89585 20210902121628.0 doi 10.1103/PhysRevA.101.053818 sideral 117609 ART-2020-117609 eng Macri, V. Spin squeezing by one-photon-two-atom excitation processes in atomic ensembles 2020 Access copy available to the general public Unrestricted It has been shown elsewhere that two spatially separated atoms can jointly absorb one photon, whose frequency is equal to the sum of the transition frequencies of the two atoms. We describe this process in the presence of an ensemble of many two-level atoms and show that it can be used to generate spin squeezing and entanglement. This resonant collective process allows us to create a sizable squeezing already at the single-photon limit. It represents a way to generate many-body spin-spin interactions, yielding a two-axis twisting-like interaction among the spins, which is very efficient for the generation of spin squeezing. We perform explicit calculations for ensembles of magnetic molecules coupled to a superconducting coplanar cavities. This system represents an attractive on-chip architecture for the realization of improved sensing. info:eu-repo/grantAgreement/ES/DGA/Q-MAD info:eu-repo/grantAgreement/ES/MCIU/MAT2017-88358-C3-1-R info:eu-repo/grantAgreement/EUR/QUANTERA/SUMO info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.14 2020 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL 10 / 37 = 0.27 2020 Q2 T1 OPTICS 31 / 99 = 0.313 2020 Q2 T1 1.391 2020 Atomic and Molecular Physics, and Optics 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Nori, F. Savasta, S. Zueco, D. Universidad de Zaragoza (orcid)0000-0003-4478-1948 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 101, 5 (2020), 053818 [13 pp] Phys. rev., A Physical Review A 2469-9926 3739263 http://zaguan.unizar.es/record/89585/files/texto_completo.pdf Versión publicada 641422 http://zaguan.unizar.es/record/89585/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:89585 articulos driver 2021-09-02-08:51:26 ARTICLE