code: def homodyne(phi=None):
      """Function factory that returns the Homodyne expectation of a one mode state.
  
      Args:
          phi (float): the default phase space axis to perform the Homodyne measurement
  
      Returns:
          function: A function that accepts a single mode means vector, covariance matrix,
          and phase space angle phi, and returns the quadrature expectation
          value and variance.
      """
      if phi is not None:
  
          def _homodyne(cov, mu, params, hbar=2.0):
              """Arbitrary angle homodyne expectation."""
              # pylint: disable=unused-argument
              rot = rotation(phi)
              muphi = rot.T @ mu
              covphi = rot.T @ cov @ rot
              return muphi[0], covphi[0, 0]
  
          return _homodyne
  
      def _homodyne(cov, mu, params, hbar=2.0):
          """Arbitrary angle homodyne expectation."""
          # pylint: disable=unused-argument
          rot = rotation(params[0])
          muphi = rot.T @ mu
          covphi = rot.T @ cov @ rot
          return muphi[0], covphi[0, 0]
  
      return _homodyne
  
imports: import math
  import cmath
  import numpy
  from scipy.special import factorial
  import pennylane
  from pennylane.ops import Identity
  from pennylane import Device
  from .._version import __version__
label_desc: Use image node_id 21 for calling a global function with example usage: homodyne(phi) and returns: _homodyne, _homodyne, muphi,  covphi, muphi,  covphi