Theoretical Quantum Entanglement Question

Theheretic
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If Quantum Entanglement is real and observable, then what is stopping us from making the following observation: provided that the big bang was real and did occur, and provided that the initial occurrence of the big bang was from a single "particle" or entity, what is stopping us from concluding that every particle in existence in the current universe is thus quantum-ly entangled in some way since they were all hypothetically generated not only from the same event (big bang) but perhaps even from the same original "particle" or entity.
 
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Your question remind me the many world interpretation. You can think that the our whole university is a 'big' quantum state and evolve over time. You may believe it, but this statement is not an observable under today's physical understanding cos we have only one universe. In order to make have conclusion of quantum measurement, we have to prepare many ensemble of same system. But we only have one universe.
 
And nothing proves that the universe comes from one entity. There is even no reason to think so.

At the time of Plank, the universe was like it is now. The energy density was just higher.
Before that, we don't know. As John Wheeler used to say, such a density would destroy space-time as we know it. Therefore we can't state that before this instant, the density was higher, lower, or even defined.
 
Theheretic said:
... what is stopping us from concluding that every particle in existence in the current universe is thus quantum-ly entangled in some way since they were all hypothetically generated not only from the same event (big bang) but perhaps even from the same original "particle" or entity.

Maybe in a sense they are.

Would that conclusion have anything to do with the kind of quantum entanglement that observed daily? Because that certainly is real.
 
I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
I am not sure if this belongs in the biology section, but it appears more of a quantum physics question. Mike Wiest, Associate Professor of Neuroscience at Wellesley College in the US. In 2024 he published the results of an experiment on anaesthesia which purported to point to a role of quantum processes in consciousness; here is a popular exposition: https://neurosciencenews.com/quantum-process-consciousness-27624/ As my expertise in neuroscience doesn't reach up to an ant's ear...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
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