In Erwin Schrödinger’s most famous thought experiment, a cat is seemingly able to be alive and dead simultaneously, as it exists in superposition within a closed box alongside a radioactive atom, a detector, a hammer, and a vial of poison.
Now, reaching into similar mind-bending territory that blurs the lines between practical science and science fiction, researchers in China report in a new study that they have successfully used nonlocal artificial materials to create what they call “photonic parallel spaces,” emulating the effects of wormholes, and even multiple realities.
At the heart of the new research are optical systems, in which a single material is able to perform the role of two distinct optical devices at the same time—not unlike the bizarre “superposition” of Schrödinger’s cat—whereby light is able to display multiple properties at once.
The experiments, detailed in a new paper in Nature Communications, allowed the researchers to produce invisible pathways and other optical effects that could pave the way toward the creation of a range of new technological applications in the coming years.
Photonic Parallel Spaces
“The concepts of the multiverse and wormholes in dimensions beyond our physical space have long captivated curiosity and imagination,” the authors of the new paper write. However, demonstrating such ideas in an experimental setting has long been challenging.
To overcome such hurdles, the research team relied on special artificial materials that allowed them to develop what they characterize as a “photonic analogy” of parallel spaces, which they describe as conditions where “two distinct effective optical media coexist within a single artificial material,” each of which is accessible using different boundaries in the respective material.
The team’s method, which was complemented with machine learning for their study, successfully helped them to create analogies for what they call “photonic wormholes,” which function as invisible optical tunnels, as well as “photonic multiple realities” where the independent function of two different optical devices occurred within a single location. The effect, the researchers describe, produced optical scatterers that functioned “as if they exist in separate dimensions.”
“Higher-Dimensional Phenomena” in the Lab
When light enters one boundary in the artificial materials used by the team, it experiences an entirely different set of optical effects compared with light entering from another boundary. Surprisingly, each of these optical experiences can occur without any interference between them.
The researchers liken this effect to C.S. Lewis’s classic, The Lion, the Witch, and the Wardrobe, where different “doors” could lead to entirely separate worlds located in a single place.
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