Quantum Entanglement (A source saying QE exceeds the Speed of Light)

[Atran]

Hi,

... Here we put stringent experimental bounds on the speed of all such hypothetical influences. We performed a Bell test during more than 24 hours between two villages separated by 18 km and approximately east-west oriented, with the source located precisely in the middle. We continuously observed 2-photon interferences well above the Bell inequality threshold. Taking advantage of the Earth's rotation, the configuration of our experiment allowed us to determine, for any hypothetically privileged frame, a lower bound for the speed of this spooky influence. For instance, if such a privileged reference frame exists and is such that the Earth's speed in this frame is less than 10^-3 that of the speed of light, then the speed of this spooky influence would have to exceed that of light by at least 4 orders of magnitude.

Source: http://arxiv.org/abs/0808.3316

I haven't studied more than the basics in QM. Therefore I don't understand the math behind quantum entanglement.

Any Ideas/Suggestion/Critics about the source?
Thanks.

 

[DrChinese]

Hi,

Source: http://arxiv.org/abs/0808.3316

I haven't studied more than the basics in QM. Therefore I don't understand the math behind quantum entanglement.

Any Ideas/Suggestion/Critics about the source?
Thanks.

What this study says is: IF Quantum Entanglement involves FTL interactions, it must be at least 10,000c. It is generally speculated that if Quantum Entanglement involves FTL interactions, it is actually instantaneous (infinite c). So this study sets a floor.

However, there are other explanations for QE that do not involve FTL interactions. These are the so-called non-realistic or contextual groups.

 

[Atran]

What is an FTL interaction?

 

[billbray]

here's a crazy article about Faster Than Light photon propagation:

http://www.nature.com/nature/journal/v406/n6793/full/406243a0.html