pygsti.tools.errgenproptools.phi

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pygsti.tools.errgenproptools.phi#

phi(tableau, desired_bitstring, P, Q)#

This function computes a quantity whose value is used in expression for the sensitivity of probabilities to error generators.

Parameters:

  • tableau (stim.Tableau or stim.TableauSimulator) – A stim Tableau or stim TableauSimulator corresponding to the input stabilizer state. If a stim.TableauSimulator it is assumed that this simulator has already had the appropriate inverse tableau value instantiated.

  • desired_bitstring (str) – A string of zeros and ones corresponding to the bit string being measured.

  • P (str or stim.PauliString) – The first pauli string index.

  • Q (str or stim.PauliString) – The second pauli string index.

Return type:

A complex number corresponding to the value of the phi function.

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