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I can't find much resources about how Qiskit API libraries are organised. We could see versions by using:

import qiskit 
print(qiskit.__qiskit_version__)
>> {'qiskit-terra': '0.21.2',
 'qiskit-aer': '0.10.4',
 'qiskit-ignis': None,
 'qiskit-ibmq-provider': '0.19.2',
 'qiskit': '0.37.2',
 'qiskit-nature': None,
 'qiskit-finance': None,
 'qiskit-optimization': None,
 'qiskit-machine-learning': None}

What is the purpose of these libraries?

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    $\begingroup$ This blogpost from Qiskit's official blog contains a good overview: medium.com/qiskit/… $\endgroup$
    – Egretta.Thula
    Sep 21, 2022 at 5:17
  • $\begingroup$ If the images are public licensed, please consider converting comment to answer. @Egretta.Thula $\endgroup$
    – Rajesh Swarnkar
    Sep 21, 2022 at 5:48
  • $\begingroup$ @luciano Yes nicely ! $\endgroup$
    – Rajesh Swarnkar
    Sep 21, 2022 at 7:14

1 Answer 1

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-terra is the "core" of qiskit, containing things like the circuit class, gates, etc. -aer contains circuit simulators to test out your circuit. -ignis is for noise modeling, containing various error channels and quantum information and error correction utilities. -ibmq-provider is for running on the IBM cloud, be it QPUs or hosted simulators. Note: -ignis has been superseded by qiskit-experiments, as in @Egretta.Thula'a comment.

qiskit itself just packages everything together. -nature, -finance, -optimization, and -machine-learning are pretty self explanatory, containing tools to express problems in their respective domains as quantum programs.

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