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What is the best option for South America Brazil to configure: provider.get_backend (''), because melbourne_16 is very slow.

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The names of the chips are (sadly) not where they are actually located. I would recommend using least_busy to find the provider with the shortest queue so that you can have your results returned to you as fast as possible. This can be done as follows

provider = IBMQ.load_account()
device = least_busy(provider.backends(simulator=False))

There are many people using the devices, and so your jobs get placed in a queue, which is why it can take a while for results to come back

However, if you really don't want to wait, you can use a NoiseModel with the simulator to replicate real noise, as if you were to run your circuit on a real device. An example of how to do this can be seen here,

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    $\begingroup$ Thanks @ met 927 your answers helped me a lot. I'll test it, and send the results. Thank you $\endgroup$ – Givanildo Gramacho May 2 at 5:41

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