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arXiv · 2507.00679

Certifying semi-device-independent security via wave-particle duality experiments

Chithra Raj·Tushita Prasad·Anubhav Chaturvedi·Lucas Pollyceno·Daniel Spegel-Lexne·Santiago Gómez·Joakim Argillander·Alvaro Alarcón·Guilherme B. Xavier·Marcin Pawłowski·Pedro R. Dieguez
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Abstract

Wave-particle duality is known to be equivalent to an entropic uncertainty relation based on the min- and max-entropies, which have a clear operational meaning in quantum cryptography. Here, we derive a connection between wave-particle relations and the semi-device-independent (SDI) security framework. In particular, we express an SDI witness entirely in terms of two complementary interferometric quantities: visibility and input distinguishability. Applying a symmetry condition to the interferometric quantities, we identify a scenario in which the classical bound is violated and the security condition is met in wave-particle experiments with a tunable beam splitter. This enables the certification of non-classicality and the positivity of the key rate directly from complementary interferometric quantities. Moreover, we perform a proof-of-principle experiment using orbital-angular-momentum encoded quantum states of light in a tunable interferometer, validating our theoretical predictions. Finally, we analyze an improved bound on the SDI security condition, effectively enlarging the parameter region where secure communication can be certified.

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Chithra Raj, Tushita Prasad, Anubhav Chaturvedi, Lucas Pollyceno, Daniel Spegel-Lexne, Santiago Gómez, Joakim Argillander, Alvaro Alarcón, Guilherme B. Xavier, Marcin Pawłowski, Pedro R. Dieguez. 2025-07-01. Certifying semi-device-independent security via wave-particle duality experiments. https://arxiv.org/abs/2507.00679

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