By exploiting a physically motivated principle, rather than a mathematical postulate, researchers offer a new perspective on how a real-valued quantum theory can be constructed.
Category: quantum physics
Spin-orbit torque hardware creates random keys and reveals unauthorized access attempts
The information exchanged by modern devices is typically protected by cryptographic techniques, approaches that convert readable data into scrambled, unreadable code that can only be deciphered by authorized parties or devices. To descramble encrypted data, devices or accounts need access to randomly generated cryptographic keys, unique, randomly generated sequences of binary code, letters or numbers that are essential for encrypting or decrypting data.
To detect cyberattacks, most traditional hardware security systems monitor the power consumption, electrical signals or other changes in devices. However, cyberattackers have devised effective techniques that sometimes allow them to bypass these systems’ defenses.
Researchers at Huazhong University of Science and Technology and Hubei University recently introduced a new hardware security system based on spin-orbit torque (SOC) devices, technologies that operate by leveraging both electrical charge and a quantum property known as electron spin.
Out-of-equilibrium cesium atoms reveal fractional Fermi seas, exposing new critical quantum phase
In a new study published in Physical Review Letters, a team from the Nägerl group, together with theory collaborator Alvise Bastianello from the CNRS and the Université Paris-Dauphine, demonstrates that highly unusual quantum states known as “fractional Fermi seas” can be quantum engineered.
By driving quantum particles—here, ultracold cesium atoms under one-dimensional confinement—far out of equilibrium through cyclic changes of the particle interaction, a novel critical phase of matter emerges, going beyond what is known from the celebrated Tomonaga-Luttinger liquid theory. The new publication serves as the theoretical companion to, and foundation for, recent experimental work in the group of Hanns-Christoph Nägerl at the Department of Experimental Physics.
Usually, particles in the quantum world follow strict rules about how they organize themselves at low temperatures. As Bastianello explains, “Fermions, for instance, stack neatly into the available energy states to form the so-called ‘Fermi sea.’ But what happens if one forces interacting atoms to continuously cycle through extreme conditions, smoothly shifting them from strongly repelling each other to strongly attracting each other?”
How to train your magnet: Excitons as a new knob for magnetic control
Scientists can learn a lot about a quantum material by watching how it responds to light. In magnetic semiconductors, one especially useful messenger is the exciton: a pairing of a negatively charged electron and the positively charged “hole” it leaves behind. Until now, excitons in magnetic materials have mostly been used as reporters. They could reveal how spins were arranged or how magnetic waves moved through a material. But Cornell researchers have shown that excitons can do more than observe magnetism. They can actively steer it.
In the paper “Excitonic Spin Torque in a Magnetic Semiconductor,” published June 15 in Nature Materials, Youn Jue (Eunice) Bae, assistant professor of chemistry and chemical biology in the College of Arts and Sciences, and colleagues report that excitons created by light can exert a spin torque in the two-dimensional magnetic semiconductor chromium sulfide bromide, or CrSBr. The finding establishes excitons as a new way to control magnetic motion with light.
“Excitons have been very useful for watching what spins are doing in magnetic materials,” Bae said. “What we show here is that excitons can also act back on the spins. They are not just spectators; they can help drive the magnetic motion.”
The Physics of FTL Travel
Can humanity ever travel faster than light, or does every shortcut through spacetime break causality itself? We explore warp drives, wormholes, tachyons, and why the universe pushes back.
Get Nebula using my link for 50% off an annual subscription: https://go.nebula.tv/isaacarthur.
