I What is the physical meaning of concurence (quantum information)?

Arquimedes
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Hello, I am currently studying about entanglement on spin-1/2 chains and I was able to find some information about the mathematical point of view of concurrence but I can't understand the physical meaning of it . Can somebody help me, please?
 
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Concurrence is a measure of entanglement between two qubits, or two spin-1/2 particles. It measures the degree of correlation between the two particles and is defined using the density matrix of the two-qubit system. When two qubits are in a maximally entangled state, the concurrence is 1, and when there is no entanglement between them, the concurrence is 0. Physically, this means that when the concurrence is high, the two qubits are more likely to be found in the same quantum state, while when it is low, they are more likely to be found in different states.
 
Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
I am not sure if this falls under classical physics or quantum physics or somewhere else (so feel free to put it in the right section), but is there any micro state of the universe one can think of which if evolved under the current laws of nature, inevitably results in outcomes such as a table levitating? That example is just a random one I decided to choose but I'm really asking about any event that would seem like a "miracle" to the ordinary person (i.e. any event that doesn't seem to...
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