I Wondering why quantum entanglement occurs

Click For Summary
Quantum entanglement occurs due to conservation laws, particularly the conservation of spin angular momentum. When two spin 1/2 particles are generated from a spin zero system, their spins must be equal and opposite upon measurement. Unlike classical particles, the spins of quantum particles are not predetermined at creation, yet their measurements remain perfectly correlated. This phenomenon is referred to as quantum non-locality, which is a central aspect of quantum mechanics. Understanding these principles clarifies the nature of quantum entanglement.
ebmg123
Messages
2
Reaction score
0
hi there
I am an engineer but have a huge interest in physics and wanted to ask anyone who has any knowledge of why quantum entanglement occurs?
 
Physics news on Phys.org
ebmg123 said:
why quantum entanglement occurs?
The conservation laws is one reason. E.g. conservation of spin angular momentum. If two spin 1/2 particles are created from a spin zero system, and you measure the spin of them both about some axis, then the measured spins must be equal and opposite.

Note that the same is true for classical particles. The difference is that in QM the particles spin is not determined at creation yet the measurements are perfectly correlated. This is often known as quantum non-locality. That's what all the fuss is about!
 
Reply
  • Like
Likes DrChinese, ebmg123, vanhees71 and 2 others
thnx a bunch that makes allot more sense
 

Thread 'Angular Momentum Vector and Its Magnitude'

For the quantum state ##|l,m\rangle= |2,0\rangle## the z-component of angular momentum is zero and ##|L^2|=6 \hbar^2##. According to uncertainty it is impossible to determine the values of ##L_x, L_y, L_z## simultaneously. However, we know that ##L_x## and ## L_y##, like ##L_z##, get the values ##(-2,-1,0,1,2) \hbar##. In other words, for the state ##|2,0\rangle## we have ##\vec{L}=(L_x, L_y,0)## with ##L_x## and ## L_y## one of the values ##(-2,-1,0,1,2) \hbar##. But none of these...
View full post »

Similar threads

B Quantum Entanglement in Practice
Replies
2
Views
2K
I Why is entanglement necessary in a quantum computer?
Replies
8
Views
2K
B Quantum entanglement and simultaneity
Replies
4
Views
3K
I When does quantum entanglement occur?
Replies
5
Views
2K
I How does a process of a Raman transition break quantum entanglement?
Replies
6
Views
2K
I How Do You Break Quantum Entanglement Bonds?
Replies
7
Views
6K
I Calculating qubit purity/entanglement in a quantum computer
Replies
0
Views
1K
I Quantum Entanglement and Parallel Worlds/Existence
Replies
7
Views
2K
I Can anyone explain me this quantum entanglement experiment
Replies
4
Views
2K
A Is delayed choice remote entanglement of photons derived from TDSE?
2
Replies
58
Views
4K