Prior efforts focused on single-photon entangled states that improved precision but were limited for resolving interference patterns in high-resolution applications. The multi-mode N00N state used by KIST researchers involved several photons entangled across specific paths, producing denser interference fringes and enabling fine detection of changes. This approach brought experimental results near the Heisenberg limit for quantum precision.
The KIST team constructed a two-photon multi-mode N00N state encompassing four path modes, successfully measuring two distinct phase parameters at once. Their experiments achieved approximately 88% greater precision-a 2.74 dB improvement-over conventional methods.
The advancement opens possibilities for fields requiring precise measurements, such as biological imaging, semiconductor diagnostics, and space observations. It may lead to improved detection of subcellular microstructures, nanometer-scale defects in circuits, and sharper views of distant astronomical phenomena.
"This achievement marks an important milestone, demonstrating the potential of practical quantum sensor networks based on quantum entanglement technology," said Dr. Hyang-Tag Lim of KIST. "In the future, when combined with silicon-photonics-based quantum chip technology, it could be applied to a wide range of everyday applications."
Research Report:Distributed quantum sensing with multi-mode N00N states
Related Links
Korea Institute of Science and Technology
Understanding Time and Space
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