| Full text | |
| Author(s): |
Marinho, Lucas S.
;
Araujo, Michelle O.
;
Martins, Wellington
;
Fleinto, Daniel
Total Authors: 4
|
| Document type: | Journal article |
| Source: | OPTICS LETTERS; v. 48, n. 12, p. 4-pg., 2023-06-15. |
| Abstract | |
We report the enhancement of quantum correlations for biphotons generated via spontaneous four-wave mixing in an ensemble of cold two-level atoms. This enhancement is based on the filtering of the Rayleigh linear compo-nent of the spectrum of the two emitted photons, favoring the quantum-correlated sidebands reaching the detectors. We provide direct measurements of the unfiltered spec-trum presenting its usual triplet structure, with Rayleigh central components accompanied by two peaks symmetri-cally located at the detuning of the excitation laser with respect to the atomic resonance. The filtering of the central component results in a violation of the Cauchy-Schwarz inequality to (4.8 & PLUSMN; 1.0) & NLE; 1 for a detuning of 60 times the atomic linewidth, representing an enhancement by a factor of four compared with the unfiltered quantum correlations observed at the same conditions. & COPY; 2023 Optica Publishing Group (AU) | |
| FAPESP's process: | 21/06535-0 - Quantum internet with atomic memories |
| Grantee: | Daniel Felinto Pires Barbosa |
| Support Opportunities: | Research Projects - Thematic Grants |