PreprintarXiv licencearXiv
Post-selected enhancement of phase sensitivity in a two-path interferometer
Abstract
Post-selected metrology can exceed the standard quantum limit of single photon interference by concentrating all of the available Fisher information in a subset of post-selected outcomes. Here we apply this principle to a standard two-path interferometer, activating the Fisher information concentrated in the low probability output port by transferring the phase sensitivity to the circular polarizations of the photon. We obtain a phase gradient of the post-selected interference fringe that corresponds to that of a four-photon NOON state, providing a direct comparison of the performance of multi-photon interference with single-photon post-selection.
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BibTeX
@misc{fukuda2026postselected,
title = {{Post-selected enhancement of phase sensitivity in a two-path interferometer}},
author = {Ryuya Fukuda and Katsuki Tanaka and Masataka Iinuma and Holger F. Hofmann},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.25673},
eprint = {2609.25673},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.25673},
}
RIS
TY - UNPB
TI - Post-selected enhancement of phase sensitivity in a two-path interferometer
AU - Ryuya Fukuda
AU - Katsuki Tanaka
AU - Masataka Iinuma
AU - Holger F. Hofmann
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.25673
UR - https://arxiv.org/abs/2609.25673
AB - Post-selected metrology can exceed the standard quantum limit of single photon interference by concentrating all of the available Fisher information in a subset of post-selected outcomes. Here we apply this principle to a standard two-path interferometer, activating the Fisher information concentrated in the low probability output port by transferring the phase sensitivity to the circular polarizations of the photon. We obtain a phase gradient of the post-selected interference fringe that corresponds to that of a four-photon NOON state, providing a direct comparison of the performance of multi-photon interference with single-photon post-selection.
ER -