Methods of keeping photons entangled for extended periods?

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This discussion centers on methods to maintain photon entanglement for extended durations, specifically in the context of retro-causality experiments. The participant expresses interest in delaying the travel time of entangled photons, potentially using techniques like reflecting photons between mirrors or utilizing Bose-Einstein Condensates to slow light. The longest recorded entanglement duration mentioned is one hour, although it does not involve photons. The conversation highlights the challenges of transmitting information through retro-causal experiments.

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CosmicVoyager
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Greetings,

I am interested in conducting a retro-causality experiment to send a bit of data back in time. I would like to delay how long it takes one of a pair of entangled photons to reach a part of the experiment for an extended period of time such as an hour.

What ways are there to keep a photon in superposition? Is there a way to reflect between mirrors indefinitely?

I read that a Bose-Einstein Condensate could slow light. How does that work? How long of a delay could be created that way?

Thanks
 
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CosmicVoyager said:
Greetings,

I am interested in conducting a retro-causality experiment to send a bit of data back in time. I would like to delay how long it takes one of a pair of entangled photons to reach a part of the experiment for an extended period of time such as an hour.

...

Here is the longest I have seen anything entangled... it is an hour but it is not a photon:

http://lanl.arxiv.org/abs/1006.4344

What kind of retro-causal experiment are you thinking about? There have already been a number performed. But they do not support transmission of information.
 

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