Immortality particles called quasiparticles face_with_colon_three
A collective excitation behaving as a single emergent entity, known as a quasiparticle, often becomes unstable when encountering a continuum of many-body excited states. However, under certain conditions, the result can be totally different.
Researchers at the Quantum Machines Unit at the Okinawa Institute of Science and Technology (OIST) are studying levitating materials – substances that can remain suspended in a stable position without any physical contact or mechanical support. The most common type of levitation occurs through magnetic fields. Objects such as superconductors or diamagnetic materials (materials repelled by a magnetic field) can be made to float above magnets to develop advanced sensors for various scientific and everyday uses.
Prof. Jason Twamley, head of the unit, and his team of OIST researchers and international collaborators, have designed a floating platform within a vacuum using graphite and magnets. Remarkably, this levitating platform operates without relying on external power sources and can assist in the development of ultra-sensitive sensors for highly precise and efficient measurements. Their results have been published in the journal Applied Physics Letters.
When an external magnetic field is applied to diamagnetic materials, these materials generate a magnetic field in the opposite direction, resulting in a repulsive force – they push away from the field. Therefore, objects made of diamagnetic materials can float above strong magnetic fields. For instance, in maglev trains, powerful superconducting magnets create a strong magnetic field with diamagnetic materials to achieve levitation, seemingly defying gravity.
When something draws us in like a magnet, we take a closer look. When magnets draw in physicists, they take a quantum look. Scientists from Osaka Metropolitan University and the University of Tokyo have successfully used light to visualize tiny magnetic regions, known as magnetic domains, in a specialized quantum material. Their study was published in Physical Review Letters.
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).
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.
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.
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.
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.
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
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.