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?




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