2026
He, Yan; Dada, Adetunmise Charles
Secure Quantum Metasurfaces for Direct Quantum Key Distribution Measurements Journal Article
In: arXiv preprint arXiv:2609.22946, 2026.
Abstract | Links | BibTeX | Tags: Metasurface, POVMs, Quantum Measurements, Quantum optics
@article{He2026Secure,
title = {Secure Quantum Metasurfaces for Direct Quantum Key Distribution Measurements},
author = {Yan He and Adetunmise Charles Dada},
url = {https://arxiv.org/abs/2609.22946},
doi = {10.48550/arXiv.2609.22946},
year = {2026},
date = {2026-09-19},
journal = {arXiv preprint arXiv:2609.22946},
abstract = {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--0.49λ 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.},
keywords = {Metasurface, POVMs, Quantum Measurements, Quantum optics},
pubstate = {published},
tppubtype = {article}
}
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--0.49λ 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.
2011
Dada, Adetunmise Charles; Andersson, Erika; Jones, Martin L.; Kendon, Vivien M.; Everitt, Mark S.
Quantum measurements of atoms using cavity QED Journal Article
In: Phys. Rev. A, vol. 83, iss. 4, pp. 042339, 2011.
Links | BibTeX | Tags: Atoms, Cavity QED, Generalised measurements, POVMs, Quantum Measurements
@article{PhysRevA.83.042339,
title = {Quantum measurements of atoms using cavity QED},
author = {Adetunmise Charles Dada and Erika Andersson and Martin L. Jones and Vivien M. Kendon and Mark S. Everitt},
url = {https://link.aps.org/doi/10.1103/PhysRevA.83.042339},
doi = {10.1103/PhysRevA.83.042339},
year = {2011},
date = {2011-04-01},
journal = {Phys. Rev. A},
volume = {83},
issue = {4},
pages = {042339},
keywords = {Atoms, Cavity QED, Generalised measurements, POVMs, Quantum Measurements},
pubstate = {published},
tppubtype = {article}
}