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Entanglement by four wave mixing in atomic media

Grant number: 18/20159-8
Support type:Regular Research Grants
Duration: April 01, 2019 - March 31, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Cooperation agreement: FACEPE
Principal Investigator:Marcelo Martinelli
Grantee:Marcelo Martinelli
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Assoc. researchers: José Wellington Rocha Tabosa ; Luciano Soares da Cruz ; Paulo Alberto Nussenzveig


Parametric amplification is a powerful tool for the generation of entangled and squeezed states of the electromagnetic field. A revival of the interest for these states came on the last decade thanks to their potential applications in quantum information, with the use of cluster states for information processing.On the other hand, high levels of squeezing are on the verge of their application on the next run of the gravitational wave detector (LIGO collaboration), setting new goals for the generation and application of those states of the field.On this situation, the use of third order nonlinearities in four wave mixing process (4WM) allows the building of parametric amplifiers with very high gain, using optical field close to resonances of atomic media. Our laboratories are investigating the generation of entangled states in cold atoms, showing extreme gain ($>10^3$) for parametric amplification in a Cesium cloud, while extending this entanglement to four fields involved in this process. At USP, we are investigating entanglement in multiple fields coupled by hot rubidium vapors. At UFABC, the ultimate limit for squeezing with polarization self rotation are being achieved.This proposal involves the use of the complementary knowledge of the involved groups, exploring the different possibilities in quantum information, combining the knowledge of high control of atomic systems developed by the group at UFPE with the measurement techniques of the optical field developed in São Paulo. (AU)