Watch my exclusive video Nearby Supernovae: https://nebula.tv/videos/isaacarthur–… SFIA Merchandise: https://isaac-arthur-shop.fourthwall… 🌐 Visit our Website: http://www.isaacarthur.net ❤️ Support us on Patreon: / isaacarthur ⭐ Support us on Subscribestar: https://www.subscribestar.com/isaac-a… 👥 Facebook Group:
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/ discord Credits: The Physics of FTL Travel Written, Produced & Narrated by: Isaac Arthur Editor: Lukas Konecny Music Courtesy of Stellardrone & Chris Zabriskie Select imagery/video supplied by Getty Images Chapters 0:00 Intro 0:12 Faster Than Light Is the Wrong Question 4:18 Spacetime Engineering: Moving the Map Instead of the Ship 5:24 Warp Drives: Surfing Spacetime 11:46 Wormholes: Shortcuts with a Side of Time Travel 13:20 Hyperspace: Shortcuts Through the Bulk 15:11 Solitons: The Positive Energy Challenge 17:35 The Krasnikov Tube: Building a Star-Road 20:30 Natural Relativistic Loopholes: Cosmic Strings and Tipler Cylinders 25:05 Tachyons: The Simplest Way to Break Time 28:04 Vacuum & Time-Advance Effects: When Causality Bends, Just a Little 32:19 Quantum Red Herrings 35:42 Nebula 36:54 Why the Universe Pushes Back: Chronology Protection and Self-Defeating Physics.
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🌐 Visit our Website: http://www.isaacarthur.net.
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Credits:
The Physics of FTL Travel.
Written, Produced \& Narrated by: Isaac Arthur.
Editor: Lukas Konecny.
Music Courtesy of Stellardrone \& Chris Zabriskie.
Select imagery/video supplied by Getty Images.
Chapters.
0:00 Intro.
0:12 Faster Than Light Is the Wrong Question.
4:18 Spacetime Engineering: Moving the Map Instead of the Ship.
5:24 Warp Drives: Surfing Spacetime.
11:46 Wormholes: Shortcuts with a Side of Time Travel.
13:20 Hyperspace: Shortcuts Through the Bulk.
15:11 Solitons: The Positive Energy Challenge.
17:35 The Krasnikov Tube: Building a Star-Road.
20:30 Natural Relativistic Loopholes: Cosmic Strings and Tipler Cylinders.
25:05 Tachyons: The Simplest Way to Break Time.
28:04 Vacuum \& Time-Advance Effects: When Causality Bends, Just a Little.
32:19 Quantum Red Herrings.
35:42 Nebula.
36:54 Why the Universe Pushes Back: Chronology Protection and Self-Defeating Physics.
AI Development Highlights To Watch-Out For In 2025 & Beyond
~ AI supremacy & digital empires.
There is something critical taking place in the world now.
It has something to do with the neurological response system of humans.
Basically, when something happens, our sensory/nervous system processes it and guides us in the best way to respond.
That system is being blunted to death in everyone living in today’s world.
We have become so stimulated by numerous technological, socioeconomic and geopolitical shocks, that, we are almost in a helpless trance-like state now (the usual rounds of life).
We can only just watch as the world unfolds into a dystopian singularity before our eyes— wars & conflicts, natural disasters, alien disclosures, unending AI updates now laced with political & economic tensions, World Cup & UFC fevers, Stock Market volatility etc… etc…
The Man Who Proved We Can’t Control AI (And What That Means for Humanity) | Roman Yampolskiy
Dr. Roman Yampolskiy joins me to explore one of the most urgent and uncomfortable questions of our time: what happens when we create intelligence that surpasses our own? We unpack the difference between the AI tools we use today and the emergence of artificial general intelligence, and why the transition from narrow systems to self-improving intelligence may mark a point where human control is no longer possible. Roman shares why even the people building these systems do not fully understand how they work, and why that gap in understanding becomes exponentially more dangerous as capabilities increase.
In this conversation, we explore the limits of control, prediction, and safety in a world where intelligence can recursively improve itself beyond human comprehension. Roman lays out why the problem of AI alignment may be fundamentally unsolvable, what timelines experts are realistically considering, and why even a single mistake at that level could have irreversible consequences. This episode invites a deeper reflection on what we are creating, what we assume we can control, and whether humanity is prepared for the intelligence it is bringing into existence.
