A team of engineers, physicists and quantum specialists at Google Research has found that reducing noise to a certain level allows the company’s sycamore quantum chip to beat classical computers running random circuit sampling (RCS).
Category: quantum physics – Page 219
Harnessing quantum principles: Phased arrays within phased arrays for smarter, greener indoor optical wireless networks
Imagine a future where indoor wireless communication systems handle skyrocketing data demands and do so with unmatched reliability and speed. Traditional radio frequency (RF) technologies like Wi-Fi and Bluetooth are beginning to struggle, plagued by limited bandwidth and increasing signal congestion.
Revolutionary Technology Unlocks Quantum Material Secrets at Atomic Level
Oak Ridge National Laboratory’s new RODAS technology provides detailed insights into atomic changes in materials, critical for advancing quantum computing.
The method’s ability to analyze materials like molybdenum disulfide without damaging them marks a significant improvement over traditional techniques, offering potential breakthroughs in material science.
A team of researchers led by the Department of Energy’s Oak Ridge National Laboratory has developed a novel method for observing changes in materials at the atomic level. This technique opens new avenues for advancing our understanding and development of materials critical for quantum computing and electronics.
New Nanotechnology AIDS in Electron Cooling Without External Sources
Using a nanoscale structure that consisted of a sequential array of a source electrode, a quantum well, a tunneling barrier, a quantum dot, another tunneling barrier, and a drain electrode, researchers were able to suppress electron excitation and cool electrons to −228 °C (−378 °F) without external means at room temperature.
A team of researchers has discovered a way to cool electrons to −228 °C without external means and at room temperature, an advancement that could enable electronic devices to function with very little energy.
The process involves passing electrons through a quantum well to cool them and keep them from heating.
Timekeeping Innovation: Quantum Entanglement Unlocks Unprecedented Precision
Quantum physicists have developed a new type of optical atomic clock, using quantum entanglement among strontium atoms to achieve unprecedented precision.
This breakthrough could significantly impact quantum computing and precision sensing, although it currently operates effectively for only milliseconds.
Quantum Advances in Timekeeping.
Quantum Computing Transformed by Breakthrough Photonic Technology
Researchers have made significant advancements in quantum computing, focusing on photonic-measurement-based quantum computation.
Their study introduces a scalable and resource-efficient method that uses high-dimensional spatial encoding to generate large cluster states. This breakthrough could accelerate the development of faster, fault-tolerant quantum computers.
Overcoming Quantum Computing Challenges
Why the black hole information paradox still hasn’t been solved
But you might notice that something is missing: this radiation doesn’t seem to encode, in any way, knowledge of the information that went into the creation of the black hole in the first place. Somewhere along the way, information was destroyed. That’s the key puzzle behind the black hole information paradox. No one seriously disputes the initial setup of the puzzle: that information exists, and that the information (and entropy) does in fact go into the black hole both when it’s first created and also as it grows. What is up for debate, and what in fact is the big question behind the information paradox, is whether that information comes back out again or not.
The way we calculate what comes out of a black hole via Hawking radiation, despite the fact that Hawking radiation has been around for a full half century as of 2024, hasn’t changed all that much over the past 50 years. What we do is assume the curvature of space from general relativity: the fabric of space is curved by the presence of matter and energy, and general relativity tells us exactly by how much.
We then perform our quantum field theory calculations in that curved space, detailing the radiation that comes out as a result. That’s where we learn that the radiation has the temperature, spectrum, entropy, and other properties we know that it possesses, including the fact that it doesn’t appear to encode that initial information when the radiation comes out.
Physicists reveal nonlinear transport induced by quantum geometry in planar altermagnets
In the quantum world, materials called “altermagnets” behave in unique ways that could pave the way for new technologies.
This unique magnetism makes altermagnets highly promising for the development of new spintronic and electronic devices. It also opens new possibilities for the study of topological materials (i.e., systems with unique electronic properties originating from their electronic structure’s topology).
Researchers at Stony Brook University carried out a study aimed at better understanding the nonlinear response of planar altermagnets. Their paper, published in Physical Review Letters, reports the observation of a non-linear response in these materials derived from their quantum geometry.
“Recently, two experiments have confirmed the predicted role of quantum geometry in the second-order response of the conventional PT-symmetric antiferromagnets,” Sayed Ali Akbar Ghorashi, co-author of the paper, told Phys.org.
Certain quantum systems may be able to defy entropy’s effects forever
A mathematical proof shows that some quantum states can resist nature’s tendency to disorder – but only under very specific conditions.
