The idea that two quanta could be instantaneously entangled with one another, even across large distances, is often talked about as the spookiest part of quantum physics. If reality were fundamentally deterministic and were governed by hidden variables, this spookiness could be removed. Unfortunately, attempts to do away with this type of quantum weirdness have all failed, with conjectures like the AdS/CFT correspondence, which could involve an underlying objective reality, all requiring something exotic and unproven, such as the invocation of extra dimensions. (Credit: Alan Stonebraker/American Physical Society)
We think of physical reality as what objectively exists, independent of any observer. But relativity and quantum physics say otherwise.
If there’s one thing most of us can be certain of it’s this: that our observed, physical reality actually exists. Although there are always some philosophical assumptions…
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