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Reducing of the Uncertainty Product of Coherent Light through Multi-Photon Interference

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posted on 2024-04-01, 06:48 authored by Joachim Stohr, S. Kim, Fabian Rotermund, Byoung Ham
We demonstrate theoretically and experimentally how the diffraction and interferometric resolution limit for single-mode coherent cw laser light can be overcome by multi-photon interference. By use of a Mach-Zehnder interferometer, operated in the single input and single or double output port geometries, we observe a fringe width reduction of the conventional interference pattern, predicted by the wave or single photon quantum theory, by a factor of up to $1/\sqrt{2N}$ through coincident detection of N=2,3,4 photons. Our scheme does not require squeezed or entangled light to overcome the standard quantum limit and greatly facilitates precision interferometry experiments.

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Funder Name

Ministry of Science and ICT (IITP 2024-2021-0-01810)

Preprint ID

112316

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