code: def thermal_state(nbar, hbar=2.0):
      r"""Returns a thermal state.
  
      Args:
          nbar (float): the mean photon number
          hbar (float): (default 2) the value of :math:`\hbar` in the commutation
              relation :math:`[\x,\p]=i\hbar`
  
      Returns:
          array: the thermal state
      """
      means = np.zeros([2])
      state = [(2 * nbar + 1) * np.identity(2) * hbar / 2, means]
      return state
  
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 17 for calling a global function with example usage: thermal_state(nbar, hbar) and returns: state