For the first time, researchers transformed light into a quantum crystalline structure to create a “supersolid” that’s both solid and liquid at the same time. Here’s what that means, and why it’s such a big step forward.
Category: quantum physics – Page 78
New Experiment To Look for Quantum Noise of Space Itself
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Physicists are stuck on trying to figure out why gravity and quantum mechanics don’t get along. For almost 100 years now, they have been looking for a theory of quantum gravity to solve the problem. But one of the most general expectations of a quantization of gravity is that space also has quantum fluctuations. And a team of researchers from Caltech now says they’ve got a tabletop experiment which could find those fluctuations. Could this solve the problem? Let’s take a look.
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Quantum Holograms Transform Light Into Unbreakable Security
Quantum entanglement, one of the strangest and most powerful aspects of physics, has just been taken to a new level with the use of metasurfaces.
Researchers have discovered a way to create quantum holograms, where entangled photons encode intricate information with unprecedented precision. By leveraging the properties of metasurfaces, they demonstrated control over entangled holographic letters, opening doors to secure quantum communication and even anti-counterfeiting technology.
Unlocking the mysteries of quantum entanglement.
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Sabine (@SabineHossenfelder) argues that superdeterminism eliminates free will, challenging the idea of causal choice and possibly undermining science if the laws of physics govern all phenomena. However, inspired by daily life experiences in Southern California, I present a defense of indeterminism, countering the claim that everything is predetermined, while also exploring the ideas of cosmologists Raphael Bousso and Alan Guth.
Sabine Hossenfelder, a theoretical physicist, has argued in favor of superdeterminism, a theory that suggests the universe is deterministic and that our choices are predetermined.
Does Superdeterminism save Quantum Mechanics? Or does it kill free will and destroy science? https://www.youtube.com/watch?v=ytyjgIyegDI
According to her, the apparent randomness in quantum mechanics is an illusion, and the universe is actually a predetermined, clockwork-like system. She claims that if we knew enough about the initial conditions of the universe, we could predict every event, including human decisions.
Hossenfelder’s argument relies on the idea that the randomness in quantum mechanics is not fundamental, but rather a result of our lack of knowledge about the underlying variables. She suggests that if we could access these “hidden variables,” we would find that the universe is deterministic. However, this argument is flawed.
For example, consider the double-slit experiment, where particles passing through two slits create an interference pattern on a screen. Hossenfelder would argue that the particles’ behavior is predetermined, and that the apparent randomness is due to our lack of knowledge about the initial conditions. However, this ignores the fact that the act of observation itself can change the outcome of the experiment, a phenomenon known as wave function collapse.
D-Wave claims its quantum computers can solve a problem of scientific relevance much faster than classical methods
A team of quantum computer researchers at quantum computer maker D-Wave, working with an international team of physicists and engineers, is claiming that its latest quantum processor has been used to run a quantum simulation faster than could be done with a classical computer.
In their paper published in the journal Science, the group describes how they ran a quantum version of a mathematical approximation regarding how matter behaves when it changes states, such as from a gas to a liquid—in a way that they claim would be nearly impossible to conduct on a traditional computer.
Over the past several years, D-Wave has been working on developing quantum annealers, which are a subtype of quantum computer created to solve very specific types of problems. Notably, landmark claims made by researchers at the company have at times been met with skepticism by others in the field.
Boosting the response speed of quantum LEDs via an excitation memory effect
Light-emitting diodes (LEDs) are widely used electroluminescent devices that emit light in response to an applied electric voltage. These devices are central components of various electronic and optoelectronic technologies, including displays, sensors and communication systems.
Over the past decades, some engineers have been developing alternative LEDs known as quantum LEDs (QLEDs), which utilize quantum dots (i.e., nm-size semiconducting particles) as light-emitting components instead of conventional semiconductors. Compared to traditional LEDs, these quantum dot-based devices could achieve better energy-efficiencies and operational stabilities.
Despite their potential, most QLEDs developed so far have been found to have significantly slower response speeds than typical LEDs using inorganic III-V semiconductors. In other words, they are known to take a longer time to emit light in response to an applied electrical voltage.
The Future Of Quantum Computing: 10 Bold Predictions
What excites you the most about the potential of quantum computers?
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