Through the Quantum Looking Glass
By serving to scientists management an odd however helpful phenomenon of quantum mechanics, an ultrathin invention might make future computing, sensing, and encryption applied sciences remarkably smaller and extra highly effective. The system is described in new analysis that was lately printed within the journal Science.
This system might exchange a roomful of tools to hyperlink photons in a weird quantum impact known as entanglement, based on scientists at Sandia National Laboratories and the Max Planck Institute for the Science of Light. It is a form of nano-engineered materials known as a metasurface and paves the way in which for entangling photons in complicated ways in which haven’t been potential with compact applied sciences.
When photons are stated to be entangled, it means they’re linked in such a means that actions on one have an effect on the opposite, regardless of the place or how far aside the photons are within the universe. It is a spooky impact of quantum mechanics, the legal guidelines of physics that govern particles and different very tiny issues.
Although the phenomenon may appear weird, researchers have harnessed it to course of data in new methods. For instance, entanglement helps shield delicate quantum data and appropriate errors in quantum computing, a field that may someday have sweeping impacts on science, finance, and national security. Entanglement is also enabling advanced new encryption methods for secure communication.
Research for the groundbreaking device, which is a hundred times thinner than a sheet of paper, was conducted, in part, at the Center for Integrated Nanotechnologies, a Department of Energy Office of Science user facility operated by Sandia and Los Alamos national laboratories. Sandias team received funding from the Office of Science, Basic Energy Sciences program.
Light goes in, entangled photons come out
The new metasurface acts as a portal to this unusual quantum phenomenon. In some ways, its like the mirror in Lewis Carrolls Through the Looking-Glass, through which the young protagonist Alice experiences a strange, new world.
Instead of walking through their new device, scientists shine a laser through it. The beam of light passes through an ultrathin sample of glass covered in nanoscale structures made of a common semiconductor material called gallium arsenide.
It scrambles all the optical fields, said Sandia senior scientist Igal Brener. He is an expert in a field called nonlinear optics and led the Sandia team. Occasionally, he said, a pair of entangled photons at different wavelengths emerge from the sample in the same direction as the incoming laser beam.
Brener said he is enthusiastic about this device because it is designed to produce complex webs of entangled photons. Instead of just one pair at a time, it can produce several pairs all entangled together, and some that can be indistinguishable from each other. Some technologies require these complex varieties of so-called multi-entanglement for sophisticated information processing schemes.
Although other miniature technologies based on silicon photonics can also entangle photons, they lack the much-needed level of complex, multi-entanglement. Until now, the only way to produce such results was with multiple tables full of lasers, specialized crystals, and other optical equipment.
It is quite complicated and kind of intractable when this multi-entanglement needs more than two or three pairs, Brener said. These nonlinear metasurfaces essentially achieve this task in one sample when before it would have required incredibly complex optical setups.
The Science paper outlines how the team successfully tuned their metasurface to produce entangled photons with varying wavelengths. This was a critical precursor to generating several pairs of intricately entangled photons simultaneously.
However, the scientists note in their paper that the efficiency of their device the rate at which they can generate groups of entangled photons is lower than that of other techniques and will need to be improved.
What is a metasurface?
A metasurface is a synthetic material that interacts with light and other electromagnetic waves in ways conventional materials cant. Brener said that commercial industries are busy developing metasurfaces because they take up less space and can do more with light than, for instance, a traditional lens.
You now can replace lenses and thick optical elements with metasurfaces, Brener said. Those types of metasurfaces will revolutionize consumer products.
Sandia is one of the leading institutions in the world performing research in metasurfaces and metamaterials. Between its Microsystems Engineering, Science and Applications complex, which manufactures compound semiconductors, and the nearby Center for Integrated Nanotechnologies, scientists have access to all the specialized tools they need to design, fabricate, and analyze these ambitious new materials.
The work was challenging as it required precise nanofabrication technology to obtain the sharp, narrowband optical resonances that seed the quantum process of the work, said Sylvain Gennaro, a former postdoctoral researcher at Sandia who worked on several aspects of the project.
The device was designed, fabricated, and tested through a partnership between Sandia and a research group led by physicist Maria Chekhova. She is an expert in the quantum entanglement of photons at the Max Planck Institute for the Science of Light.
Metasurfaces are leading to a paradigm shift in quantum optics, combining ultrasmall sources of quantum light with far-reaching possibilities for quantum state engineering, said Toms Santiago-Cruz. He is a member of the Max Plank team and first author on the paper.
Brener, who has studied metamaterials for more than a decade, said this newest research could possibly spark a second revolution one that sees these materials developed not just as a new kind of lens, but as a technology for quantum information processing and other new applications.
There was one wave with metasurfaces that is already well established and on its way. Maybe there is a second wave of innovative applications coming, he said.
Reference: Resonant metasurfaces for generating complex quantum states by Toms Santiago-Cruz, Sylvain D. Gennaro, Oleg Mitrofanov, Sadhvikas Addamane, John Reno, Igal Brener and Maria V. Chekhova, 25 August 2022, Science.