Polariton-polariton coherent coupling in a molecular spin-superconductor chip
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | del Río, Carolina Rubín-Osanz, Marcos Rodriguez, David Roca-Jerat, Sebastián Pallarés, María Carmen de Sousa, J. Alejandro Pakulski, Paweł Palacios, José Luis García Granados, Daniel Pinkowicz, Dawid Crivillers, Núria Lostao, Anabel Zueco, David Gomez, Alicia Luis, Fernando |
| author_facet | del Río, Carolina Rubín-Osanz, Marcos Rodriguez, David Roca-Jerat, Sebastián Pallarés, María Carmen de Sousa, J. Alejandro Pakulski, Paweł Palacios, José Luis García Granados, Daniel Pinkowicz, Dawid Crivillers, Núria Lostao, Anabel Zueco, David Gomez, Alicia Luis, Fernando |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_18103 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Polariton-polariton coherent coupling in a molecular spin-superconductor chip del Río, Carolina Rubín-Osanz, Marcos Rodriguez, David Roca-Jerat, Sebastián Pallarés, María Carmen de Sousa, J. Alejandro Pakulski, Paweł Palacios, José Luis García Granados, Daniel Pinkowicz, Dawid Crivillers, Núria Lostao, Anabel Zueco, David Gomez, Alicia Luis, Fernando Quantum Physics Mesoscale and Nanoscale Physics 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. |
| title | Polariton-polariton coherent coupling in a molecular spin-superconductor chip |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.18103 |