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Paper 1
Datacom-Agnostic Shortwave QKD for Short-Reach Links
Mariana Ferreira Ramos, Marie-Christine Slater, Michael Hentschel, Martin Achleitner, Hannes Hübel, Bernhard Schrenk
- Year
- 2023
- Journal
- arXiv preprint
- DOI
- arXiv:2311.17591
- arXiv
- 2311.17591
We investigate the co-existence of 852-nm and 1550-nm QKD with carrier-grade 4x25-Gb/s/$λ$ LANWDM over a short-reach interconnect. Shortwave QKD yields a higher key rate and is insensitive to Raman noise, as opposed to 1550-nm QKD.
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A Scalable Superconducting Circuit Framework for Emulating Physics in Hyperbolic Space
Xicheng Xu, Ahmed Adel Mahmoud, Noah Gorgichuk, Ronny Thomale, Steven Rayan, Matteo Mariantoni
- Year
- 2025
- Journal
- arXiv preprint
- DOI
- arXiv:2510.23827
- arXiv
- 2510.23827
Theoretical studies and experiments in the last six years have revealed the potential for novel behaviours and functionalities in device physics through the synthetic engineering of negatively-curved spaces. For instance, recent developments in hyperbolic band theory have unveiled the emergence of higher-dimensional eigenstates -- features fundamentally absent in conventional Euclidean systems. At the same time, superconducting quantum circuits have emerged as a leading platform for quantum analogue emulations and digital simulations in scalable architectures. Here, we introduce a scalable superconducting circuit framework for the analogue quantum emulation of tight-binding models on hyperbolic and kagome-like lattices. Using this approach, we experimentally realize three distinct lattices, including, for the first time to our knowledge, a hyperbolic lattice whose unit cell resides on a genus-3 Riemann surface. Our method encodes the hyperbolic metric directly into capacitive couplings between high-quality superconducting resonators, enabling tenable reproduction of spectral and localization properties while overcoming major scalability and spectral resolution limitations of previous designs. These results set the stage for large-scale experimental studies of hyperbolic materials in condensed matter physics and lay the groundwork for realizing hyperbolic quantum processors, with potential implications for both fundamental physics and quantum computing
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