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Research Produces Intense Light Beams with Quantum Correlations Having Potential Applications High-Precision Metrology and Information Encoding

By IQT News posted 18 Nov 2020

(EurekaAlert) Both crystals and atomic vapors can be used to produce quantum correlated pairs of light beams. Investigating the behavior of these sources is a challenge. The behavior of light below a certain level of power resembles that of the light produced by a bulb. Above a certain threshold, its characteristics are similar to those of a laser.
The use of atomic vapors has been considered a more efficient alternative that enhances the accessibility of non-classical light states. “We show that oscillators based on these atomic amplifiers can generate intense beams of light with quantum correlations,” Marcelo Martinelli, a researcher in the University of São Paulo’s Physics Institute (IF-USP), told Agência FAPESP. Martinelli is a co-author of an article published in Physical Review Letters describing the main results to date of a Thematic Project for which he is the principal investigator.
“This offered two advantages in comparison with the old crystal-based cavities – more quantum efficiency so that the number of photons supplied by the output window easily surpassed the number of photons lost to the environment, and a chance to investigate more subtle details of the transition between light with heterogeneous frequencies and the production of intense laser-like beams. It was as if we had opened a window on to the quantum dynamics of the phase transition,” Martinelli said.
Potential applications include high-precision metrology with manipulation of the quantum noise in light and information encoding via quantum entanglement.

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