... unless we can directly influence the 'partner' photon?
Not in any real science today. It makes for good science fiction, of course.
When you measure one of an entangled pair it will randomly assume one state (say up or down if you are measuring spin), and there is no way to control what state it collapses too. What you do know is that the other one in the pair will be the opposite state.
Thats where the spooky action at a distance comes in. Measure "a" and "b" will always assume the opposite state. But, there is no way to control what state "a" collapses to.
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