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Researchers Demonstrate Fundamental Space-Time Limit for Electrons, Advancing Future Electronic Devices

Researchers Demonstrate Fundamental Space-Time Limit for Electrons, Advancing Future Electronic Devices

An international team of researchers has experimentally demonstrated a fundamental limit to the precision with which an electron’s position and the time of its motion can be simultaneously determined. This work, involving groups from the Regensburg Center for Ultrafast Nanoscopy and the Max Planck Institute, utilized a laser system with high temporal resolution. In the experiment, electrons were directed from an ultrasharp metal tip to a silver surface, with their motion recorded through electric current and transfer time measured using two light pulses. The electrons exhibited quantum tunneling, behaving as quantum waves, with motion observed on attosecond timescales. Quantum simulations confirmed the experimental results, showing electrons responded to the light field with a delay of approximately 500 attoseconds. The study also revealed that increased precision in determining an electron's motion time requires more energy, causing the electron's wave packet to stretch spatially.

RIT Students and Professor Achieve Breakthrough in Laser Fabrication of Freeform Optics

RIT Students and Professor Achieve Breakthrough in Laser Fabrication of Freeform Optics

Students and Associate Professor Jie Qiao at the Rochester Institute of Technology (RIT) have successfully developed a method for deterministically figuring and finishing freeform optical surfaces using a femtosecond laser. This breakthrough, detailed in Optics Express with Muhammed Akif Qadeer as lead author and Noah Sanderson as second author, stems from over a decade of research into how ultrashort laser pulses can precisely shape and smooth semiconductor and optical materials. The new noncontact process eliminates the need for a separate polishing step, potentially revolutionizing the manufacturing of advanced optical components. Freeform optics are crucial for applications in augmented and virtual reality, space telescopes, vehicle headlights, and medical equipment. Professor Qiao's patented technology has already been licensed to industry, indicating its commercial viability and impact.

Researchers Generate Spatiotemporal Optical Coils with Controllable Transverse Intensity Chirality

Researchers Generate Spatiotemporal Optical Coils with Controllable Transverse Intensity Chirality

Researchers have successfully generated spatiotemporal optical coils (STOCs) that exhibit controllable transverse intensity chirality. This new form of structured light is created by the non-collinear collision of two spatiotemporal optical vortices (STOVs). Unlike conventional optical chirality, which relies on polarization or phase, the chirality in these STOCs is directly embedded within the intensity distribution of the light field. When two STOV beams intersect at a specific propagation angle, they produce a coil-like structure where the trajectory of secondary vortices forms a three-dimensional helix. The number of helical arms in the STOC is determined by the difference in topological charges of the colliding STOVs, while the coil's pitch is influenced by both the collision angle and the topological charge difference. This phenomenon allows for the creation of multi-arm spirals, such as double helices or six-arm helices, depending on the input STOV parameters. The research highlights that the energy...

CERN LHCb Collaboration Captures Evidence of Ultra-Rare B Meson Decay

CERN LHCb Collaboration Captures Evidence of Ultra-Rare B Meson Decay

Physicists at the European Organization for Nuclear Research (CERN) have captured evidence of an extremely rare particle decay, specifically the decay of a 'Bd meson' into a 'muon' and an 'anti-muon'. This event is predicted to occur only once in 10 billion instances. The international Large Hadron Collider beauty (LHCb) collaboration announced this finding on November 3rd, with the research paper submitted to the international journal 'Physical Review X' after being posted on the preprint server 'arXiv' on October 30th. While this observation does not indicate new physics, it aligns with the predictions of the Standard Model of particle physics. The LHCb collaboration utilized data collected in 2024–2025, following an upgrade in 2022 that significantly increased the detector's data collection capacity. Machine learning was employed to analyze vast amounts of proton collision data to identify these rare decay candidates. The statistical significance of the Bd meson decay evidence is 3 sigma, increasing to ...

Researchers Demonstrate Fundamental Space-Time Limit for Electrons

Researchers Demonstrate Fundamental Space-Time Limit for Electrons

An international team of researchers has experimentally confirmed a fundamental limit on the simultaneous precision with which an electron's position and the time of its motion can be determined. This work, involving groups from the Regensburg Center for Ultrafast Nanoscopy and the Max Planck Institute in Hamburg, utilized a laser system with high temporal resolution. In their experiment, precisely synchronized laser pulses directed electrons from an ultrasharp metal tip towards a silver surface, separated by several atomic diameters. The electron motion was recorded via electric current, and the transfer time was measured using two light pulses with a controlled interval. The electrons traversed an energy barrier through quantum tunneling, behaving as quantum waves. Measurements revealed motion on attosecond timescales, with electrons responding to the light field with a delay of approximately 500 attoseconds. The study also found that increasing the precision of time determination required more energy, c...

