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Physicists Say Time Travel Can Be Simulated Using Quantum Entanglement - Yahoo News

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Source: https://news.yahoo.com/physicists-simulate-time-travel-using-120000565.html

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The quantum world operates by different rules than the classical one we buzz around in, allowing the fantastical to the bizarrely normal.Physicists have described using quantum entanglement to simulate a closed timelike curve—in layman’s terms, time travel.Before we proceed, I’ll stress that no quantum particles went back in time.The recent research was a Gedankenexperiment, a term popularized by Einstein to describe conceptual studies conducted in lieu of real tests—a useful thing when one is testing physics at its limits, like particles moving at the speed of light.But a proposed simulation involves “effective time travel,” according to the team’s recent paper in Physical Review Letters, thanks to a famously strange way that quantum particles can interact.Read more2023 Is The Best Year For Games In A While (And Maybe Ever?)As Tributes to Matthew Perry Pour in, the World Awaits Word From His 'Friends' Co-StarsR.I.P.Night Court star Richard MollXbox Is Banning 'Unauthorized' Controllers And AccessoriesThese Are The Cars You Would Use To Curse Your Worst EnemyThe team demonstrated that one could “probabilistically improve one’s past choice,” explained study co-author Nicole Yunger Halpern, a physicist at the National Institute of Standards and Technology and the University of Maryland at College Park, in an email to Gizmodo, though she noted that the proposed time travel simulation has not yet taken place.In their study, the apparent time travel effect would occur one time in four—a failure rate of 75%. To address the high failure rate, the team suggests sending a large number of entangled photons, using a filter to ensure the photons with the corrected information got through while sifting out the outdated particles.“The experiment that we describe seems impossible to solve with standard (not quantum) physics, which obeys the normal arrow of time,” said David Arvidsson-Shukur, a quantum physicist at the University of Cambridge and the study’s lead author, in an email to Gizmodo.“Thus, it appears as if quantum entanglement can generate instances which effectively look like time travel.”The behavior of quantum particles—specifically, the ways in which those behaviors differ from macroscopic phenomena—are a useful means for physicists to probe the nature of our reality.Entanglement is one aspect of how quantum things operate by different laws.Last year, another group of physicists claimed that they managed to create a quantum wormhole—basically, a portal through which quantum information could instantaneously travel.The year before, a team synchronized drums as wide as human hairs using entanglement.And the 2022 Nobel Prize in Physics went to three physicists for their interrogation of quantum entanglement, which is clearly an important subject to study if we are to understand how things work.A simulation offers a means of probing time travel without worrying about whether it’s actually permitted by the rules of the universe.“Whether closed timelike curves exist in reality, we don’t know. The laws of physics that we know of allow for the existence of CTCs, but those laws are incomplete; most glaringly, we don’t have a theory of quantum gravity,” said Yunger Halpern.“Regardless of whether true CTCs exist, though, one can use entanglement to simulate CTCs, as others showed before we wrote our paper.”In 1992, just a couple weeks before Hawking’s paper was published, the physicist Kip Thorne presented a paper at the 13th International Conference on General Relativity and Gravitation.Thorne concluded that, “It may turn out that on macroscopic lengthscales chronology is not always protected, and even if chronology is protected macroscopically, quantum gravity may well give finite probability amplitudes for microscopic spacetime histories with CTCs.” In other words, whether time travel is possible or not is a quandary beyond the remit of classical physics.And since quantum gravity remains an elusive thing, the jury’s out on time travel.But in a way, whether closed-timelike curves exist in reality or not isn’t that important, at least in the context of the new research.What’s important is that the researchers think their Gedankenexperiment provides a new way of interrogating quantum mechanics. It allows them to take advantage of the quantum realm’s apparent disregard for time’s continuity in order to achieve some fascinating results.The headline and text of this article have been updated to clarify that the team describe a way that time travel can be simulated; they did not simulate time travel in this experiment.More: Scientists Tried to Quantum Entangle a TardigradeMore from GizmodoMegan Fox snarkily flouts SAG-AFTRA’s controversial Halloween guidelinesHere's What It Took To End The Autoworkers StrikesWhat We Loved And Hated In Spider-Man 2 On PS5What's The Most Annoying Car In Your Area?San Francisco Plans To Close A Legal Loophole That Lets Thieves Get Away With Car Break-InsSign up for Gizmodo's Newsletter.For the latest news, Facebook, Twitter and Instagram.Click here to read the full article.

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