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random_quantum_channel(input_dims=None, output_dims=None, rank=None, seed=None)

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Return a random CPTP quantum channel.

This constructs the Stinespring operator for the quantum channel by sampling a random isometry from the unitary Haar measure.


  • input_dims (int or tuple) – the input dimension of the channel.
  • output_dims (int or tuple) – the input dimension of the channel.
  • rank (int) – Optional. The rank of the quantum channel Choi-matrix.
  • seed (int or np.random.Generator) – Optional. Set a fixed seed or generator for RNG.


a quantum channel operator.

Return type



QiskitError – if rank or dimensions are invalid.

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