Tuesday 19 November 2019

quantum mechanics - What is the "monogamy principle" in entanglement?


What does the "monogamy" principle imply? At a superficial level, it seems to say that a particle can be entangled with at most one other particle.


However, I keep reading that several particles are entangled. For example:





  1. Quantum entanglement can reach into the past. Here they describe an experiment with two entangled pairs, $(A_1, A_2)$ and $(B_1, B_2)$. Victor is given $A_2, B_2$, Alice is given $A_1$ and Bob is given $B_1$. All three are separated by a large distance. If Victor entangles $A_2, B_2$ then he has entangled $A_1$ and $B_1$ as well. This somehow implies that each particle can be entangled with more than 1.




  2. 3,000 atoms entangled in bizarre state. Scientists somehow entangled $\approx$ 3000 atoms.




Both imply that entanglement is not monogamous. So what does the "monogamy" principle actually imply?




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...