We don't have synonyms for quantises yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are quantiser, quantise and quantizes.
(v) :
(British spelling) Alternative spelling of quantize. [(transitive, physics) To limit the number of possible values of a quantity, or states of a system, by applying the rules of quantum mechanics]
(v) :
(British spelling) Alternative spelling of quantize. [(transitive, physics) To limit the number of possible values of a quantity, or states of a system, by applying the rules of quantum mechanics]