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B Time dilation and quantum entanglement.

  1. Apr 12, 2017 #1
    Please forgive any misconceptions or grevious errors, quantum mechanics and relativistic physics is something I read and think about as a hobby and not a career.

    My question is this, does the entanglement or two particles transcend time difference?

    To expand, let's say we have two communication devices, each of the quantum sort that send data through quantum entanglement.
    Device A stays in our current time.
    Device B is accelerated to relativistic speeds so that time dilates for Device B relative to real time (device A's time space).
    Device B by some means is decelerated.
    Would information sent by Device B be received in the past?

    A side note, I'm not entirely sure that true time travel is possible and this completely voids my question. I think it's better to think of time dilation as taking a shortcut for the dilated area. Even if we accelerate Device B to relativistic speeds, it's not in the future, it simply spent shortened the perceived travel time for the accelerated device, but it likely won't reach a future date that hasn't happened yet. In writing this I see that my original question would be impossible, but I still want to hear your thoughts on entanglement and time travel.
  2. jcsd
  3. Apr 12, 2017 #2
    Also I see that similar questions on this topic have been asked before
  4. Apr 12, 2017 #3


    Staff: Mentor

    As you seem to realize, the question as you pose it is not well-defined. Here is a well-defined question: Does entanglement work in a relativistic setting? The answer to that is yes: relativistic quantum theory, i.e., quantum field theory, includes entanglement, and it works basically the same as it does in non-relativistic quantum theory.

    Here, however, is another well-defined question: Can entanglement be used to send information faster than light? The answer to that is no. In order to use entanglement to send information, people who make measurements on entangled particles have to share their results, and that sharing must be done by ordinary, light-speed limited information channels.

    As I pointed out in response to a post of yours in another thread, "real time" does not exist in relativity; time is not absolute. I would recommend working through a good basic textbook on SR, such as Taylor & Wheeler's Spacetime Physics.
  5. Apr 12, 2017 #4


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    Gold Member

    You can't send data through quantum entanglement. Quantum entanglement is more like shared random number generator.
    I suppose it is rather popular to abuse the myth that quantum entanglement can be used to send the data in science fiction. After all you have to provide some explanation for fictional FTL device and besides "entanglement" sounds like it's real science, right? :wink:
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