High School What is the Worldline of a Quantum Particle Before and After State Reduction?

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The discussion centers on the concept of a quantum particle's worldline in the context of General Relativity (GR) before and after state reduction. It highlights the incompatibility of GR, a classical theory, with the behavior of quantum particles, which do not possess well-defined worldlines. The double-slit experiment is cited as evidence that quantum particles can traverse multiple paths simultaneously, contradicting the notion of a single worldline. Participants agree that the original question is poorly framed and lacks a definitive answer. Ultimately, the consensus is that quantum mechanics and GR operate under fundamentally different principles.
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In GR. What's the worldline of a quantum particle before and after it undergoes state reduction (before and after Born rule applied)?
 
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GR is a classical theory. I'm not sure there's a good answer to your question, and I'm rather doubtful that a quantum particle can be represented as having a worldline at all. Consider the double-slit experiment, for example. A worldline would go through only one slit, the quantum particle goes through both.
 
Pervect is correct, GR is a classical theory, not a quantum theory, and quantum particles do not have worldlines. That means the OP question is not well posed and cannot be answered.

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In an inertial frame of reference (IFR), there are two fixed points, A and B, which share an entangled state $$ \frac{1}{\sqrt{2}}(|0>_A|1>_B+|1>_A|0>_B) $$ At point A, a measurement is made. The state then collapses to $$ |a>_A|b>_B, \{a,b\}=\{0,1\} $$ We assume that A has the state ##|a>_A## and B has ##|b>_B## simultaneously, i.e., when their synchronized clocks both read time T However, in other inertial frames, due to the relativity of simultaneity, the moment when B has ##|b>_B##...
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