I'm getting this warning:

C:\Users\XYZ\Anaconda3\lib\site-packages\qiskit\providers\models\backendconfiguration.py:337: UserWarning: `dt` and `dtm` now have units of seconds(s) rather than nanoseconds(ns).
  warnings.warn('`dt` and `dtm` now have units of seconds(s) rather ' 

Can you please help me understand this? Thanks.

  • $\begingroup$ Hi, please clarify what is your problem. $\endgroup$ Dec 30, 2019 at 19:03
  • $\begingroup$ Would it be possible to edit a minimal (not) working example of code into this, so that we have some context to go from? Thanks $\endgroup$
    – Mithrandir24601
    Jan 1, 2020 at 10:27

1 Answer 1


This is just a warning to let you know that the API has changed for the backend configurations such as PulseBackendConfiguration. The dt (qubit drive channel timestep) and dtm (measurement drive channel timestep) parameters were previously specified in nanoseconds, but they are now specified in seconds. If you're not doing anything so advanced as to directly use these parameters, you can safely ignore the warning.

  • $\begingroup$ Is there a way to suppress those warnings? $\endgroup$
    – FSeed
    Apr 16, 2020 at 17:36

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