# Indian Scientists Experimentally Validate Quantum Measure Exceeding One Researchers at Raman Research Institute confirm quantum histories can surpass classical probability limits. - **Source:** [Technology | The Indian Express](https://indianexpress.com) - **Published:** 2026-10-19 - **Topic:** [Data & AI](https://brifing.si/c/data-ai) - **Original article:** - **On Brifing:** https://brifing.si/s/e5f61047-113a-48f6-a483-deac59185a3d ## Experimental Breakthrough in Quantum Physics Scientists at the Raman Research Institute in Bengaluru have experimentally demonstrated that quantum measure can exceed one. This milestone confirms a long-standing theoretical concept regarding the paths quantum entities take. Led by Sanchari Chakraborti and Urbasi Sinha, the findings were published in the journal Quantum, marking a significant step in understanding quantum mechanics. ## Redefining Probability in Quantum Systems In classical physics, the probability of a particle taking a specific route cannot exceed one, or 100 percent. However, quantum measure acts as an analogue to probability that behaves differently due to particle interference. This study highlights how quantum entities defy everyday intuition by existing in multiple states simultaneously during their evolution. ## The Role of Quantum Histories Quantum mechanics is often described by a system's state at a specific time. Alternatively, this research focuses on possible histories, representing the various paths a photon takes from a laser to a detector. Quantum Measure Theory assigns a generalized measure to these history sets, incorporating the complex interference patterns that occur between them. ## Experimental Methodology and Results Assessing quantum measure is difficult because history sets do not always correspond to standard sequential measurements. The RRI team designed an ingenious experimental setup to isolate these pathways. They successfully recorded a quantum measure of 1.17, which aligns closely with their theoretical calculation of 1.18 under the specific conditions established for the experiment. ## Interference as a Driving Mechanism The phenomenon of a quantum measure exceeding one occurs because multiple pathways interfere with each other like overlapping waves. Just as wave crests combine to create a larger wave, the interference among these quantum paths leads to values greater than one. This confirms that quantum systems do not follow standard additive probability rules. ## Collaboration with Rafael Sorkin The study was conducted in collaboration with theoretical physicist Rafael Sorkin, who developed Quantum Measure Theory while researching quantum gravity. Sorkin, a researcher emeritus at Canada's Perimeter Institute, served as a visiting faculty member at RRI. His contribution remains central to this work, which was accepted for publication shortly before his death in September. ## Significance for Quantum Information Research Urbasi Sinha, leader of the Quantum Information and Computing laboratory at RRI, emphasized the personal and scientific importance of this paper. By providing the first experimental verification of this theory, the team has bridged a gap between abstract mathematical models and physical reality, potentially influencing future research in quantum gravity and information processing. ## Future Implications of Quantum Measures This experimental validation provides a foundation for further exploration into how quantum entities evolve between preparation and detection. By proving that quantum measures can surpass classical limits, researchers can now better analyze complex path histories. This work sets a new benchmark for experimental precision in the study of fundamental quantum phenomena and gravity. ## Sources covering this story - https://indianexpress.com/article/technology/science/indian-scientists-rri-quantum-measure-exceed-one-experiment-10927589/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._