Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Quantum correlated light beams from cascade four-wave mixing in cold atoms

Jul 21, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Quantum optics and hybrid quantum systems Poster session


Optical parametric amplifiers are known in the literature as a tool for the generation of quantum correlated beams. Forward four-wave mixing (FWM) with gain factors on the order of 10 associated with strong intensity squeezing [1] is behind, for example, the generation of entangled fields [2].

In this work, we explore both the internal and external atomic degrees of freedom to demonstrate the observation of giant gain and parametric oscillation in multiple FWM processes in a sample of cold cesium atoms. The parametric probe-beam amplification exceeds 2000 and is accompanied by the generation of three other beams of equivalent power emitted along the directions satisfying the phase-matching conditions for multiple cascade forward and backward FWM [3, 4].

The quantum correlations among these fields are investigated by combining in-quadrature electronic local oscillators and heterodyne detection, allowing the measurement of the fields' quadratures and the reconstruction of the covariance matrix.

Also, a full Liouville–Maxwell equations calculation in the extended Hilbert space of the internal and external atomic degrees of freedom allows us to obtain, from first principles, the four-wave propagation equations.

[1] C. F. McCormick, A. M. Marino,V.Boyer, and P. D. Lett, Phys. Rev. A 78, 043816 (2008).
[2] V. Boyer, A. M. Marino, R. C. Pooser, and P. D. Lett, Science 321 321, 544 (2008).
[3] J. P. Lopez, A. J. F. de Almeida, D. Felinto, and J. W. R. Tabosa, Opt. Lett. 42, 4474 (2017).
[4] J. P. Lopez, A. M. G. de Melo, and J. W. R. Tabosa, Opt. Lett. , 45, 3490 (2020).

Presenter name Gabriel C. Borba
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Primary authors

Dr Gabriel C. Borba (Universidade de São Paulo) Dr Raoni S. N. Moreira (Universidade Federal de Pernambuco) Prof. Marcelo Martinelli (Universidade de São Paulo) Prof. Daniel Felinto (Universidade Federal de Pernambuco) Prof. José W. R. Tabosa (Universidade Federal de Pernambuco)

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