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Physicists have shown that simulating models of hypothetical time travel can solve experimental problems that appear impossible to solve using standard physics. Credit: Yaroslav Kushta via Getty Images
“Imagine that you want to send a gift to someone: you need to send it on day one to make sure it arrives on day three. However, you only receive that person’s wish list on day two. So, in this chronology-respecting scenario, it’s impossible for you to know in advance what they will want as a gift and to make sure you send the right one. Now imagine you can change what you send on day one with the information from the wish list received on day two.
Their results showed that the team can use time travel simulations to retroactively change the original photons, even if they only learn how to prepare the photons after reaching the sample. However, the team also noted that this effect was only observable in one out of four experimental runs, meaning the simulation has a 75% chance of failure.
They also recommend using a filter to remove the “uncorrected” photons while the updated photons pass to the camera. At best, said Arvidsson-Shuku, the experiment will produce the desired results a quarter of the time, which is tantamount to getting the desired “gift” one in four times. Moreover, if the “gifts” are inexpensive, many can be sent over extended periods, eventually leading to a statistically significant number of desirable outcomes.
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