http://10.100.206.202:8080/handle/item/200 2026-08-05T04:46:49Z 2026-08-05T04:46:49Z Luís Nery Garcia, Breno Veiga dos Santos, Marcos http://10.100.206.202:8080/handle/item/871 2026-08-03T10:26:06Z 2026-08-03T07:26:02Z

Comparison of rapid direct in vitro antimicrobial susceptibility testing and agar disk diffusion for bovine mastitis pathogens Luís Nery Garcia, Breno; Veiga dos Santos, Marcos Contém dados referente aos testes de suscetibilidade aos antimicrobianos de Staphylococcus aureus, Staphylococcus chromogenes, Streptococcus uberis, Escherichia coli e Klebsiella spp. isolados de mastite bovina.

2026-08-03T07:26:02Z Rincón Celis, Raul Leonardo Martinelli, Marcelo http://10.100.206.202:8080/handle/item/870 2026-08-03T10:25:29Z 2026-08-03T07:25:29Z

Uncovering hidden entanglement in twin beams Rincón Celis, Raul Leonardo; Martinelli, Marcelo Data regarding the proper characterization of quantum correlations in multimode optical quantum states. This is critical for applications in quantum information science. However, standard entanglement measurements can lead to incomplete state reconstruction and characterization. Here, we implement a resonator-based detection system that reveals entanglement between sideband modes of twin beams, achieving full tomography and retrieving often ignored quantum correlations. Unlike standard spectral measurements such as homodyne detection, resonator detection can independently address the sidebands of each beam, thereby accessing these hidden correlations. Additionally, we show how phase shifts between the carrier and the sideband modes of the involved fields redistribute information and modify the observation of entanglement for different witnesses. The ability of the resonant detection to independently address sideband modes of entangled states can contribute to enhancing the capacity for secure communication and quantum networking protocols.

2026-08-03T07:25:29Z Borba, Gabriel Cruz Martinelli, Marcelo Felinto, Daniel Tabosa, José Wellington http://10.100.206.202:8080/handle/item/869 2026-08-03T10:25:06Z 2026-08-03T07:25:05Z

Continuous variable entanglement in a cold-atom mirrorless optical parametric oscillator Borba, Gabriel Cruz; Martinelli, Marcelo; Felinto, Daniel; Tabosa, José Wellington This dataset explores both the internal and external atomic degrees of freedom to observe quantum entanglement between the modes produced by a mirrorless optical parametric oscillator operating below the oscillation threshold in a sample of free-space cold cesium atoms. Using a new heterodyne technique, we recover the covariance matrix that reveals the quantum entanglement for two different pairs of modes, thus demonstrating the generation of four entangled modes in this system. Applications to quantum networks and the possibilities of studying higher orders of entanglement are a direct consequence of the present study.

2026-08-03T07:25:05Z Martinelli, Marcelo http://10.100.206.202:8080/handle/item/868 2026-07-27T21:22:41Z 2026-07-27T18:22:38Z

Quantum Information with Continuous Variables Martinelli, Marcelo Fapesp Project 2022/09436-5 - After reaching 26 years of contributions in quantum optics and atomic physics, our group has gathered resources and expertise to follow the efforts in these research areas in their applications in quantum information and extreme measurements. Our present proposal will therefore stretch over different subjects in the field. We will investigate the creation of quantum entangled networks in continuous variables, using the parametric process of four wave mixing in atomic vapors, with applications in quantum computing using cluster states. Another subject will explore the ability to connect fields of distinct frequencies, separated by more than one octave, using teleportation protocols for non-classical states of the field (allowing the transfer of "qubits"). The goal here is to couple atomic lines to the telecommunication band in optical fibers by unconditional teleportation. We will investigate the behavior of parametric oscillators close to the oscillation threshold, exploring this phase transition by returning to the fundamentals of quantum optics to investigate the light produced in this condition. We will continue with the development of scalable sources of entangled states, using Si or Si$_3$N$_4$ microchips. We will begin the development of applications of X-ray photon correlation, aiming to use the high luminosity lines from the Sirius laboratory to implement high spatial resolution systems, with high energy photons, but in a minimum fluence regime to minimize damage to the samples under analysis. Finally, we will investigate the implementations of "bit commitment" proofs of principle, linking experiments to investigations of fundamental questions in quantum information.

2026-07-27T18:22:38Z