quantum physics

Researchers at Tokyo Tech identify the quantum critical point in superconductors, solving a three-decade-old mystery and enhancing the understanding of superconductivity fluctuations. Credit: SciTechDaily.comThermoelectric effect reveals full picture of fluctuations in superconductivity.Weak fluctuations in superconductivity, a precursor phenomenon to superconductivity, have been successfully detected by a research group at Tokyo Institute of Technology (Tokyo Tech). This breakthrough was achieved by measuring the…

A schematic representation of quantum interference of the topological motion of electrons along the symmetry-allowed sample hinges. Credit: Shafayat Hossain, postdoctoral research associate in the Zahid Hasan group at Princeton UniversityNew research expands opportunities for advancements in quantum physics and spintronics.In a novel experiment, physicists have observed long-range quantum coherence effects due to Aharonov-Bohm interference in a topological insulator-based device. This finding opens up a new realm of…

Visualization of locating the optimal generator on a Bloch sphere. The color represents the QFI for the given generator. CreditSteven Burrows/Holland groupResearchers have revolutionized quantum sensing with an algorithm that simplifies the assessment of Quantum Fisher Information, thereby enhancing the precision and utility of quantum sensors in capturing minute phenomena.Quantum sensors help physicists understand the world better by measuring time passage, gravity fluctuations, and other effects at the tiniest scales.…

Hybrid integration of a designer nanodiamond with photonic circuits via ring resonators. CreditSteven Burrows/Sun GroupJILA breakthrough in integrating artificial atoms with photonic circuits advances quantum computing efficiency and scalability.In quantum information science, many particles can act as “bits,” from individual atoms to photons. At JILA, researchers utilize these bits as “qubits,” storing and processing quantum 1s or 0s through a unique system.While many JILA Fellows focus on qubits found in nature, such as…

LSU researchers have made a significant discovery related to the fundamental properties and behavior of plasmonic waves, which can lead ot the development of more sensitive and robust quantum technologies. Credit: LSUQuantum researchers uncover important implications for quantum technology.In a recent publication in Nature Physics, the LSU Quantum Photonics Group offers fresh insights into the fundamental traits of surface plasmons, challenging the existing understanding. Based on experimental and theoretical…

Researchers have developed a method to measure gravity at a microscopic level, marking a significant advancement in understanding quantum gravity. Credit: SciTechDaily.comPhysicists successfully measure gravity in the quantum world, detecting weak gravitational pull on a tiny particle with a new technique that uses levitating magnets, putting scientists closer to solving mysteries of the universe.Scientists are a step closer to unraveling the mysterious forces of the universe after working out how to measure gravity on a…

Researchers at Paderborn University have pioneered a method using photon detectors for homodyne detection to characterize optical quantum states accurately. This technique is vital for advancing quantum information processing and quantum computing. Credit: SciTechDaily.comScientists achieve breakthrough in quantum optics with photon detector-based method, paving the way for improved quantum computing.Scientists at Paderborn University have used a new method to determine the characteristics of optical, i.e. light-based,…

But there may be opportunities to indirectly spot the signatures of those gravitons.One strategy Vafa and his collaborators are pursuing draws on large-scale cosmological surveys that chart the distribution of galaxies and matter. In those distributions, there might be “small differences in clustering behavior,” Obied said, that would signal the presence of dark gravitons.When heavier dark gravitons decay, they produce a pair of lighter dark gravitons with a combined mass that is slightly less than that of their parent…

Researchers from São Paulo State University have developed a new method to quantify quantum entanglement, challenging traditional theories and potentially advancing quantum computing. This study emphasizes the importance of entanglement in enhancing processing power and offers insights into the limitations of classical computing, highlighting the rapid progress of quantum technology led by companies like Google and IBM.Entanglement is a fundamental principle in quantum physics and a critical factor for the effectiveness…

Researchers from the Stiller Research Group have significantly cooled sound waves in an optical fiber to a near quantum ground state, reducing thermal noise and potentially bridging classical and quantum mechanics. This breakthrough, achieved through laser cooling and stimulated Brillouin scattering, marks a promising step towards utilizing long acoustic phonons in quantum technologies. Artist’s impression of cooled acoustic waves in an optical fiber taper. Credit: Long Huy DaThe quantum ground state of an acoustic wave…