Experiment conducted by Raman Research Institute, part of India's Department of Science and Technology.
Quantum measure observed: 1.17 (predicted ~1.18).
Technique used an event‑filter to choose photon histories and then erase distinguishing information.
Result separates quantum measure from ordinary probability, showing values above one are possible.
Implications for developing advanced quantum measurement methods and quantum computers.
The measurement involved directing photons through multiple paths and using an event‑filter to select and then erase path information, allowing interference.
The finding demonstrates that quantum measure can exceed the traditional probability limit and may provide new tools for quantum measurement and computing.
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