2024/03/30 by Sang-Bae Kim, J. Stöhr, Kim, Sangbae +5
Computer Science · Medicine · Physics and Astronomy · #Advanced Optical Sensing Technologies #FOS: Physical sciences #Ocular and Laser Science Research #Quantum Information and Cryptography #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2404.00496
openalex publication_date 2024/03/30 · openalex created_date 2024/04/04 · openalex updated_date 2026/07/28
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/√(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.