qiskit/quantum_info/operators/channel/stinespring.py
def multiply(self, other):
        """Return the QuantumChannel self + other.

        Args:
            other (complex): a complex number.

        Returns:
            Stinespring: the scalar multiplication other * self as a
            Stinespring object.

        Raises:
            QiskitError: if other is not a valid scalar.
        """
        if not isinstance(other, Number):
            raise QiskitError("other is not a number")
        # If the number is complex or negative we need to convert to
        # general Stinespring representation so we first convert to
        # the Choi representation
        if isinstance(other, complex) or other < 1:
            # Convert to Choi-matrix
            return Stinespring(Choi(self).multiply(other))
        # If the number is real we can update the Kraus operators
        # directly
        num = np.sqrt(other)
        stine_l, stine_r = self._data
        stine_l = num * self._data[0]
        stine_r = None
        if self._data[1] is not None:
            stine_r = num * self._data[1]
        return Stinespring((stine_l, stine_r), self.input_dims(),
                           self.output_dims())
def multiply(self, other):
        """Return the QuantumChannel self + other.

        Args:
            other (complex): a complex number.

        Returns:
            Stinespring: the scalar multiplication other * self as a
            Stinespring object.

        Raises:
            QiskitError: if other is not a valid scalar.
        """
        if not isinstance(other, Number):
            raise QiskitError("other is not a number")
        # If the number is complex or negative we need to convert to
        # general Stinespring representation so we first convert to
        # the Choi representation
        if isinstance(other, complex) or other < 1:
            # Convert to Choi-matrix
            return Stinespring(Choi(self).multiply(other))
        # If the number is real we can update the Kraus operators
        # directly
        num = np.sqrt(other)
        stine_l, stine_r = self._data
        stine_l = num * self._data[0]
        stine_r = None
        if self._data[1] is not None:
            stine_r = num * self._data[1]
        return Stinespring((stine_l, stine_r), self.input_dims(),
                           self.output_dims())
Return the QuantumChannel self + other.

        Args:
            other (complex): a complex number.

        Returns:
            Stinespring: the scalar multiplication other * self as a
            Stinespring object.

        Raises:
            QiskitError: if other is not a valid scalar.