Quantum networking technologies - National Cyber Security Centre

Quantum state tomography revealed a breakdown of the superposition principle within a superconducting qubit, challenging a core tenet of quantum theory, according to research from Washington University and the University of California, Berkeley. Orion Lee, Qian Cao and colleagues theoretically characterized and experimentally investigated this deviation from linearity in a dissipative superconducting transmon circuit, finding that “linearity is a foundational property of quantum dynamics.” Their work demonstrates that no-jump postselection generates an anti-Hermitian nonlinearity, causing a measurable non-linear response in the qubit’s evolution and a violation of linearity quantified across the exceptional-point degeneracy of the non-Hermitian Hamiltonian. This postselection, which focuses on trajectories where the qubit does not “jump” to a lower energy state, effectively reshapes the system’s dynamics, leading to a deviation from the standard linear behavior expected in quantum mechanics.

In this episode of Motley Fool Hidden Gems Investing, Motley Fool contributors Travis Hoium and Lou Whiteman and Motley Fool analyst Jason Moser debate:The future of smart homes, flying cars, and AI wearables. Whether big tech's latest innovations can move the needle. The sharp sell-off in AI infrastructure stocks. The financial pressures facing the AI industry. Stocks on the radar. To catch full episodes of all The Motley Fool's free podcasts, check out our podcast center. When you're ready to invest, check out this top 10 list of stocks to buy. A full transcript is below. This podcast was recorded on Oct. 16, 2026. Travis Hoium: Flying cars are finally here, and Motley Fool Hidden Gems Investing starts now. Welcome to Motley Fool Hidden Gems Investing. I'm Travis Hoium. I'm joined today by Lou Whiteman and Jason Moser. Guys, we got a couple of big product announcements, with Apple releasing the HomeView, and we have a new Roadster, or at least we're in 2028 from Tesla, that can fly. I want you guys' thoughts on this, but the context that I want this in is our history with technology.

After a full season of daily carry and trail use, the Leatherman Wave Alpha with MagnaCut is our favorite for everyday carry Using the Leatherman Wave Alpha to add sealant to a mountain bike tire. Courtesy Chris Meehan

The PlayStation 5 Pro has several accessories for anyone who wants to complement the experience with their console, especially headsets and charging docks for controllers. In addition to products made by Sony itself, there are other PlayStation accessory brands that offer good alternatives. However, despite the variety, not all of them make sense for players, since they do not add much value. That happens because not every accessory actually solves a problem you may have or augments your experience while gaming. Some promise to improve the console's cooling, while other accessories are intended to add new functions. Depending on the product, you may also run into durability or comfort problems, causing a purchase that seemed useful to be set aside after some time.

In the classical Universe, the arrow of time flies one way – but in the quantum realm, where classical physics breaks down, could even time's direction be ripe for the tweaking? The ability to manipulate the direction of quantum evolution could offer new ways to process information – with implications especially for quantum computing. And it may be within reach. Korean physicists have demonstrated a qubit whose processes can be run backward in time… and the deliciously ironic twist is that they had to go back in time to find it. In a new preprint, physicist Tai Hyun Yoon of Korea University developed a theory describing what he calls a quantum vacuum-seeded single-photon time qubit – and showed that an experiment he and colleagues conducted in 2018 for an entirely different purpose had inadvertently already shown it in action. The notion of a time qubit is a relatively recent one, arising in a preprint penned by physicist Yakov Bloch of Tel Aviv University, uploaded to arXiv in November 2025. It's not actually a qubit that can travel backward in time; rather, as Bloch explains it, it's a quantum system that can evolve in two opposite temporal directions at once.