The debate over the existence of unseen universes may seem rather pie-in-the-sky. Sabine Hossenfelder, a theoretical physicist at the Frankfurt Institute for Advanced Studies, has called the multiverse “the most controversial idea in physics.” But physicists didn’t pull the idea out of thin air - rather, several distinct lines of reasoning seem to point to the multiverse’s existence, bolstering the idea’s merit. Advocates on the two sides show no mercy toward each other in their books, on their blogs, and, of course, on Twitter. Ask a prominent physicist whether they believe in a multitude of universes beyond our own, and you’ll get either a resounding yes or a vehement no, depending on whom you encounter. While Hollywood can’t seem to get enough of the multiverse, it remains deeply controversial among scientists. Read More: Is the Multiverse Theory Science Fiction or Science Fact? Just as time travel allowed Marty McFly to experience different timelines in the Back to the Future series, multiverse tales allow characters to explore a multitude of worlds with varying degrees of similarity to our own, as well as altered versions of themselves. (Or, at least, in the current phase of the Marvel Cinematic Universe.) Its appeal as a storytelling device is obvious. The idea of the multiverse - the provocative notion that our universe is just one of many- has fully cemented itself in mainstream pop culture. Though they’re not particularly heavy on the physics, these films are definitely latching onto something. Films like Doctor Strange in the Multiverse of Madness and Everything Everywhere All at Once entice the viewer with multiple versions of various characters and a dizzying array of alternate realities. Instead, it seems the entire multiverse is having its Hollywood moment. These days, one parallel universe is hardly enough for science fiction. Observing these small but significant differences, Kirk muses that the crew has materialized in “a parallel universe coexisting with ours on another dimensional plane.” They appear aboard the Enterprise, but things are askew: Crew members greet the captain with Nazi-style salutes, and First Officer Spock sports a goatee. The trouble starts when they attempt to beam up from a planet during an ion storm. If you live on this planet - and you’re of a certain age - there’s a decent chance you’ve seen the classic Star Trek episode “mirror, mirror,” in which Captain Kirk and several members of the enterprise find themselves in what appears to be a parallel universe. Click here to subscribe to read more stories like this one. (c) The energy levels and transitions used for the demonstration of the three level dynamical decoupling sequence.This story was originally published in our Mar/Apr 2023 issue. The RF and microwave (MW) antenna drive the transitions around 100 MHz and 1 GHz, respectively. The radio frequency (RF) blades are made of whole blades, the DC blades have five segments to fine-tune the potential and ion position. (b) The ion trap system with segmented blades. After the sequence, we measure the fidelity between the final state and the prepared state by reversing the preparation sequence and detect the fidelity of | 0 〉. During the experiment, we prepare the superposition states from | 0 〉 and apply the dynamical decoupling sequence with various τ. The total sequence consists of N repetitions of the basic unit, which includes three pairs of π pulses, denoted as π i j for transition | i 〉 ↔ | j 〉, separated by duration τ. (a) Scheme of dynamical decoupling sequence. Scheme of the dynamical decoupling sequence and the experimental setup.
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