Author

Masahiro Takeoka

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Preprint Sep 2026

Efficient Heralding of Loss-Tolerant Photonic GHZ States for Device-Independent Conference Key Agreement over Long Distances

Heralded multipartite entanglement distribution is a key requirement for device-independent conference key agreement (DI-CKA) over lossy quantum networks. Although locally equivalent in the absence of loss, different single-rail photon-number encodings of Greenberger-Horne-Zeilinger (GHZ) states can exhibit substantial...

Yazeed K. Alwehaibi, Makoto Ishihara, S. Daryanoosh et al. · 0 citations

Preprint Aug 2026

Fundamental limits of parameter estimation with heralded optical non-Gaussian states generated from Gaussian resources

Non-Gaussian states can exhibit large quantum Fisher information (QFI) in quantum sensing. In optical systems, however, its generation is often probabilistic via the boson-sampling type conditional operation and thus its generation rate is limited. This probabilistic generation of non-Gaussian resource should be taken...

Shohei Kiryu, Kazufumi Tanji, Y. Ueda et al. · 0 citations

Preprint Jul 2026

Information geometric quantification of effective privacy in quantum metrology

Privacy of a quantum metrological protocol concerns the extent to which single parameters can be kept inaccessible to an observer or to other users of the network. In this work, an information geometric framework is developed to quantify privacy and accessibility of functions of parameters effectively, that is, up to a...

Luca Bianchi, Shimpei Yamaguchi, W. Roga et al. · 1 citation