Author

Masahito Hayashi

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Preprint Oct 2026

From Symmetry to Secrecy: Covariant Classical--Quantum Wiretap Channels

For classical--quantum wiretap channels with a transitive covariant input action, both output ensembles admit a description as unitary group orbits of fixed seed states. We use this structure to construct finite-block preprocessing schemes whose private information is an entropy difference evaluated at two distribution...

Masahito Hayashi, Farzin Salek · 0 citations

Preprint Aug 2026

Robust CHSH Self-Testing with Finite-Energy GKP States

We present a full-oscillator analysis of a finite-energy GKP CHSH test whose observed score yields robust Bell-pair self-testing. Periodically binned position and momentum give the Pauli settings, while a fixed binary coarse-graining of photon number modulo four and its displaced conjugate realize the tilted settings....

Farzin Salek, Masahito Hayashi · 2 citations