Advanced Quantum Noise
Ulrich Vogl, Ryan T. Glasser, Jeremy B. Clark, Quentin Glorieux, Tian, Li, Neil V. Corzo, and Paul D. Lett

TL;DR
This paper demonstrates the first advancement of a bright nonclassical light state using twin-beams in a medium with anomalous dispersion, revealing quantum correlation degradation near the quantum limit.
Contribution
It introduces a novel experimental setup employing four-wave mixing in rubidium vapor to advance nonclassical light while preserving quantum correlations.
Findings
Successful advancement of bright nonclassical twin-beams.
Quantum correlations degrade near the fundamental quantum limit.
First demonstration of nonclassical state advancement in anomalous dispersion media.
Abstract
We use the quantum correlations of twin-beams of light to probe the added noise when one of the beams propagates through a medium with anomalous dispersion. The experiment is based on two successive four-wave mixing processes in rubidium vapor, which allow for the generation of bright two-mode-squeezed twin-beams followed by a controlled advancement while maintaining the shared quantum-correlations between the beams. The demonstrated effect allows the study of irreversible decoherence in a medium exhibiting anomalous dispersion, and for the first time shows the advancement of a bright nonclassical state of light. The advancement and corresponding degradation of the quantum correlations are found to be operating near the fundamental quantum limit imposed by using a phase-insensitive amplifier.
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Taxonomy
TopicsQuantum optics and atomic interactions · Cold Atom Physics and Bose-Einstein Condensates · Spectroscopy and Quantum Chemical Studies
