Two researchers at the University of Notre Dame in collaboration with South Koreas KyungHeeUniversity recently utilized quantum computing to help develop a new transparent window coating capable of blocking solar heat. In findings published in ACS Energy Levels, Tengfei Luo, Notre Dames DoriniFamily Professor of Energy Studies, and postdoctoral associate,SeongminKim, worked together to devise their transparent radiative cooler (TRC) layer, which only permits external visible light that doesnt raise indoor temperatures, thus cutting buildings cooling costs by as much as a third of current rates. According to the International Energy Agency, air conditioning and electric fans comprise 20 percent of buildings energy costs around the worldroughly 10 percent of human electricity consumption.

To determine the absolute best materials configuration, the team relied on machine learning and the promising field of quantum computing for a solution. Although in its relatively early phases of development, quantum computing offers immense potential due to its ability to far surpass traditional computing methods. Currently, even the most advanced of classical supercomputers rely on a binary staterepresenting information as 1s and 0sto do all their calculations, meaning that there are limits to what they can and cant achieve. Quantum computing, in contrast, can represent information as either 1, 0, or a combination of the two. This hypothetically gives scientists a massive advantage in numerous fields, such as natural science simulations and nuclear fusion research.

[Related: In photos: Journey to the center of a quantum computer.]

In order for Luo and Kims TRC design to work properly, incredibly thin layers of materials needed to be compiled in an exact way to ensure optimal heat reduction. In this case, machine learning and quantum computing teamed up to test models within fractions of a second, parsing through virtually ever possible mixture and material combination to find the best one.

The result is a 1.2 micron-thick layering of silica, alumina, and titanium oxide upon a glass base that is then coated with the same polymer used in contact lenses. The new combination subsequently outperformed other heat-reduction glass coating currently available. I think the quantum computing strategy is as important as the material itself,Luo said in a press release from the University of Notre Dame yesterday. Using this approach, we were able to find the best-in-class material, design a radiative cooler and experimentally prove its cooling effect.

As advancements progress, these kinds of transparent heat-reducing layers can be increasingly applied to windows and glass structures in order to help dramatically lower energy emissions as the world races to stave off climate changes worst potential futures.

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Quantum computing used to design heat-blocking glass | Popular Science

Researchers have used Google's Sycamore quantum computer to simulate a simplified wormhole for the first time, and sent a piece of quantum information through it

By Leah Crane

Simulations on a quantum computer show how information might travel through a wormhole

inqnet/A. Mueller (Caltech)

A quantum computer has been used to simulate a holographic wormhole for the first time. In this case, the word holographic indicates a way to simplify physics problems involving both quantum mechanics and gravity, not a literal hologram, so simulations like this could help us understand how to combine those two concepts into a theory ofquantum gravity perhaps the toughest and most important problem in physics right now.

Both quantum mechanics, which governs the very small, and general relativity, which describes gravity and the very large, are extraordinarily successful in their respective realms, but these two fundamental theories do not fit together. This incompatibility is particularly apparent in areas where both theories should apply, such as in and around black holes.

These areas are extraordinarily complicated, and that is where holography comes in. It allows physicists to create a less complex system that is equivalent to the original, similar to how a two-dimensional hologram can show three-dimensional details.

Maria Spiropulu at the California Institute of Technology and her colleagues used Googles Sycamore quantum computer to simulate a holographic wormhole a tunnel through space-time with black holes at either end. They simulated a type of wormhole through which a message could theoretically pass, and examined the process by which such a message could make that journey.

In a real wormhole, that journey would be largely mediated by gravity, but the holographic wormhole uses quantum effects as a substitute for gravity to remove relativity from the equation and simplify the system. That means that when the message passes through the wormhole, it is actually undergoing quantum teleportation a process by which information about quantum states can be sent between two distant but quantum entangled particles. For this simulation, the message was a signal containing a quantum state a qubit in a superposition of both 1 and 0.

The signal scrambles, it becomes mush, it becomes chaos, and then it gets put back together and appears immaculate on the other side, says Spiropulu. Even on this tiny system we could prop up the wormhole and observe just what we expected. This occurs because of the quantum entanglement between the two black holes, which allows the information falling into one end of the wormhole to be preserved at the other end. That process is part of why a quantum computer is useful for this type of experiment.

The simulation used only nine quantum bits, or qubits, so it was very low-resolution. Like a picture of a bird taken from far away, this had the same general shape as the object it represented, but the simulation had to be carefully adjusted to display the characteristics of a wormhole. If you want to see this as a wormhole, there are a number of parallels, but its definitely a matter of interpretation, says Adam Brown at Stanford University in California, who was not involved in this work.

Using a more powerful quantum computer could help bring the image into focus. This is just a baby wormhole, a first step to test the theories of quantum gravity, and as the quantum computers scale up we have to start using bigger quantum systems to try to test the bigger ideas in quantum gravity, says Spiropulu.

That is crucial because some theories of quantum gravity are difficult or even impossible to completely understand using only classical computing. We know that quantum gravity is very confusing, the theory can be very hard to extract predictions from, and the dream would be to do something on a quantum computer that tells you things you dont already know about quantum gravity, says Brown. This is not that this is a very small quantum computer, so everything about it is completely possible to simulate on a laptop without the fan even starting.

But the simulations similarityto a real wormhole hints that it may be possible to use quantum computers to formulate and test ideas about quantum gravity, and maybe eventually to understand it.

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A quantum computer has simulated a wormhole for the first time