International Researchers Create Room-Temperature Quantum State, Advancing Practical Quantum Technology

International Researchers Create Room-Temperature Quantum State, Advancing Practical Quantum Technology

An international team of researchers has successfully engineered an exotic quantum state of matter that operates at room temperature, a significant departure from the extreme cooling typically required for such states. This breakthrough, detailed in Science Advances, involved creating a supersolid in an exciton-polariton Bose-Einstein condensate using a microcavity, a light-trapping structure. The setup is noted for its relative inexpensiveness and voltage controllability, capable of functioning at temperatures up to 60 °C (140 °F). This quantum state, which exhibits properties of both a superfluid and a solid with a crystal-like structure, was observed for fractions of a second, sufficient for the necessary observations. The research points towards more practical applications of quantum technology in advanced computing systems and sensors by simplifying the study of quantum behavior in superfluids and supersolids.

Research Explores Nonlinear Propagation and Attenuation of Laser Beams in Plasma

Research Explores Nonlinear Propagation and Attenuation of Laser Beams in Plasma

A recent study investigates the nonlinear propagation and attenuation dynamics of finite Airy–Gaussian (AiG) laser beams within a non-relativistic, isotropic collisionless plasma that features an exponential density profile. The research employs the Wentzel–Kramers–Brillouin (WKB) approximation alongside the paraxial ray approximation. This methodology leads to a set of coupled differential equations that govern the transverse evolution of the beam's width. Numerical analysis conducted as part of the study indicates that the dimensionless adjustable density parameter significantly impacts the oscillatory behavior, self-focusing, defocusing, and attenuation characteristics of these AiG beams when interacting with non-uniform dense plasma. The findings suggest that a weaker plasma inhomogeneity can extend the propagation distance of the laser beams and alter the balance between defocusing and nonlinear self-focusing effects. This detailed examination provides insights into how laser beams behave in complex p...

IBM Unveils Quantum System Two in Illinois, Advancing State's Quantum Economy

IBM Unveils Quantum System Two in Illinois, Advancing State's Quantum Economy

IBM Unveils Quantum System Two in Illinois, Advancing State's Quantum Economy

Quantum Computing Inc. Reports Strong Third Quarter 2026 Financial Results Driven by Acquisitions

Quantum Computing Inc. Reports Strong Third Quarter 2026 Financial Results Driven by Acquisitions

Quantum Computing Inc. Reports Strong Third Quarter 2026 Financial Results Driven by Acquisitions

Physicist Ulf Leonhardt Manipulates Light to Explore Invisibility and Dark Energy

Physicist Ulf Leonhardt Manipulates Light to Explore Invisibility and Dark Energy

Professor Ulf Leonhardt, a physicist at the Weizmann Institute of Science, is conducting groundbreaking research into manipulating light to achieve invisibility and to better understand dark energy, one of the universe's greatest mysteries. Leonhardt's work builds on the theoretical concept of using metamaterials to bend light rays around an object, making it appear invisible. While full-scale invisibility cloaks for humans remain science fiction due to technological and cost limitations, experimental demonstrations have successfully concealed tiny objects and even events in time. Leonhardt is also applying insights from material physics to spacetime to address cosmological tensions, such as the 'Hubble tension' and the 'S8 tension,' and to explain how quantum vacuum fluctuations might produce dark energy.

Perimeter Institute Details Quantum Error Correction Breakthroughs Enabling Practical Quantum Computing

Perimeter Institute Details Quantum Error Correction Breakthroughs Enabling Practical Quantum Computing

The Perimeter Institute reports significant advancements in quantum error correction, moving quantum computing closer to practical application after three decades of incremental progress. Michele Mosca, a professor at the University of Waterloo’s Institute for Quantum Computing and a founding member of Perimeter, initially doubted the feasibility of quantum computing due to the inherent fragility of quantum systems and the difficulty of error correction. However, the emergence of viable error correction techniques marked a 'conceptual leap,' shifting the field from impossible to almost impossible. Unlike classical bits, qubits exist in a superposition of states, making them highly susceptible to environmental noise. Quantum error correction methods address this by detecting errors without directly observing the qubit's state, which would destroy its superposition. Researchers use the Bloch sphere to visualize qubit states and identify errors by recognizing shifts into different subspaces, rather than simpl...

Physicist Hongsheng Zhang's Research Suggests Time Travel to the Past is Impossible in Most Theoretical Universes

Physicist Hongsheng Zhang's Research Suggests Time Travel to the Past is Impossible in Most Theoretical Universes

Hongsheng Zhang, a physicist at the University of Jinan in China, has presented research indicating that traveling into one's own past is impossible in a broad class of theoretical universes. The core of his argument rests on the principle that in relativity, the direction of light can never be at right angles to an object's direction through time. This implies that anything moving slower or faster than light must traverse spacetime in a consistent direction, akin to climbing a staircase without the ability to descend. This research, which is currently awaiting peer review, suggests that the concept of 'closed timelike curves'—journeys through spacetime that loop back to their origin—are generally not feasible. Zhang's findings do not rely on exotic matter, quantum effects, or specific assumptions about the universe's composition, focusing instead on the fundamental directions within spacetime.