Detection-dependent six-photon NOON state interference
Rui-Bo Jin, Mikio Fujiwara, Ryosuke Shimizu, Robert J. Collins, Gerald, S. Buller, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Masahiro Takeoka, and Masahide Sasaki

TL;DR
This paper demonstrates six-photon NOON state interference over the full pattern range, revealing detection-dependent properties crucial for quantum sensing and imaging applications.
Contribution
It provides the first comprehensive exploration of the full NOON-SI pattern with six photons, highlighting detection scheme effects on interference properties.
Findings
Interference pattern shape depends on detection schemes
Coherence time varies with detection configuration
Visibility of interference is detection-dependent
Abstract
NOON state interference (NOON-SI) is a powerful tool to improve the phase sensing precision, and can play an important role in quantum sensing and quantum imaging. However, most of the previous NOON-SI experiments only investigated the center part of the interference pattern, while the full range of the NOON-SI pattern has not yet been well explored.In this Letter, we experimentally and theoretically demonstrate up to six-photon NOON-SI and study the properties of the interference patterns over the full range.The multi-photons were generated at a wavelength of 1584 nm from a PPKTP crystal in a parametric down conversion process.It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes.This experiment can be used for applications which are based on the envelope of the NOON-SI pattern, such as quantum…
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