Qiskit Aakash is a density matrix based software simulator developed by Indian Institute of Science (IISc), Bengaluru. The links provided in this page aims to explain how to use the new simulator (‘dm_simulator’) that has been added to existing qiskit backends. Those links provide information only about the new backend. Tutorial related to other backends or Qiskit in general can be found here.
What is dm_simulator?
dm_simulator is a backend which can be called to execute circuits provided by the user. This backend uses density matrix formalism to calculate the subsequent changes in the qubit state as gates are applied. Density matrix formalism allows one to incorporate environmental noises in a convenient way. A few types of known noise model are implemented and can be invoked while calculation.
Learn more about the dm_simulator from the official GitHub page.