stoquastic

Adjective

 * 1)  Of a Hermitian matrix, having real non-positive off-diagonal elements. These matrices have elements of  and classical theory of . For non-technical purposes ‘stoquastic’ is equivalent to “avoiding the ”.
 * 2) * 2015, Ian Kivlichan, “On the complexity of stoquastic Hamiltonians,” publication not named (termpaper?), 11 December 2015
 * Stoquastic Hamiltonians, those for which all off-diagonal matrix elements in the standard basis are real and non-positive, are common in the physical world.