#qm #entanglement #particle #physics
I've been trying to research an answer for this question for some time...
Does anyone out there in Masdo-Land know what the maximum time that physicists have been able to maintain an entangled pair of particles before decoherence?
@Pat
If no ESD (entanglement sudden death) occurs; if there's no decoherence due to interaction with the environment (ex., some measurement is made); if none of the particles decay; the entanglement can last indefinitely.
@mc @shanman
Yeah, the problem is keeping them from interacting with other particles. I was aware of China's Mozi satellite which is testing quantum key distribution and got a distance of 1200km, which works out to about 4ms for those photons. And quantum computers use temperatures close to 0K to try to prevent stuff from happening to them. But there's not much out there as to exactly how long they've been able to maintain it.
Do you know exactly where that 5 second number comes from?
I've never heard ESD before. Since measurement involves a statistical assessment, is ESD the case when an individual particle pair just happens to be on the low side of the probability distribution?
@Pat
Sudden Death of Entanglement
https://arxiv.org/abs/0910.1396
@Pat Near as I can tell, 5 seconds, and this is an awesome question because this answer isn't for entangled photons. Entangled photons can stay entangled for 10⁹ seconds, 31.6887646 years from current estimates. But the problem is trapping them without them getting absorbed or lost. So until there's a solid photon trap, they're going for distance records.