The founders of quantum computing start-up PsiQuantum are hopeful of winning over sceptical federal and Queensland Coalition politicians by spruiking the support it has received from both Democrats and Republicans in the US, where it has won multimillion-dollar defence contracts.

However, opposition science spokesman Paul Fletcher remains unconvinced, telling The Australian Financial Review he still needs more details of the commercial agreement behind the $940 million investment, which the company and government have refused to disclose.