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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Quantum Noise Correlations of an Optical Parametric Oscillator Based on a Nondegenerate Four Wave Mixing Process in Hot Alkali Atoms

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Guerrero, A. Montana [1] ; Nussenzveig, P. [1] ; Martinelli, M. [1] ; Marino, A. M. [2, 3] ; Florez, H. M. [1]
Total Authors: 5
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
[2] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 - USA
[3] Univ Oklahoma, Ctr Quantum Res & Technol, Norman, OK 73019 - USA
Total Affiliations: 3
Document type: Journal article
Source: Physical Review Letters; v. 125, n. 8 AUG 21 2020.
Web of Science Citations: 1

We present the first measurement of two-mode squeezing between the twin beams produced by a doubly resonant optical parameter oscillator (OPO) in an above threshold operation based on parametric amplification by nondegenerate four wave mixing with rubidium (Rb-85). We demonstrate a maximum intensity difference squeezing of -2.7 dB (-3.5 dB corrected for losses) with a pump power of 285 mW and an output power of 12 mW for each beam, operating close to the D1 line of Rb atoms. The use of open cavities combined with the high gain media can provide a strong level of noise compression and the access to new operation regimes that could not be explored by crystal based OPOs. The spectral bandwidth of the squeezed light is broadened by the cavity dynamics, and the squeezing level is robust for strong pump powers. Stable operation was obtained up to 4 times above the threshold. Moreover, operation of the OPO close to the atomic resonances of alkali atoms allows a natural integration into quantum networks, including structures such as quantum memories. (AU)

FAPESP's process: 18/03155-9 - Implementing four wave mixing technology for entanglement networks, magnetometry and to explore quantum thermodynamics
Grantee:Hans Marin Florez
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/27216-4 - Studying the quantum state of the field at the threshold of the optical parametric oscillator
Grantee:Alvaro Montaña Guerrero
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 15/18834-0 - Exploring quantum information with atoms, crystals and chips
Grantee:Marcelo Martinelli
Support Opportunities: Research Projects - Thematic Grants