Replies

So how do they look at the “entangled” particles in order to determine that they are “entangled” when they are at opposite ends of the universe.

If you can know the position of a particle, you can’t know with certainty its velocity, and vice versa.

At the quantum level, measuring a particle’s velocity changes it, and measuring a particle’s position changes it.

So how do they look at the “entangled” particles in order to determine that they are “entangled” when they are at opposite ends of the universe.

That's what the computer models say and as we all know computer models are never wrong

“At the quantum level, measuring a particle’s velocity changes it, and measuring a particle’s position changes it.”

Please forgive my ignorance when I ask this. I know next to nothing about quantum mechanics.

When they say that “measuring a particle’s position” changes it, is it due to the fact that some new particles are required to measure said particle?

Let me try and explain it this way. Suppose I am measuring an electric circuit. It behaves a certain way under “unobserved” conditions.

Now, let’s say that I want to “observe” a node of the circuit with an oscilloscope probe. When I measure this node, I am actually changing the conditions of the circuit as the scope probe typically has capacitance, inductance, etc. itself.

Now, let’s say I am measuring something “simple” ... like a 60Hz, 5V peak-to-peak sine wave. These new parasitics I am introducing to the system via the scope probe aren’t a big problem. They have virtually no impact on the circuit.

However, suppose I was trying to measure a high speed transceiver running at mutli-gigabit data rates. The same scope probe could cause substantial problems in that the added parasitics will cause the circuit to behave differently.

(Yes, some idiots I used to work with once “solved” a problem by adding a 10pF capacitor to a broken circuit since they saw that adding a scope probe actually made a circuit work ... sadly, that circuit failed torture testing, but that’s a whole other story).

Now, when they say that observing something on the quantum scale has an effect on the particle, is it due to conditions similar to my analogy (i.e. things like lasers/light or what have you impact the particle’s behavior), or am I way the hell off and have far too much to learn :-)?