pygsti.tools.optools.jtracedist

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pygsti.tools.optools.jtracedist#

jtracedist(a, b, mx_basis='pp')#

Compute the Jamiolkowski trace distance between operation matrices.

This is given by:

D = 0.5 * Tr( sqrt{ (J(a)-J(b))^2 } )

where J(.) is the Jamiolkowski isomorphism map that maps a operation matrix to it’s corresponding Choi Matrix.

Parameters:

  • a (numpy array) – First matrix.

  • b (numpy array) – Second matrix.

  • mx_basis ({'std', 'gm', 'pp', 'qt'} or Basis object) – The source and destination basis, respectively. Allowed values are Matrix-unit (std), Gell-Mann (gm), Pauli-product (pp), and Qutrit (qt) (or a custom basis object).

Return type:

float

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