A new Australian defence pact elevates Papua New Guinea to the treaty level of the United States and New Zealand, Anthony Albanese says.

The prime minister is visiting Port Moresby this week to sign the pact with counterpart James Marape and attend PNG's celebrations for its 50th anniversary of independence.

The landmark agreement will "integrate" forces either side of the Torres Strait and could trigger mutual support in cases of conflict.

It will also enable PNG nationals to serve in Australia's defence force with the same pay as other members and start a pathway to citizenship.

"It's an upgrade in our security relationship to a treaty level, to the sort of level that we have with the United States and our important allies," the prime minister told the ABC on Monday.

Details are yet

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