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This research demonstrates a breakthrough in quantum sensing by using adapted Hong-Ou-Mandel interferometry to measure time delays with 20-attosecond precision. By extracting information from spectral interference fringes of entangled photon pairs, the team surpasses conventional limits imposed by photon coherence without requiring calibration scanning. This advancement paves the way for deploying ultra-high-resolution quantum-limited measurements in practical sensing applications.
20 Attosecond Delays Show Quantum Behavior Beyond Photon Coherence Limit
Researchers utilized Hong–Ou–Mandel interferometry to measure delays beyond the typical photon coherence limit, achieving single-measurement path-delay sensing with attosecond precision.
Yingwen Zhang and colleagues from the University of Ottawa and the National Research Council of Canada have measured time delays as short as 20 attoseconds, demonstrating quantum behavior occurring beyond the traditional limits of photon coherence. The research team utilized a novel application of Hong-Ou-Mandel interferometry, adapting the technique to achieve spectrally resolved measurements at these extremely short timescales. By extracting delay information from the spectral interference fringes of entangled photon pairs, they surpassed the conventional dynamic range limited by photon coherence by over two orders of…
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