qiskit/quantum_info/operators/channel/transformations.py
def _to_chi(rep, data, input_dim, output_dim):
    """Transform a QuantumChannel to the Chi representation."""
    if rep == 'Chi':
        return data
    # Check valid n-qubit input
    _check_nqubit_dim(input_dim, output_dim)
    if rep == 'Operator':
        return _from_operator('Chi', data, input_dim, output_dim)
    # Convert via Choi representation
    if rep != 'Choi':
        data = _to_choi(rep, data, input_dim, output_dim)
    return _choi_to_chi(data, input_dim, output_dim)
def _to_chi(rep, data, input_dim, output_dim):
    """Transform a QuantumChannel to the Chi representation."""
    if rep == 'Chi':
        return data
    # Check valid n-qubit input
    _check_nqubit_dim(input_dim, output_dim)
    if rep == 'Operator':
        return _from_operator('Chi', data, input_dim, output_dim)
    # Convert via Choi representation
    if rep != 'Choi':
        data = _to_choi(rep, data, input_dim, output_dim)
    return _choi_to_chi(data, input_dim, output_dim)
def _to_chi ( rep , data , input_dim , output_dim ) : if rep == 'Chi' : return data # Check valid n-qubit input _check_nqubit_dim ( input_dim , output_dim ) if rep == 'Operator' : return _from_operator ( 'Chi' , data , input_dim , output_dim ) # Convert via Choi representation if rep != 'Choi' : data = _to_choi ( rep , data , input_dim , output_dim ) return _choi_to_chi ( data , input_dim , output_dim )
Transform a QuantumChannel to the Chi representation.
Transform a QuantumChannel to the Chi representation .