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André’s Book Recs: https://www.knowthyselfpodcast.com/bo… 00:00 Intro 01:25 What Is AGI and Why Should We Be Scared? 05:17 Roman’s Journey: From Optimism to Impossibility 09:07 The High Risk, Zero Reward Equation 13:01 Why Superintelligence Is Uncontrollable, Unexplainable, and Unverifiable 18:00 How Long Do We Have? The AGI Timeline 21:24 How Superintelligence Could Actually Kill Us 23:28 Are We Living in a Simulation? 28:21 Can AI Become Conscious? 31:28 Ad: BiOptimizers 32:41 The Possible Timelines: Terminator, the Matrix, or the Zoo 42:24 I-Risk, X-Risk, and S-Risk: Three Ways It Goes Wrong 46:31 The Human Meaning Crisis: Jobs, Purpose, and What’s Left 49:02 Ad: Based Bodyworks 50:20 What Empowers Us as Individuals Right Now 59:37 The Race to Doom: Who’s Building It and Why They Won’t Stop 1:07:41 Can AI Be Conscious — and Does It Already Have Internal Experiences? 1:12:41 Hacking the Simulation: Quantum, DMT, and Escaping the Code 1:18:30 Simulation Theory, Religion, and the Same Ancient Map 1:29:34 The Deal Roman Would Offer Altman, Dario, and Elon 1:39:44 What Is Humor? A Computer Scientist’s Theory 1:43:03 What Comes After: Singularity, Death, and Knowing Thyself ___________ Episode Resources: https://www.romanyampolskiy.com/ https://www.amazon.com/Unexplainable-?tag=lifeboatfound-20… / andreduqum
/ knowthyself
/ @knowthyselfpodcast https://www.knowthyselfpodcast.com Listen to the show: Spotify: https://spoti.fi/4bZMq9l Apple: https://apple.co/4iATICX
___________ 00:00 Intro 01:25 What Is AGI and Why Should We Be Scared? 05:17 Roman’s Journey: From Optimism to Impossibility 09:07 The High Risk, Zero Reward Equation 13:01 Why Superintelligence Is Uncontrollable, Unexplainable, and Unverifiable 18:00 How Long Do We Have? The AGI Timeline 21:24 How Superintelligence Could Actually Kill Us 23:28 Are We Living in a Simulation? 28:21 Can AI Become Conscious? 31:28 Ad: BiOptimizers 32:41 The Possible Timelines: Terminator, the Matrix, or the Zoo 42:24 I-Risk, X-Risk, and S-Risk: Three Ways It Goes Wrong 46:31 The Human Meaning Crisis: Jobs, Purpose, and What’s Left 49:02 Ad: Based Bodyworks 50:20 What Empowers Us as Individuals Right Now 59:37 The Race to Doom: Who’s Building It and Why They Won’t Stop 1:07:41 Can AI Be Conscious — and Does It Already Have Internal Experiences? 1:12:41 Hacking the Simulation: Quantum, DMT, and Escaping the Code 1:18:30 Simulation Theory, Religion, and the Same Ancient Map 1:29:34 The Deal Roman Would Offer Altman, Dario, and Elon 1:39:44 What Is Humor? A Computer Scientist’s Theory 1:43:03 What Comes After: Singularity, Death, and Knowing Thyself ___________.
Quantum Hall effect gains a new twist in graphene moiré systems
Physicists have long been drawn to the nonlinear Hall effect: a subtle variant of the classical Hall effect, in which an electric voltage appears perpendicular to a current flowing through a material. Unlike its classical counterpart, the nonlinear version can arise even without breaking time-reversal symmetry, and its magnitude is tied to deep geometric properties of electron wave functions. So far, however, the behavior of the effect when a magnetic field is applied has remained poorly understood.
Through new research published in Physical Review Letters, a team led by Jinrui Zhong at the Beijing Institute of Technology has shed new light on this question—leading them to discover an entirely new class of quantum oscillation.