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Secure Quantum Metasurfaces for Direct Quantum Key Distribution Measurements — arXiv:2609.22946

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.22946
License (as archived): CC0-1.0
Archived: 2026-10-09T22:46:34.009Z
SHA-256 of the archived text: 635580705efb3a6b48821712030d3b17fd70ec67f46c245a8bf98383ce8ef81f
Stable URL of this page: https://metraipolis.com/documento/dc_db1f8b2bc024

How to cite

Secure Quantum Metasurfaces for Direct Quantum Key Distribution Measurements — arXiv:2609.22946 — arXiv (en), https://arxiv.org/abs/2609.22946 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_db1f8b2bc024 (Metraipolis archive dc_db1f8b2bc024, sha256 635580705efb3a6b48821712030d3b17fd70ec67f46c245a8bf98383ce8ef81f)

BibTeX

@misc{dcdb1f8b2bc024,
  title = {Secure Quantum Metasurfaces for Direct Quantum Key Distribution Measurements — arXiv:2609.22946},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.22946},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_db1f8b2bc024; sha256 635580705efb3a6b48821712030d3b17fd70ec67f46c245a8bf98383ce8ef81f},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.22946. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Quantum key distribution (QKD) can deliver information-theoretic security, but its receivers are still typically assembled from cascaded bulk optics. Metasurfaces offer a radical reduction in this complexity. Here, we make the metasurface function as the QKD measurement device itself. We design wavelength-specific dielectric apertures at 780, 1550, 2000, and 10 600 nm that interweave the linear H/V and circular R/L phase libraries at a 0.44--0.49{\lambda} cell pitch, i.e., below half the operating wavelength, and map the complete passive-BB84 measurement directly onto four detector channels. This subwavelength basis co-location prevents an ordinary propagating-wave aperture mask from isolating one basis without simultaneously attenuating or perturbing the other. Simulated full-wave focal-plane intensities are converted directly into conditional Born probabilities using fitted, calibration-fixed detector regions. The selected designs achieve probability fidelities of 97.96--99.08%, four-port collected efficiencies of 17.43--40.94%, and mean intrinsic quantum bit error rates of 1.42--3.96%. At 1550 nm, the selected design gives an asymptotic device-level yield of 0.151 secret bits per incident photon under an ideal single-photon model. Six-state detector tomography gives positive both-basis security bounds for all six reconstructed receiver models, including their polarization-dependent loss, basis imbalance and crosstalk. These results establish protocol-matched meta-optics as a route to compact, passive QKD receivers.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-22 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph) ; Optics (physics.optics).
Pagina del lavoro: https://arxiv.org/abs/2609.22946 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-09T22:25:52.334Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-09-22?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).