Polariton-polariton coherent coupling in a molecular spin-superconductor chip
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Quantum Physics arXiv:2602.18103 (quant-ph) [Submitted on 20 Feb 2026] Title:Polariton-polariton coherent coupling in a molecular spin-superconductor chip Authors:Carolina del Río (1), Marcos Rubín-Osanz (1), David Rodriguez (2), Sebastián Roca-Jerat (1), María Carmen Pallarés (1 and 3), J. Alejandro de Sousa (4), Paweł Pakulski (5), José Luis García Palacios (1), Daniel Granados (6), Dawid Pinkowicz (5), Núria Crivillers (4), Anabel Lostao (1 and 3 and 7), David Zueco (1), Alicia Gomez (2), Fernando Luis (1) ((1) Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Spain, (2) Centro de Astrobiología (CAB), CSIC-INTA, Torrejón de Ardoz, Spain, (3) Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, Spain, (4) Instituto de Ciencia de Materiales de Barcelona (ICMAB), CSIC, Barcelona, Spain, (5) Jagiellonian University, Faculty of Chemistry, Krakow, Poland, (6) IMDEA-Nanoscience, Madrid, Spain, (7) Fundación ARAID, Zaragoza, Spain) View a PDF of the paper titled Polariton-polariton coherent coupling in a molecular spin-superconductor chip, by Carolina del R\'io (1) and 37 other authors View PDF HTML (experimental) Abstract:The ability to establish coherent communication channels is key for scaling up quantum devices. Here, we engineer interactions between distant polaritons, hybrid spin-photon excitations formed at different lumped-element superconducting resonators within a chip. The chip consists of several resonator pairs, slightly detuned in frequency to make them addressable, capacitively coupled within each pair and inductively coupled to a common readout line. They interact locally with samples of PTMr and Tripak$^{-}$ organic free radicals, deposited onto their inductors, which provide model $S = 1/2$, $g \simeq 2$ spin ensembles. Frequency-dependent microwave transmission experiments, performed at very low temperatures, measure polariton frequencies as a function of magnetic field in different scenarios. When only one resonator within a pair hosts a molecular sample, the results evidence that spins couple remotely to the empty LER as well as to the local cavity mode. If both resonators interact with a spin ensemble, the magnetic field tunes the polariton frequencies relative to each other, on account of the different spin-photon interactions at each LER. When polaritons are brought into mutual resonance, an avoided level crossing emerges that gives direct spectroscopic evidence for a coherent polariton-polariton interaction mediated by the circuit. Pump-probe experiments reveal that the excitation of a polariton within a connected pair is felt, thus it can be read out, by the other one. These observations, backed by model calculations, illustrate the control and detection of distant photon-photon and spin-spin correlations and entanglement in a scalable modular chip. Comments: Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2602.18103 [quant-ph] (or arXiv:2602.18103v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2602.18103 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Fernando Luis [view email] [v1] Fri, 20 Feb 2026 09:48:07 UTC (9,936 KB) Full-text links: Access Paper: View a PDF of the paper titled Polariton-polariton coherent coupling in a molecular spin-superconductor chip, by Carolina del R\'io (1) and 37 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-02 Change to browse by: cond-mat cond-mat.mes-hall References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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