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Thread: Physicists Reverse Time Using Quantum Computer

  1. #1

    Physicists Reverse Time Using Quantum Computer

    https://science.slashdot.org/story/1...antum-computer

    Researchers from the Moscow Institute of Physics and Technology teamed up with colleagues from the U.S. and Switzerland and returned the state of a quantum computer a fraction of a second into the past. They also calculated the probability that an electron in empty interstellar space will spontaneously travel back into its recent past. The study is published in Scientific Reports.

    Quantum physicists from MIPT decided to check if time could spontaneously reverse itself at least for an individual particle and for a tiny fraction of a second. That is, instead of colliding billiard balls, they examined a solitary electron in empty interstellar space. "Suppose the electron is localized when we begin observing it. This means that we're pretty sure about its position in space. The laws of quantum mechanics prevent us from knowing it with absolute precision, but we can outline a small region where the electron is localized," says study co-author Andrey Lebedev from MIPT and ETH Zurich. The physicist explains that the evolution of the electron state is governed by Schrodinger's equation. Although it makes no distinction between the future and the past, the region of space containing the electron will spread out very quickly. That is, the system tends to become more chaotic. The uncertainty of the electron's position is growing. This is analogous to the increasing disorder in a large-scale system -- such as a billiard table -- due to the second law of thermodynamics.

    "However, Schrodinger's equation is reversible," adds Valerii Vinokur, a co-author of the paper, from the Argonne National Laboratory, U.S. "Mathematically, it means that under a certain transformation called complex conjugation, the equation will describe a 'smeared' electron localizing back into a small region of space over the same time period." Although this phenomenon is not observed in nature, it could theoretically happen due to a random fluctuation in the cosmic microwave background permeating the universe. The team set out to calculate the probability to observe an electron "smeared out" over a fraction of a second spontaneously localizing into its recent past. It turned out that even across the entire lifetime of the universe -- 13.7 billion years -- observing 10 billion freshly localized electrons every second, the reverse evolution of the particle's state would only happen once. And even then, the electron would travel no more than a mere one ten-billionth of a second into the past.

    The researchers then attempted to reverse time in a four-stage experiment by observing the state of a quantum computer made of superconducting qubits, instead of an electron. The researchers "found that in 85 percent of the cases, the two-qubit quantum computer returned back into the initial state," reports Phys.Org. "When three qubits were involved, more errors happened, resulting in a roughly 50 percent success rate. According to the authors, these errors are due to imperfections in the actual quantum computer. As more sophisticated devices are designed, the error rate is expected to drop."
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  3. #2
    Did time reverse- or did a particle?

    This means that we're pretty sure about its position in space. The laws of quantum mechanics prevent us from knowing it with absolute precision,
    Last edited by Zippyjuan; 03-14-2019 at 07:51 PM.


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  4. #3
    Quote Originally Posted by Zippyjuan View Post
    Did time reverse- or did a particle?
    BOTH
    Time is the construct-a unit of measure, the POSITION of the part. is what changed, but it went BACK to where it was without MOVING...

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  5. #4
    How many Physicists does it take to reset a clock?


    sounds like a bunch of Hockey Stick to me.
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    My brain jumps back even more than a billionth of a second all the time.
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  7. #6
    So....if you scaled this up that so that you could send a human back in time...the human would actually just get younger as time continued to move forward. The only way, using this method, to "go back in time" would be to do this to every other molecule in the entire universe. In other words......meh.
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  8. #7
    I knew going back in time was a possibility.
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  9. #8
    Clickbait. They didn't "reverse time," they returned something to a previous state. By this definition, you'd be time traveling when you stay in your old room at your parents' house.

    Having said that, it was a remarkable experiment, because what they are talking about is reversing entropy.
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