 2018 at 2:48 PM, Diego Ristè ***@***.***> wrote: > I'm only testing on the master branch. Unfortunately we do not support > the matlab-compatible version anymore. It seems that your settings are > alright, though. What happens when you disable the gatechan for both q2 > and CR12? > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub > <#162 (comment)>, or mute > the thread > <https://github.com/notifications/unsubscribe-auth/AVhJSwbqlSIHg4vRPxWdtbEgJR2uISzgks5tt1x0gaJpZM4TkCVF> > . >

[dieris]

Sent by email

[dieris]

Remaining issue, reported by @jaseung : control qubit gate (marker) stays high when combined with a gate on the CR pulse in the same channel