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Quantum Breakthrough: Scientists Create Device to Measure Ampere, Volt and Ohm in One System Introduction Scientists have unveiled a revolutionary quantum-based device capable of accurately recording all three fundamental electrical units: the ampere (current), the volt (potential) and the ohm (resistance). Unit now, no instrument could perform these three precise measurements within a single system. This innovation marks a historic milestone in metrology, opening new possibilities for precision engineering and minimizing human error in electrical measurements. How the Device Works Bringing Two Quantum Systems Together Jason Underwood and his team at the National Institute of Standards and Technology (NIST) in Maryland demonstrated the feasibility of this device by combining two critical quantum systems inside one cryostat : The Quantum Anomalous Hall Resistor (QAHR) The Programmable Josephson Voltage Standard (PJVS) The cryostat plays a vital role by maintaining ultra-low temper...

Long-Lived Schrodinger's Cat State Reaches Heisenberg-Limited Precision Introduction Researchers from the University of Science and Technology of China (USTC), directed by Prof. Lu Zhengtian and Researcher Xia Tian, achieved a Schr ö dinger-cat state with a minute-scale lifetime through optically tra p ped cold atoms. The study , enhancing quantum metrology sensitivity, a p peared in Nature Photonics . The Role of Particle S pin in Quantum Metrology Quantum Metrology and Magnetic Field Detection Particle s pin  plays a crucial role in quantum metrology, serving as an effective  probe for detecting magnetic fields, inertial effects, and diverse  physical  phenomena, while also enabling ex ploration of  physics beyond the Standard Model. High-Spin  Schr ö dinger -Cat State The high-s pin  Schr ö dinger -Cat state, characterized by a su per position of two maximally se parated s pin states, enhances s pin measurement ca pabilities. The high s pin quantum ...